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  • Artikel  (235)
  • heavy metals  (118)
  • agriculture  (63)
  • environment  (58)
  • Energietechnik  (235)
  • 1
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    International Journal of Radiation Applications & Instrumentation. Part C, 31 (1988), S. 57-82 
    ISSN: 1359-0197
    Schlagwort(e): Pollution control ; coal ; electric utility ; electron beam ; environment ; nitrogen dioxide ; nitrogen oxides ; sulfur dioxide ; sulfur dioxide ; test plant ; test results
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie , Energietechnik , Physik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Environmental Pollution 83 (1994), S. 341-349 
    ISSN: 0269-7491
    Schlagwort(e): Antarctica ; distribution ; heavy metals ; inter-metal correlation ; seals
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Energietechnik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Environmental Pollution 83 (1994), S. 95-111 
    ISSN: 0269-7491
    Schlagwort(e): acidification ; agriculture ; climate change ; eutrophication ; greenhouse gases
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Energietechnik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Environmental Pollution 84 (1994), S. 131-138 
    ISSN: 0269-7491
    Schlagwort(e): air pollution ; bioindicators ; element ratios ; geochemical relations ; heavy metals
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Energietechnik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Environmental Pollution 86 (1994), S. 83-88 
    ISSN: 0269-7491
    Schlagwort(e): Manila Bay ; heavy metals ; historical trend of pollution ; marine sediment ; riverine sediment
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Energietechnik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Risk analysis 18 (1998), S. 563-573 
    ISSN: 1539-6924
    Schlagwort(e): Risk assessment ; mourning doves ; hunting ; radionuclides ; heavy metals ; lead shot ; cesium
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract Recreational and subsistence hunters and anglers consume a wide range of species, including birds, mammals, fish and shellfish, some of which represent significant exposure pathways for environmental toxic agents. This study focuses on the Department of Energy's (DOE's) Savannah River Site (SRS), a former nuclear weapons production facility in South Carolina. The potential risk of contaminant intake from consuming mourning doves (Zenaida macroura), the most popular United States game bird, was examined under various risk scenarios. For all of these scenarios we used the mean tissue concentration of six metals (lead, mercury, cadmium, selenium, chromium, manganese) and radiocesium, in doves collected on and near SRS. We also estimated risk to a child consuming doves that had the maximum contaminant level. We used the cancer slope factor for radiocesium, the Environmental Protection Agencies Uptake/Biokinetic model for lead, and published reference doses for the other metals. As a result of our risk assessments we recommend management of water levels in contaminated reservoirs so that lake bed sediments are not exposed to use by gamebirds and other terrestrial wildlife. Particularly, measures should be taken to insure that the hunting public does not have access to such a site. Our data also indicate that doves on popular hunting areas are exposed to excess lead, suggesting that banning lead shot for doves, as has been done for waterfowl, is desirable.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Risk analysis 19 (1999), S. 159-169 
    ISSN: 1539-6924
    Schlagwort(e): Trust ; geography ; personality ; environment
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract A sample of 323 residents of New Jersey stratified by neighborhood quality (excellent, good, fair, poor) was gathered to determine if trust in science and technology to protect public health and environment at the societal scale was associated with trust of the local officials, such as the mayor, health officer, developers, mass media, and legislators who are guardians of the local environment. Societal (trust of science and technology) and neighborhood (mayor, health officer) dimensions of trust were found. These societal and neighborhood trust dimensions were weakly correlated. Respondents were divided into four trust-of-authority groups: high societal–high neighborhood, low societal–low neighborhood, high societal–low neighborhood, and low societal–high neighborhood. High societal–high neighborhood trust respondents were older, had lived in the neighborhoods for many years, were not troubled much by neighborhood or societal environmental threats, and had a strong sense of control over their environment. In strong contrast, low societal–low neighborhood trust respondents were relatively young, typically had lived in their present neighborhood for a short time, were troubled by numerous neighborhood and societal environmental threats, did not practice many personal public health practices, and felt little control over their environment.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Radiation Physics and Chemistry 25 (1985), S. 35-45 
    ISSN: 0146-5724
    Schlagwort(e): NO"x ; Pollution control ; SO"2 ; coal ; electric utility ; electron beam ; environment ; nitrogen oxides ; sulfur dioxide
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie , Energietechnik , Physik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Radiation Physics and Chemistry 24 (1984), S. 3-16 
    ISSN: 0146-5724
    Schlagwort(e): Sewage sludge ; agriculture ; cost calculation ; hygienic effect ; technical experiences ; γ-irradiation
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie , Energietechnik , Physik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Radiation Physics and Chemistry 25 (1985), S. 1-10 
    ISSN: 0146-5724
    Schlagwort(e): Irradiation ; agriculture ; agronomics ; animal nutrition ; cesium-137 ; costs ; design ; disinfection ; land application ; pathogens ; resource recovery ; sludge ; sludge reuse
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie , Energietechnik , Physik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 11
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Radiation Physics and Chemistry 22 (1983), S. 91-97 
    ISSN: 0146-5724
    Schlagwort(e): Radiation ; composting ; disinfection ; electron beam ; environment ; exhaust gases ; gamma rays ; nitrogen oxides ; pathogens ; sewage sludge ; sulfur dioxied ; viruses ; waste water
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie , Energietechnik , Physik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 12
    Digitale Medien
    Digitale Medien
    Springer
    Biodegradation 3 (1992), S. 161-170 
    ISSN: 1572-9729
    Schlagwort(e): bioremediation ; cadmium ; heavy metals
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract Cadmium pollution arises mainly from contamination of minerals used in agriculture and from industrial processes. The usual situation is of large volumes of soil and water that are contaminated with low — but significant — concentrations of cadmium. Therefore, detoxification of the polluted water and soil involves the concentration of the metal, or binding it in a way that makes it biologically inert. Cadmium is one of the more toxic metals, that is also carcinogenic and teratogenic. Its effects are short term, even acute (diseases like Itai-itai), or long term. The long term effects are intensified due to the fact that cadmium accumulates in the body. This paper describes a study involving several hundred cadmium-resistant bacterial isolates. These bacteria could be divided into three groups—the largest group consisted of bacteria resistant to cadmium by effluxing it from the cells. The bacteria of the other two groups were capable of binding cadmium or of detoxifying it. We concentrated on one strain that could bind cadmium very efficiently, depending on the bacterial biomass and on the pH. This strain could effectively remove cadmium from contaminated water and soil.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 13
    Digitale Medien
    Digitale Medien
    Springer
    Natural hazards 6 (1992), S. 109-129 
    ISSN: 1573-0840
    Schlagwort(e): Drought ; agriculture ; hydrology ; monitoring ; research
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Geographie , Geologie und Paläontologie
    Notizen: Abstract The 1988 drought conditions, which prevailed over the southern portion of the Canadian prairie provinces, resulted in severe impacts on agriculture, water resources, forestry, and waterfowl production. In this paper, the climatological aspects of the drought are reviewed and the impacts of the drought are described. In addition, a number of the environmental factors that may have aggravated the drought's impacts are discussed. Processes contributing to the 1988 drought are considered in terms of their scales, relative importance and possible effects. It was evident from the information needs of government agencies and private businesses which had to cope with the effects of the 1988 drought, that studies are needed to effectively monitor drought and adjust to its impacts. In this paper, these needs are discussed; several specific hypotheses concerning drought-related processes are advanced and a framework for addressing the scientific aspects of droughts on the Canadian prairies is proposed. It is anticipated that many of these identified research needs and opportunities are applicable to other drought-prone areas of the world.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 14
    Digitale Medien
    Digitale Medien
    Springer
    Journal of fusion energy 16 (1997), S. 245-251 
    ISSN: 1572-9591
    Schlagwort(e): Fusion ; safety ; environment ; accidents ; waste
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract The SEAFP (Safety and Environmental Assessment of Fusion Power) and SEAL (Safety and Environmental Assessment of fusion power, Long-term) programs form part of the ongoing effort in the European Fusion Programme to consider the safety and environmental aspects of fusion power. SEAFP was undertaken in the period 1992–1994. The assessment started with the development of two conceptual power plant designs, each of 3000 MW of fusion power, termed Model 1 and Model 2. Model 1 used vanadium alloy, helium cooling, and lithium oxide for tritium generation. Model 2 used a reduced-activation martensitic steel, water cooling, and a lithium–lead alloy for tritium generation. Both Models were designed for passive safety. The SEAFP analyses included detailed consideration of effluents, occupational doses, accidents (concentrating on the worst possible accidents), and waste management. The key results are summarized in this paper. SEAL was launched in 1995, with the aims of broadening the scope of SEAFP, and of elaborating selected aspects of SEAFP in more detail. The SEAL analyses include studies which extend the results of SEAFP to a wider class of blanket designs and material choices, improved assessments of the quantities of activated materials which may be exempted from regulatory control or recycled, improved modeling of occupational doses, and work in many areas to improve relevant data, modeling and analyses, or consider design improvements. Much of this work is ongoing, but key results from completed work are summarized in this paper.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 15
    Digitale Medien
    Digitale Medien
    Springer
    Journal of fusion energy 12 (1993), S. 145-148 
    ISSN: 1572-9591
    Schlagwort(e): tritium ; transport ; monitoring ; environment ; model ; validation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract Environmental tritium concentrations will be measured near the Tokamak Fusion Test Reactor (TFTR) to help validate dynamic models of tritium transport in the environment. For model validation the database must contain sequential measurements of tritium concentrations in key environmental compartments. Since complete containment of tritium is an operational goal, the supplementary monitoring program should be able to glean useful data from an unscheduled acute release. Portable air samplers will be used to take samples automatically every 4 hours for a week after an acute release, thus obtaining the time resolution needed for code validation. Samples of soil, vegetation, and foodstuffs will be gathered daily at the same locations as the active air monitors. The database may help validate the plant/soil/air part of tritium transport models and enhance environmental tritium transport understanding for the International Thermonuclear Experimental Reactor (ITER).
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 16
    Digitale Medien
    Digitale Medien
    Springer
    Journal of fusion energy 12 (1993), S. 149-156 
    ISSN: 1572-9591
    Schlagwort(e): environment ; tritium ; activation products ; dose calculations ; NET, ITER
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract In view of public acceptance and the licensing procedure of projected fusion reactors, the release of tritium and activation products during normal operation as well as after accidents is a significant safety aspect. Calculations have been performed under accidental conditions for unit releases of corrosion products from water coolant loops, of first wall erosion products including different coating materials, and of tritium in its chemical form of tritiated water (HTO). Dose assessments during normal operation have been performed for corrosion products from first wall primary coolant loop and for tritium in both chemical forms (HT/HTO). The two accident consequence assessment (ACA) codes UFOTRI and COSYMA have been applied for the deterministic dose calculations with nearly the same input variables and for several radiological source terms. Furthermore, COSYMA and NORMTRI have been applied for routine release scenarios. The paper analyzes the radioation doses to individuals and the population resulting from the different materials assumed to be released in the environment.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 17
    ISSN: 1572-9729
    Schlagwort(e): acid mine drainage ; algae ; heavy metals ; high rate algal ponds ; sulphate reducing bacteria ; waste stabilisation ponds
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract Acid mine drainage pollution may be associated with large water volume flows and exceptionally long periods of time over which the drainage may require treatment. While the use and role of sulphate reducing bacteria has been demonstrated in active treatment systems for acid mine drainage remediation, reactor size requirement and the cost and availability of the carbon and electron donor source are factors which constrain process development. Little attention has focussed on the use of waste stabilisation ponding processes for acid mine drainage treatment. Wastewater ponding is a mature technology for the treatment of large water volumes and its use as a basis for appropriate reactor design for acid mine drainage treatment is described including high rates of sulphate reduction and the precipitation of metal sulphides. Together with the co-disposal of organic wastes, algal biomass is generated as an independent carbon source for SRB production. Treatment of tannery effluent in a custom-designed high rate algal ponding process, and its use as a carbon source in the generation and precipitation of metal sulphides, has been demonstrated through piloting to the implementation of a full-scale process.The treatment of both mine drainage and zinc refinery wastewaters are reported. A complementary role for microalgal production in the generation of alkalinity and bioadsorptive removal of metals has been utilised and an Integrated 'Algal Sulphate Reducing Ponding Process for the Treatment of Acidic and Metal Wastewaters' (ASPAM) has been described.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 18
    Digitale Medien
    Digitale Medien
    Springer
    Biodegradation 9 (1998), S. 311-318 
    ISSN: 1572-9729
    Schlagwort(e): glucosinolates ; gypsum ; heavy metals ; phyto-extraction ; phytoremediation ; sulfate
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract Sulfur is a major nutrient for all organisms. Plant species have a high biodiversity in uptake, metabolization and accumulation of sulfur so that there are potentials to use plants for phytoremediation of sulfur-enriched sites. A survey of soils enriched with sulfur either naturally or by human activities shows that a surplus of sulfur is mostly accompanied with a surplus of other chemical elements which may limit phytoremediation because these co-occurring elements are more toxic to plants than sulfur. In addition, the accumulation of the other elements makes the plant material (phyto-extraction) less suitable for the use as fodder and for human consumption.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 19
    Digitale Medien
    Digitale Medien
    Springer
    Biodegradation 9 (1998), S. 411-422 
    ISSN: 1572-9729
    Schlagwort(e): agrochemicals ; heavy metals ; NMR imaging ; NMR spectroscopy ; subcellular compartmentation xenobiotic metabolism
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract The application of non-invasive nuclear magnetic resonance (NMR) methods in xenobiotic research is reviewed in relation to: (i) the characterisation of the effects of xenobiotics on the metabolism of plants and plant cell suspensions; (ii) the direct detection of xenobiotics and their degradation products in vivo; and (iii) the spatial localisation of xenobiotics and their derivatives at the subcellular and tissue levels. Novel information has been generated by in vivo NMR studies of both agrochemicals and heavy metals, but a lack of generality in the methods makes it difficult to extrapolate from one successful application to the next. In vivo NMR spectroscopy is shown to be informative when a xenobiotic perturbs metabolic pathways that are accessible to the technique, and it is useful for probing the partitioning of paramagnetic metal ions between the cytoplasm and the vacuole. The successful application of 19F NMR to the analysis of plant tissue extracts also suggests that in vivo 19F NMR spectroscopy may have a role in biotransformation studies of fluorinated xenobiotics. In contrast NMR imaging techniques have been little used for xenobiotic research in plants, and while the method has been shown to be capable of monitoring the uptake and translocation of paramagnetic ions in plants, the potential use of high resolution 1H and 19F NMR imaging for mapping agrochemicals in tissues is still in its infancy.
    Materialart: Digitale Medien
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  • 20
    ISSN: 1572-9729
    Schlagwort(e): automation ; environment ; fingerprinting ; GLP ; LC ; NMR ; statistics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract An off-line combination of 400 MHz proton (1H)-NMR spectroscopy and liquid chromatography (LC) has been used for the multi-component comparison of low-molecular weight compounds (i.e., chemical fingerprinting) in model fluid broths and (processed) tomato. The focus of the research described is on (i) devising GLP-like methods for sample handling and NMR measurements that will ensure reproducibility, (ii) an automated handling of data, (iii) validity of the designed methodology and (iv) the interpretation of large amounts of data.
    Materialart: Digitale Medien
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  • 21
    ISSN: 1572-9729
    Schlagwort(e): bioremediation ; heavy metals ; metal availability ; organic matter ; pyrite ; sulphide oxidation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract A field experiment, lasting 14 months, was carried out in order to assess the effect of organic amendment and lime addition on the bioavailability of heavy metals in contaminated soils. The experiment took place in a soil affected by acid, highly toxic pyritic waste from the Aznalcóllar mine (Seville, Spain) in April 1998. The following treatments were applied (3 plots per treatment): cow manure, a mature compost, lime (to plots having pH 〈 4), and control without amendment. During the study two crops of Brassica juncea were grown, with two additions of each organic amendment. Throughout the study, the evolution of soil pH, total and available (DTPA-extractable) heavy metals content (Zn, Cu, Mn, Fe, Pb and Cd), electrical conductivity (EC), soluble sulphates and plant growth and heavy metal uptake were followed. The study indicates that: (1) soil acidification, due to the oxidation of metallic sulphides in the soil, increased heavy metal bioavailability; (2) liming succeeded in controlling the soil acidification; and (3) the organic materials generally promoted fixation of heavy metals in non-available soil fractions, with Cu bioavailability being particularly affected by the organic treatments.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 22
    ISSN: 1573-1502
    Schlagwort(e): economics ; environment ; natural resources ; research
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Wirtschaftswissenschaften
    Notizen: Abstract The research questions and topics most likely to emerge in the near term future are assessed. A common theme is that policy issues will be an important driving force, as has generally been true in the past. More specifically, future theoretical advances are expected to occur in the treatment of uncertainty, the incorporation of stock service flows into natural resource analysis, and the incorporation of institutional considerations into models of resource exploitation. Research on valuation is expected to remain vigorous, primarily in the testing of basic assumptions and reconciliation of existing inconsistencies. Opportunities in renewable resource economics center on the incorporation of richer behavioral and technological detail in the general frameworks that already exist. A better understanding of what drives technology, and how environmental agreements can be negotiated and enforced among sovereign nations, are two topics likely to shape future research on global externalities. Finally, questions related to spatial aspects of natural resource use, and matters of land use more generally, seem likely to emerge as important topics on the profession's future research agenda.
    Materialart: Digitale Medien
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  • 23
    Digitale Medien
    Digitale Medien
    Springer
    Environmental and resource economics 11 (1998), S. 335-348 
    ISSN: 1573-1502
    Schlagwort(e): environment ; external costs ; policy, transport
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Wirtschaftswissenschaften
    Notizen: Abstract During the last decade much progress has been made in defining & measuring the external costs of transport. As the cost of tolling equipment falls, the set of realistic policy options to internalise these externalities will continue to grow. This will determine the research and policy agenda. We make three points. Firstly, empirical work is still necessary to better identify marginal external costs, including congestion, accident and environmental costs. Secondly, any assessment of policy options should treat externalities simultaneously. The use of pricing instruments and emissions standards are discussed within this framework. Thirdly, we emphasise the role of government. Designing the optimal road-pricing institutions requires consideration of horizontal and vertical tax competition, while double-dividend arguments are central to the question of securing public support.
    Materialart: Digitale Medien
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  • 24
    Digitale Medien
    Digitale Medien
    Springer
    Mitigation and adaptation strategies for global change 1 (1996), S. 139-165 
    ISSN: 1573-1596
    Schlagwort(e): Adaptation ; agriculture ; agroforestry ; climate change ; drought ; ecological degradation ; factor bias ; Senegal ; sustainability ; social relations
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Geographie
    Notizen: Abstract The ongoing drought in the Sahel region of West Africa highlights the vulnerability of food-producing systems to climate change and variability. Adaptation to climate should therefore increase the sustainability of agriculture under a long-term drought. Progress towards sustainability and adaptation in the the Senegal River Basin is hampered by an existing set of social and ecological relationships that define the control over the means of production and how people interact with their environment. These relationships are sensitive to the technological inputs and the administration of food production, or the factor bias in the different policy alternatives for rural development. One option is based on state-controlled, irrigated plantations to provide rice (Oryza) for the capital, Dakar. This policy emphasizes a top-down management approach, mechanized agriculture and a reliance on external inputs which strengthens the relationships introduced during the colonial period. A time series decomposition of the annual flow in the Senegal River at Bakel in Senegal suggests that water resources availability has been substantially curtailed since 1960, and a review of the water resources budget or availability in the basin suggests that this policy's food production system is not sustainable under the current climate of the basin. Under these conditions, this program is exacerbating existing problems of landscape degradation and desertification, which increases rural poverty. A natural resource management policy offers two adaptation strategies that favour decentralized management and a reduction of external inputs. The first alternative, “Les Perimetres Irrigués”, emphasizes village-scale irrigation, low water consumption cereal crops and traditional socio-political structures. The second alternative emphasizes farm-level irrigation and agro-forestry projects to redress the primary effects of desertification. The water requirements of both the rice import substitution program and the natural resource management program are calculated. A water resources simulation model/optimization analysis using dynamic programming is used to compare these two alternatives to the rice import substitution programs. Results indicate that the natural resource management policy could potentially bring a large area into production while using far less water than the rice import substitution program. The natural resource management policy, in particular the second alternative with its emphasis on individual ownership and ecological rehabiliation, defines a different set of social and ecological relationships that appear to enhance the sustainability of food production under a long-term drought.
    Materialart: Digitale Medien
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  • 25
    Digitale Medien
    Digitale Medien
    Springer
    Mitigation and adaptation strategies for global change 2 (1997), S. 19-44 
    ISSN: 1573-1596
    Schlagwort(e): adaptation ; Africa ; agriculture ; climate change ; vulnerability ; water
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Geographie
    Notizen: Abstract The intersection of present vulnerability and the prospect of climate change in Africa warrants proactive action now to reduce the risk of large-scale, adverse impacts. The process of planning adaptive strategies requires a systematic evaluation of priorities and constraints, and the involvement of stakeholders. An overview of climate change in Africa and case studies of impacts for agriculture and water underlie discussion of a typology of adaptive responses that may be most effective for different stakeholders. The most effective strategies are likely to be to reduce present vulnerability and to enhance a broad spectrum of capacity in responding to environmental, resource and economic perturbations. In some cases, such as design of water systems, an added risk factor should be considered.
    Materialart: Digitale Medien
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  • 26
    Digitale Medien
    Digitale Medien
    Springer
    Mitigation and adaptation strategies for global change 2 (1997), S. 19-44 
    ISSN: 1573-1596
    Schlagwort(e): adaptation ; Africa ; agriculture ; climate change ; vulnerability ; water
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Geographie
    Notizen: Abstract The intersection of present vulnerability and the prospect of climate change in Africa warrants proactive action now to reduce the risk of large-scale, adverse impacts. The process of planning adaptive strategies requires a systematic evaluation of priorities and constraints, and the involvement of stakeholders. An overview of climate change in Africa and case studies of impacts for agriculture and water underlie discussion of a typology of adaptive responses that may be most effective for different stakeholders. The most effective strategies are likely to be to reduce present vulnerability and to enhance a broad spectrum of capacity in responding to environmental, resource and economic perturbations. In some cases, such as design of water systems, an added risk factor should be considered.
    Materialart: Digitale Medien
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  • 27
    Digitale Medien
    Digitale Medien
    Springer
    Water, air & soil pollution 85 (1995), S. 737-742 
    ISSN: 1573-2932
    Schlagwort(e): acid deposition ; heavy metals ; cadmium ; soil contamination
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract Simultaneous soil acidification and deposition of heavy metals is a major concern for forest and agricultural soils of the Black Triangle region of East Central Europe including southern former East Germany, northern Bohemia of the Czech Republic, and southern Poland. The objective of this project was to develop historical and future projections of acid and heavy metal deposition to soils (As, Cd, Pb, Zn) and to produce a preliminary map of soil sensitivity to cadmium pollution and uptake by crops. Ultimately, we wish to assess the relative hazard and recovery times of soils to metals deposition in the region. Emission and deposition data bases obtained from several models developed at IIASA were linked using the Geographical Information System ARC/INFO to produce soil maps of sensitivity to cadmium mobility based on metals deposition, soil type, soil texture, organic matter content, and acid deposition. RAINS 6.1 (Alcamo et al., 1990) was utilized to produce maps of acid deposition for EMEP grids (150 km x 150 km). The largest amount of acid load is deposited in southern East Germany. Sulfur deposition in that area was 10–12 gS/m2/yr in 1990, and S+N deposition exceeded 8000 eq/ha/yr. But the “hot spot” for metals deposition is further to the east, in the Silesia area of southern Poland. The TRACE2 trajectory model of Alcamo, Bartnicki, and Olendrzynski (1992) was used to estimate cumulative metals deposition since 1955 with scenarios to 2010. Pb has improved over Europe since 1970 when depositions in the Ruhr River Valley of West Germany exceeded 60 mg/m2/yr. But cadmium deposition in southern Poland (Katowice and Krakow) has now accumulated to 60–70 mg/m2 by atmospheric deposition alone. During base case simulations from 1955–87, approximately 1.8 mg/kg Pb and 0.12 mg/kg Cd have been added to the mixed plow-layer of ∼30 cm. If these emissions continue indefinitely, the accumulation of metals will become problematic for agriculture and the food chain.
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  • 28
    Digitale Medien
    Digitale Medien
    Springer
    Water, air & soil pollution 80 (1995), S. 789-798 
    ISSN: 1573-2932
    Schlagwort(e): Mercury ; photochemistry ; reduction ; humic substances ; environment ; natural water ; kinetic
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract Mercury (II) solutions were irradiated by a simulated sunlight in the presence of humic acid (HA) or fulvic acid (FA). Results show that, under the experimental conditions and the FA and HA chosen, less than 20% of the Hg in solution was photolysed with a rate of (1.63±0.29)×10−2 s−1 (n=23) and the rest of (2.38±0.40)×10−4 s−1 (n=23) depending on the substitutes of humic substances to which Hg were bond. The sunlight photolysis lifetimes were estimated to be 4 and 250 sunlight hours respectively under summer conditions at Stockholm latitude.
    Materialart: Digitale Medien
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  • 29
    Digitale Medien
    Digitale Medien
    Springer
    Water, air & soil pollution 89 (1996), S. 167-187 
    ISSN: 1573-2932
    Schlagwort(e): Pulp and paper mill sludge ; nitrogen ; DOC ; heavy metals ; water quality
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract Primary sludge, secondary sludge, and wood ash from a pulp and paper mill were combined with sand to create a synthetic topsoil (C:N ratio of 18:1) to restore an abandoned gravel pit. Synthetic topsoil was applied to field microcosms at rates equivalent to 0, 2170, 4341, or 6511 kg N/ha; each was seeded with grass. Fifteen chemical constituents in leachate were measured during two field seasons. Cadmium, Ni and Zn were mobilized rapidly by soil disturbance. Chloride and SO4-S eluted rapidly from the sludge along with Na. Nitrate leached with Ca late in each field season when sludge N-mineralization and nitrification exceeded plant uptake and microbial immobilization. Ammonium elution was negligible. Dissolved organic carbon (DOC) was mobilized by decomposition of organic matter in the sludge, as were Mg and K. Copper eluted with DOC, probably as an organic ligand. Lead and ortho-P were below our detection limits. We concluded that a synthetic topsoil with a 30:1 C:N ratio applied at a rate of 2100-4300 kg N/ha should provide adequate plant nutrition while minimizing water quality hazards.
    Materialart: Digitale Medien
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  • 30
    Digitale Medien
    Digitale Medien
    Springer
    Water, air & soil pollution 89 (1996), S. 317-335 
    ISSN: 1573-2932
    Schlagwort(e): Soil remediation ; extraction ; heavy metals
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract Effective remediation and sanitation technologies for soils contaminated with heavy metals are limited. We investigated the feasibility of a counter-current metal extraction procedure for the removal of selected heavy metals (Cd, Cu, Ph, and Zn) from two contaminated soils. The process involved a decarbonation (removal of carbonates), acid solubilisation, washing, and liming step. Results from batch equilibration experiments simulating the counter-current process showed more than 85% of the Cd present to be removed. Removal efficiencies for Cu and Pb were limited to approximately 15%, this mainly due to resorption of these elements during the decarbonation step. As most Zn was found to be present in a more difficult acid-extractable solid phase, its extractability accounted for only 25%. While reaction (pH) conditions of both decarbonation and solubilisation determined removal efficiencies, washing the extracted soil with deionized water only slightly increased the amount of metals removed. Metal distribution among solid phases — exchangeable, carbonate, reducible, organically bound, and residual — was affected by the different treatments. The amount of metals contained in the exchangeable and residual fractions determined their extractability. Except for Cu, the reducible and organically bound fractions were less important. After solubilisation 13 to 70% of the metals were present in an exchangeable solid phase. This implicates that washing the solubilized soil with a salt may increase the extractability of metals, especially for Zn and Pb. Based on our results the process is critically evaluated and possibilities for optimization formulated.
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  • 31
    Digitale Medien
    Digitale Medien
    Springer
    Water, air & soil pollution 90 (1996), S. 531-542 
    ISSN: 1573-2932
    Schlagwort(e): heavy metals ; smelting ; soil contamination ; plant contamination
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract Forms of Cu, Ni, and Zn in the contaminated soils of the Sudbury mining/smelting district were studied to assess metal mobility and plant availability. Soil, tufted grass (Deschampsia caespitosa (L.) Beauv.), tickle grass (Agrostis scabra Willd.), dwarf birch (Betula pumila L. var. glandulifera Regel) and white birch (Betula paprifera Marsh.) leaf and twig samples were taken from 20 locations around three Cu-Ni smelters. The sampling sites were collected to cover a wide range of soil pH and soil Cu and Ni concentrations. The water-soluble, exchangeable, sodium acetate-soluble, and total concentrations of the metals in the soils were analyzed. The soils were contaminated with Cu and Ni up to 2000 µg g−1. Zinc concentrations were also elevated in some samples above the normal soil level of 100 µg g−1. The mobility of Cu and Zn, expressed as the proportion of metals in Fl and F2 forms, increased with soil pH decrease. A strong positive correlation was found between the soil exchangeable (F2) Ni and the soil pH. Concentrations of Cu and Ni in birch twigs showed a good linear relationship with exchangeable forms of the metals in soils. A highly significant correlation was also found between total Ni in soils and the metal content of the twigs. No significant correlation was found between Zn concentrations in the soils and plants. Birch twigs are a good indicator (better than leaves) of Cu and Ni contamination of the Sudbury soils. The mobile forms of Cu and Ni and low pH seem to be the main factors that will control the success of revegetation. Strong variability of the soil metal mobility requires any reclamation effort be site-specific.
    Materialart: Digitale Medien
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  • 32
    Digitale Medien
    Digitale Medien
    Springer
    Water, air & soil pollution 90 (1996), S. 543-556 
    ISSN: 1573-2932
    Schlagwort(e): heavy metals ; solubility ; redox potential ; pH ; soil
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract To assess the mobilities of Pb, Cd, and Zn from a contaminated soil, the effects of redox potential and pH value on metal solubilities were investigated. Both redox potential and pH were found to greatly affect heavy metal solubility in the soil. Results showed that the soil suspension under continuous oxygen aeration for 21 days resulted in increases of redox potential from 290 to 440 mV and pH value from 6.9 to 7.0, respectively. Soluble concentrations of Pb, Cd, and Zn varied with time, and were all lower than 1 mg kg−1. When the soil suspension was aerated with nitrogen, final redox potential was −140 mV and pH value of 7.1. The soluble metal concentrations were slightly higher than those aerated with oxygen. The equilibrium solubility experiments were conducted under three different pH values (3.3, 5.0, 8.0) and three redox potential (325, 0, −100 mV). Results showed that metals were sparingly soluble under alkaline conditions (pH = 8.0). Metal solubilities were higher when under slightly acidic conditions (pH = 5.0), and increased drastically when pH was kept at 3.3. When solubilities were compared under same pH values, it was observed that metal solubilities increased as redox potential decreased. Generally speaking, acidic and reducing conditions were most favorable for metal solubilization, and the effect of pH was more significant than that of redox potential. It was proposed that heavy metals were mostly adsorbed onto Fe-Mn oxyhydroxides. The pH-dependent metal adsorption reaction and the dissolution of Fe-Mn oxyhydroxides under reducing conditions was the mechanism controlling the release of heavy metals from soils.
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  • 33
    Digitale Medien
    Digitale Medien
    Springer
    Water, air & soil pollution 93 (1997), S. 395-408 
    ISSN: 1573-2932
    Schlagwort(e): air pollution ; pine bark ; sulphur ; pH ; conductivity ; heavy metals
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract Sulphur and heavy metal deposition in northern Finland (= in Lapland) and the Kola Peninsula were surveyed using Scots pine bark samples. Sulphur concentrations in bark close to the Kola smelters were on an average twice as high as on the Finnish side of the border. The Cu and Ni concentrations near the smelters were almost 100-fold the mean values in northern Finland. There was a marked decrease in the sulphur and heavy metal concentrations with increasing distance from the emission sources. The effects of emission from the Kola Peninsula were evident in Finland only close to the border, especially in the eastern parts of Inari (NE corner of Lapland) where the Cu and Ni concentrations were 2- to 6-fold those in western Lapland. The sulphur and heavy metal concentrations in most of northern Finland were low. However were the concentrations of Cr in bark in the SW corner of Lapland considerably high, due to the emissions from the Tornio refined steel plants.
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  • 34
    Digitale Medien
    Digitale Medien
    Springer
    Water, air & soil pollution 93 (1997), S. 409-417 
    ISSN: 1573-2932
    Schlagwort(e): CO2 evolution ; heavy metals ; loading effect ; metal equivalent
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract In a laboratory study the effects on soil respiration of trace metals (Ni, Cd, Cu, Mn, Pb, Zn) added at loading rates ranging from 0 to 1000μg g−1 were determined. Differences in toxicity with respect to the type of metal salt added were also evaluated. The inhibitory effect on soil respiration differed considerably among the heavy metals and increased with the increasing loading rate. No linear relationships were found between the degree of inhibition and the levels of total and available metals. Toxicity evaluation at 20 and 50% inhibition of soil respiration showed Cu as the most toxic and Mn as the most tolerable metal. A ‘metal equivalent’ was calculated as the sum of the amounts of the available metals weighted to their relative toxicity with respect to the least toxic one: Mn equivalent=Mn+1.9Pb+2.1Ni+2.5Zn+6.7Cd+6.7Cu. The ionic potential of the heavy metals was found to be positively related to the percent inhibition of soil respiration. Chlorides and sulphates appeared to depress soil respiration more than nitrates, the latter counter-balancing the toxic effect of the heavy metals.
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  • 35
    Digitale Medien
    Digitale Medien
    Springer
    Water, air & soil pollution 94 (1997), S. 85-98 
    ISSN: 1573-2932
    Schlagwort(e): soil ; pollution ; heavy metals ; smelters ; factoranalysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract A combined statistical and computergraphic approach is proposed for apportionment and attribution of soil contaminants in complex areas. The field test site lies north of Swansea, south Wales and contains two major pollutant sources, an active nickel refiner and (4 km away) the site of major base metal smelting in the nineteenth century (the Lower Swansea Valley reclamation study area). Soil samples (70 samples, 0–15 cm) were collected on a regular grid of 1000 m interval. They were extracted using 0.05 M diammonium EDTA and the extracts analysed for Cd, Co, Cu, Fe, Mn, Ni, Pb and Zn. Soil pH and %organic content were also determined. Factor analysis yielded three groups which explained 73.8% of the data variance (1: Cd, Cu, %OM, Pb, Zn, Ni; 2: Cd, Zn, Mn, pH; 3: Cu, Mn, Co, Ni, Fe). Isoline plots were classifiable into the same three groups. It was concluded that factor 3 contained those elements associated with smelter emissions, factor 1 with contamination from the Lower Swansea Valley and in factor 2 pedogenetic processes control the occurrence of the elements.
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  • 36
    Digitale Medien
    Digitale Medien
    Springer
    Water, air & soil pollution 99 (1997), S. 255-263 
    ISSN: 1573-2932
    Schlagwort(e): heavy metals ; sediments ; pollution ; resuspension ; release processes ; bioavailability ; anthropogenic ; metal ; residual inetal ; geochemical phases
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract The space-time distribution of some pollutants (Cu, Ph, Zn, Cd, Fe, Mn, V, Ni, Cr) in the sludge of the canals of Venice was studied. The contamination levels were comparable to, or higher, than those measured in the most polluted sediments of the Lagoon of Venice Sediments were collected by two different sampling techniques I ) collection of sediment cores (upper 5 cm) by a syringe-type corer, 2) collection by traps, placed on the bottom of the canal Traps pennitted the sampling of sediments essentially resuspended by overlying water turbulence This sediment fraction is subjected to variations of its physicochemical parameters (principally change of redox conditions) and therefore to pollutant exchange at the water/sediment interface The metals principally exchanged during sediment resuspension were Cd, Pb, Zn and Cu These metals have principally an anthropogenic origin and are bound to the most labile geochemical phases of the sediment (such as sulphides), which can be oxidised during sediment resuspension, releasing metals into the water Fe, Cr and Ni were only partially exchanged, while Mn and V were generally not exchanged, a significant fraction of these metals is of natural origin and is bound to the most refractory phases of the sediment.
    Materialart: Digitale Medien
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  • 37
    Digitale Medien
    Digitale Medien
    Springer
    Water, air & soil pollution 95 (1997), S. 399-423 
    ISSN: 1573-2932
    Schlagwort(e): fractionation ; redistribution ; saturation ; kinetics ; heavy metals
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract Solid-phase transformations of Cd, Cu, Cr, Ni and Zn, added as soluble salts at several levels to two arid-zone soils, were studied over a period of one year. The soils were maintained under a saturated-paste regime and sampled periodically. A selective sequential dissolution procedure was employed to determine the changes in metal distribution among six operationally defined solid-phase fractions. A function, Uts was introduced to measure the fractional attainment of equilibrium of the soils following a perturbation. The direction and rate of redistribution of the added metals in the soils were affected by the nature of the metal, the soil properties and the metal loading level. Cd added to the soils was transferred from the exchangeable (EXC) into the carbonate (CARB) fraction. When soluble Cu, Cr, Ni and Zn were added at low loading levels, metals were transferred from the reducible oxides(RO) bound and easily reducible oxides (ERO) bound fractions and the EXC fraction, into the CARB fraction. However, at the higher loading level, metals were transferred from the EXC and CARB fractions into the organic matter bound (OM), ERO and RO fractions. The Uts function approached lower values as incubation continued but remained removed from 1. The overall flux of metals among fractions was the combined result of the readjustment of the metals in the native soil to changing conditions due to saturation, and the transfer of added soluble metals to the less labile fractions.
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  • 38
    ISSN: 1573-2932
    Schlagwort(e): Acari ; bioindicators ; Gamasida ; heavy metals ; Oribatida ; Scots pine forest
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract The soil mites were investigated in the areas covered with dead needles in young Scots pine forests (plant associationLeucobryo-Pinetum), polluted by a copper smelting works at Głogów, and in a control plot. The concentration of heavy metals, mainly copper and lead, was the lowest in the control plot, and increased towards the pollution source. A high concentration of these metals reduced the density of mites and species number of Oribatida and Gamasida, while small concentrations were associated with the increasing abundance of mites and species number of Oribatida. Among mites, the following categories were distinguished: a) sensitive to heavy metals, b) sensitive to a high concentration, but tolerant of small concentrations, and c) tolerant of these metals. The changed vertical distribution of mites in the most polluted soil was also observed, due to accumulation of heavy metals in the Of/h horizon.
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  • 39
    Digitale Medien
    Digitale Medien
    Springer
    Water, air & soil pollution 99 (1997), S. 651-659 
    ISSN: 1573-2932
    Schlagwort(e): River sediments ; biofilms ; organic micropollutants ; heavy metals ; temporal variations ; biosorption ; accumulation processes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract In a partly urbanized catchment to the south of Trier, Germany, short term variations in river sediment compounds as well as the bioaccumulation of pollutants on surface associated microbial coatings (biofilms) were investigated weekly during a period of six months. Concentrations of selected heavy metals (Cu, Zn, Pb), polycyclic aromatic hydrocarbons (PAH), polychlorinated biphenyls (PCB) and for microbial characterisation protein, carbohydrate and uronic acid were analyzed. Sorption processes on biofilms were determined by temporal variations in pollutants and microbial parameters and through the comparison of sorbed substances in biofilms and sediments. The results show, that sorption events on biofilms play an important and dynamic role in spring and summer for transport and accumulation of the investigated pollutants in the aquatic environment. The amount of pollutants sorbed on sediment particles is not only dependent on the particulate bound or solved pollutants in the river water, but is strongly controlled by the changing conditions of the biofilms.
    Materialart: Digitale Medien
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  • 40
    Digitale Medien
    Digitale Medien
    Springer
    Environmental monitoring and assessment 50 (1998), S. 159-171 
    ISSN: 1573-2959
    Schlagwort(e): age ; biomonitoring ; heavy metals ; seabirds
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract The effects of age on cadmium concentrations was investigated in Cory's shearwater, Calonectris diomedea, Lesser black-backed gull, Larus fuscus, and great skuas, Catharacta skua. There was no evidence for the continued accumulation of cadmium with increasing adult age. Adult shearwaters did have higher concentrations of cadmium compared to young fledglings, but there was no significant difference between cadmium concentrations in adult and sub-adult gulls. In addition, the sample of great skuas were of known age (3–22 yrs old) and showed no evidence of increasing cadmium concentrations with adult age in liver or kidney. However, it is possible that age accumulation of cadmium in great skuas was masked by individual dietary preferences overriding the effects of increasing age. It is often assumed that cadmium concentrations continue to accumulate with increasing adult age, but seabirds may have evolved some as yet unknown mechanism for excretion or more rapid turnover of cadmium than previously thought. The implications of this for the use of seabirds as biomonitors is discussed.
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  • 41
    Digitale Medien
    Digitale Medien
    Springer
    Environmental monitoring and assessment 55 (1999), S. 389-399 
    ISSN: 1573-2959
    Schlagwort(e): accumulation ; heavy metals ; mine spoils ; vegetation ; soil-plant relationships
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract The presence of heavy metals (Cr, Ni and Fe) in soil and accumulated by herbs, shrubs and trees regenerated naturally on the minewaste-dumps of Sukinda chromite mines (TISCO sector) were investigated. There was significant correlationship between Cr and Fe in the soil where a tree species (Catunaregam spinosa) occurred. Guazuma ulmifolia and Diospyros montana also did show significant correlation between leaf, stem and soil for Cr, Ni and Fe. Among the shrubs (Calotropis gigantea, Chromolaena odorata, Phyllanthus reticulatus and Woodfordia fruticosa) significant and positive correlations were obtained for Cr and Ni in soil and iron and nickel in leaf and chromium and nickel in stem. Among the annual herbs, whole plant of tephrosia purpurea and Borrevia articularis showed significant and positive correlation with chromium and nickel with the maximum correlation coefficient value. It was concluded that the above information would be useful in revegetation programmes in subtropical regions having seasonal rainfall.
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  • 42
    Digitale Medien
    Digitale Medien
    Springer
    Environmental monitoring and assessment 59 (1999), S. 249-256 
    ISSN: 1573-2959
    Schlagwort(e): alum ; effluent ; environment ; hydrogen peroxide ; oxygen demand ; suspended particles
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract This paper assessed the composition of waste water effluent generated by a Petrochemical industry and a treatment system developed to improve the quality of the discharge water. Parameters as pH, COD, TSS chloride and lead ions were analysed and treated comparatively using hydrogen peroxide. At pH 8.0 post treatment analysis showed a COD – 96 mg/l TSS – 48 mg/l Cl – 798.75 mg/l and Pb2+ – 2 mg/l for treatment D where 40 g/l of alum was used on 30% solution of H2O2 compared to systems A-C. Process treatment included activated clay with sodium ion resin which at pH 6.8 had COD – 52 mg/l, TSS – 10 mg/l, Cl – 510 mg/l and Pb2+ – 0.070 mg/l. This system has an overall efficiency of 79.0% TSS, 45.83% COD, 97.5% Pb2+ and 36.1% Cl reduction. Characteristics obtained for the study has a higher efficiency compared with FEPA and WHO standard for similar industrial water treatment.
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  • 43
    ISSN: 1573-2959
    Schlagwort(e): birds ; environmental pollutants ; heavy metals
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract Levels of environmental pollutants are usually higher in mainland and coastal areas than in offshore or oceanic islands due to higher inputs from agricultural and industrial sources. Levels of heavy metals are usually higher in adult than in young birds, because they have had longer to accumulate metals in their tissues, and/or because they may eat larger, more contaminated, prey. We examined the levels of arsenic, cadmium, chromium, lead, manganese, mercury, and selenium in the adults and young of Bonin petrel (Pterodroma hypoleuca), Christmas shearwater (Puffinus nativitatis) and red-tailed tropicbird (Phaethon rubricauda) on Midway Atoll, and adult wedge-tailed shearwater (Puffinus pacificus) on Midway Atoll and on Manana Island (off Oahu) in the northern Pacific. All birds were analyzed individually except for Christmas Shearwater chicks where samples were pooled to obtain sufficient quantities for analysis. Significant (p〈0.05) age-related differences were found for mercury, selenium, manganese and chromium in Bonin petrels, for selenium and mercury in Christmas shearwaters, and for chromium and mercury in Red-tailed Tropicbirds. Lead approached significance for all three species. Adults had higher levels than young except for chromium and manganese in the petrels and arsenic in all three species. There were significant interspecific differences in concentrations of all metals except arsenic for the adults nesting on Midway. Christmas shearwaters had the highest levels of all metals except mercury and chromium. Bonin petrels, the smallest species examined, had mercury levels that were over three times higher than any of the adults of the other three species. For wedge-tailed shearwaters, levels of chromium and lead were significantly higher, and manganese and selenium were lower on Midway than Manana. Knowledge of the foraging ranges and habits of these far-ranging seabirds is inadequately known, but does not currently explain the observed differences among species. We could not find a consistent pattern of differences between the burrow nesting species (Bonin petrel, Wedge-tailed shearwater) and the surface nesting tropicbirds. There was no consistent pairwise correlation between any metals across all species.
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  • 44
    Digitale Medien
    Digitale Medien
    Springer
    Environmental monitoring and assessment 59 (1999), S. 321-330 
    ISSN: 1573-2959
    Schlagwort(e): agar diffusion assay ; Arabian Gulf ; chromogenic bacteria ; heavy metals ; toxicity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract A simple method – direct agar diffusion assay – was optimised for rapid assessment of heavy metal toxicity to marine chromogenic and non-chromogenic bacteria. The procedure involved spotting of a 10 microliter test solution on the seeded agar plate and incubation of the plates at 30°C to accelerate bacterial growth. Under optimum conditions, test results were obtainable within 12–18 hr instead of 96 hr incubation time generally required for a marine bacterial assay by conventional agar plate methods. A range of sixteen heavy metals, each at 5 different concentrations was tested. Toxicity was demonstrated by the formation of a clear zone of growth inhibition around the point of application. Toxicity of tested chemicals could be easily demonstrated at concentrations as low as 0.1 μg per spot on the agar plate. A dose dependent relation between metal concentration (μg/spot) and the diameter of the clear zone on agar plate was observed, suggesting potential of this method as an easy and economical tool in quantitative toxicology studies.
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  • 45
    Digitale Medien
    Digitale Medien
    Springer
    Environmental and ecological statistics 4 (1997), S. 321-336 
    ISSN: 1573-3009
    Schlagwort(e): agriculture ; ecology ; Carabidae ; contingency tables ; partial association
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract The influence of the cultivated plant stand, subject to the timing of sampling, on the occurrence of selected carabid species is investigated for three years running. Due to the nominal character of the factors (cultivar, timing, carabid species and year) we used log-linear models of four dimensional contingency tables under certain hypotheses of independence. A coefficient of contingency is calculated for characterizing the partial association between two factors respectively. The difference in G 2 's between two nested models is used to test if there are differences between the three years concerning the strength of partial association between the number of beetles in the selected species and the cultivar or the sampling time respectively.
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  • 46
    Digitale Medien
    Digitale Medien
    Springer
    Journal of agricultural and environmental ethics 1 (1988), S. 109-121 
    ISSN: 1573-322X
    Schlagwort(e): forages ; pasture ; environment ; societal concerns ; sustainable agriculture
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Philosophie
    Notizen: Abstract The necessity of incorporating societal and environmental concerns into publicly funded agricultural initiatives in research, extension, and practice is increasingly evident. Agriculturalists are urged to acknowledge and respond to societal concerns before an insensitive and largely ill-informed urban majority assumes a dominant posture in agricultural policy. In recent history, the availability of unrealistically cheap energy encouraged the evolution of a form of commercial agriculture unfettered by sound ecological principles. At present, external, resource-intensive intervention of increasing magnitude is needed to compensate for the apparent ecological instability generated by practices such as intensive cereal management or conservation tillage practices. Polarization of the enterprises of plant and animal agriculture to enable centralized, concentrate-intensive, confinement feeding has disrupted the natural cycling of nutrients and carbon in the soil, encouraged the withdrawal of perennial forages from crop rotations, and invoked a widely ramifying network of agricultural and societal problems. Solutions to these problems must evolve from a holistic and far-reaching appraisal of causes, rather than from a piecemeal approach to individual symptoms.
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  • 47
    Digitale Medien
    Digitale Medien
    Springer
    Journal of agricultural and environmental ethics 4 (1991), S. 1-13 
    ISSN: 1573-322X
    Schlagwort(e): ethanol ; food ; energy ; environment ; pollution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Philosophie
    Notizen: Abstract Problems of fuel ethanol production have been the subject of numerous reports, including this analysis. The conclusions are that ethanol: does not improve U.S. energy security; is uneconomical; is not a renewable energy source; and increases environmental degradation. Ethanol production is wasteful of energy resources and does not increase energy security. Considerably more energy, much of it high- grade fossil fuels, is required to produce ethanol than is available in the energy output. About 72% more energy is used to ‘produce a gallon of ethanol than the energy in a gallon of ethanol. Ethanol production from corn is not renewable energy. Its production uses more non- renewable fossil energy resources in growing the corn and in the fermentation/distillation process than is produced as ethanol energy. Ethanol produced from corn and other food crops is also an unreliable and therefore a non-secure source of energy, because of the likelihood of uncontrollable climatic fluctuations, particularly droughts which reduce crop yields. The expected priority for corn and other food crops would be for food and feed. Increasing ethanol production would increase degradation of agricultural land and water and pollute the environment. In U.S. corn production, soil erodes some 18- times faster than soil is reformed, and, where irrigated, corn production mines water faster than recharge of aquifers. Increasing the cost of food and diverting human food resources to the costly and inefficient production of ethanol fuel raise major ethical questions. These occur at a time when more food is needed to meet the basic needs of a rapidly growing world population.
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  • 48
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    Journal of agricultural and environmental ethics 5 (1992), S. 113-146 
    ISSN: 1573-322X
    Schlagwort(e): climate change ; food ; agriculture ; ethics ; technologies
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Philosophie
    Notizen: Abstract Burning fossil fuel in the North American continent contributes more to the CO2 global warming problem than in any other continent. The resulting climate changes are expected to alter food production. The overall changes in temperature, moisture, carbon dioxide, insect pests, plant pathogens, and weeds associated with global warming are projected to reduce food production in North America. However, in Africa, the projected slight rise in rainfall is encouraging, especially since Africa already suffers from severe shortages of rainfall. For all regions, a reduction in fossil fuel burning is vital. Adoption of sound ecological resource management, especially soil and water conservation and the prevention of deforestation, is important. Together, these steps will benefit agriculture, the environment, farmers, and society as a whole.
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  • 49
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    Journal of agricultural and environmental ethics 3 (1990), S. 5-20 
    ISSN: 1573-322X
    Schlagwort(e): agriculture ; waste ; environment ; economic ; social ; costs ; erosion ; pesticides ; water
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Philosophie
    Notizen: Abstract Because the agriculture/food sectors appear to be driven by short-term economic and political forces, cheap energy, and agricultural-chemical technologies, waste and environmental/social problems in the agricultural/food sectors are estimated to cost the nation at least $150 billion per year. Most of the waste and environmental/social problems can be eliminated through better resource management policies and the adoption of sustainable agricultural practices.
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  • 50
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    Journal of agricultural and environmental ethics 6 (1993), S. 53-60 
    ISSN: 1573-322X
    Schlagwort(e): Agriculture ; organic ; energy ; economics ; environment
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Philosophie
    Notizen: Abstract The use of organic farming technologies has certain advantages in some situations and for certain crops such as maize; however, with other crops such as vegetables and fruits, yields under organic production may be substantially reduced compared with conventional production. In most cases, the use of organic technologies requires higher labor inputs than conventional technologies. Some major advantages of organic production are the conservation of soil and water resources and the effective recycling of livestock wastes when they are available.
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  • 51
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    Journal of agricultural and environmental ethics 7 (1994), S. 157-172 
    ISSN: 1573-322X
    Schlagwort(e): press ; agriculture ; ethics ; newspapers ; farm magazines
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Philosophie
    Notizen: Abstract All major journalism ethical codes explicitly state that journalists should protect editorial copy from undue influence by outside sources. However, much of the previous research on agricultural information has concentrated on what information various media communicate (gatekeeping studies) or communication's role in increasing innovation adoption (diffusion studies). Few studies have concentrated specifically on organizational and structural constraints that might adversely affect agricultural journalists' ethical standards; those that have, focus largely on farm magazines. A study of newspaper reporters who cover agricultural news found that the most pressing ethical concern is the effect of advertiser (agri-business) pressure on editorial copy, and that their concerns in general parallel those of farm magazine writers and editors. The majority reported being in situations in which they might be exposed to advertiser pressure, including pressures to change or withhold editorial copy. Large minorities suggested that advertising pressures affect the overall environment in which agricultural journalists work, and more than one in ten said they allow advertiser pressures to influence editorial decisions. The newspaper reporters who cover agricultural beats showed slightly more resistance to advertiser pressure than did farm magazine editors in a parallel study.
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  • 52
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    Journal of agricultural and environmental ethics 8 (1995), S. 112-125 
    ISSN: 1573-322X
    Schlagwort(e): agribusiness ; biotechnology ; crop adaptation ; crop diversity ; crop management ; crop varieties ; disease resistance ; environment ; genetic engineering ; holistic agriculture ; insect resistance ; new technology ; plant breeding ; societal responsibility ; sustainable agriculture
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Philosophie
    Notizen: Abstract Biotechnology can provide appropriate new tools for use in solution of specific problems in sustainable agriculture. Its usefulness will depend in large part on the degree to which sustainable agriculturists understand the utility of biotechnology and apply it toward ends they deem important. Biotechnology can give little assistance to sustainable agriculture in the short term. It can be more useful in the medium term, and it could be highly useful in the long term as an integral part of the art and science of plant breeding and other components of sustainable agriculture systems.
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  • 53
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    Journal of agricultural and environmental ethics 8 (1995), S. 190-197 
    ISSN: 1573-322X
    Schlagwort(e): dissection ; ethics ; academic freedom ; autonomy ; environment ; science education
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Philosophie
    Notizen: Abstract The focus of the paper is the ethical issues associated with the practice of dissecting animals in lower level college biology classes. Several arguments against dissection are explored. Furthermore, the issue is examined from the point of view of the instructor's academic freedom and the point of view of a student's moral autonomy. It is argued that even though the arguments against dissection fail, it is very important to respect the moral autonomy of students who oppose the practice. Often this can be accomplished in a manner that is consistent with academic freedom and good science education.
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  • 54
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    Journal of agricultural and environmental ethics 1 (1988), S. 175-192 
    ISSN: 1573-322X
    Schlagwort(e): Biodiversity ; biotechnology ; ecology ; ecosystem ; environment ; ethics ; evolution ; genetics ; health ; medicine
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Philosophie
    Notizen: Abstract The maintenance of biodiversity is urged from many quarters and on grounds ranging from aesthetic considerations to its usefulness, particularly for biotechnology. But regardless of the grounds for preserving biodiversity, writers are generally in agreement that it should be preserved. But, in examining the various references “biodiversity,” such as species diversity, genetic diversity, and habitat diversity, it is apparent that we cannot aim to preserve biodiversityas such, since there are a number of conflicts in any such undertaking. In preserving one aspect of biodiversity, we damage another aspect. Five arguments which attempt to ground our moral concern for biodiversity are reviewed and critiqued, not only for their consistency but also for their power to move us to action. The final section of the paper shows how conflicts in the values of personal and environmental health can impair ethical action and especially policy formation.
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  • 55
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    Journal of agricultural and environmental ethics 5 (1992), S. 1-26 
    ISSN: 1573-322X
    Schlagwort(e): sustainability ; environment ; ecology ; development ; resources ; carrying capacity ; eco development
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Philosophie
    Notizen: Abstract Six separate but related strains of thought have emerged prominently since 1950 in discussions of such phenomena as the interrelationships among rates of population growth, resource use, and pressure on the environment. They are the ecological/carrying capacity root, the resources/environment root, the biosphere root, the critique of technology root, the “no growth”/“slow growth” root, and the ecodevelopment root. Each of these strains of thought was fully developed before the word “sustainable” itself was used. Many of the roots are based on fundamentally opposing assessments of the future of mankind. Many of the roots, such as the ecology/carrying capacity root, are based on physical concepts, and they exclude normative values. Others, such as the ecodevelopment root, include such values as equity, broad participation in governance, and decentralized government. When the word “sustainability” was first used in 1972 in the context of man's future, in a British book,Blueprint for Survival, normative concepts were prominent. This continued to be the case when the word was first used in 1974 in the United States to justify a “no growth” economy. “Sustainability” was first used in a United Nations document in 1978. Normative concepts, encapsulated in the term “ecodevelopment,” were prominent in the United Nations publications. After about 1978, the term “sustainability” began to be used not only in technological articles and reports but also in policy documents culminating in the use of the term in the report of the summit meeting of the Group of Seven in 1989. The roots of the term “sustainability” are so deeply embedded in fundamentally different concepts, each of which has valid claims to validity, that a search for a single definition seems futile. The existence of multiple meaning is tolerable if each analyst describes clearly what he means by sustainability.
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  • 56
    ISSN: 1573-1642
    Schlagwort(e): decomposition ; heavy metals ; litterbags ; nitrification ; nitrogen mineralization ; urbanization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Energietechnik
    Notizen: Abstract We investigated litter mass loss and soil nitrogen (N)-transformation rates in oak stands along a 130-km, urban-rural transect originating in New York City to examine the relationship between changes in these parameters and previously documented differences in soil temperature, heavy metal and total salt concentrations, and soil biota. Reference litter from a rural site was placed in litterbags, and rates of mass loss and changes in N concentration in litter residues were measured over a 6-month period. Net N-mineralization and nitrification rates were measured in A horizon soils using laboratory incubations under constant moisture and temperature. Both mass loss (76%) and N release (65%) from litterbags reached their maximum in urban stands, whereas net N-mineralization rates were 2.3-fold higher than in rural A horizon soils. Litter fragmentation by earthworms and higher soil temperatures are potential causes of the higher mass loss rates observed in urban stands. The higher releases of N measured in the urban litterbags could be a result of their faster mass loss rates, exogenous inputs of N from atmospheric deposition, a relatively low heterotrophic demand for N, or a combination of these factors. The results of this study suggest that in comparison with rural stands, urban forests are characterized by comparatively high rates of litter decomposition, and may also be characterized by comparatively high rates of N mineralization. Additional studies are needed to test whether these effects are common to urban environments in general.
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  • 57
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    Urban ecosystems 3 (1999), S. 113-129 
    ISSN: 1573-1642
    Schlagwort(e): environment ; risk ; economics ; process ; methods
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Energietechnik
    Notizen: Abstract Houston Environmental Foresight, an urban region comparative risk assessment, demonstrated the importance of process as well as analytic methodology. These features are best illustrated in the work of its Socioeconomic Subpanel, which assessed environmental risks to economic well-being and quality of life. Several issues are raised by the process and methods used by the subpanel. Some of these issues could be addressed through national research on comparative risk methods; other issues are most likely to be addressed through the incremental improvements of future projects.
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  • 58
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    Environmental and resource economics 1 (1991), S. 313-332 
    ISSN: 1573-1502
    Schlagwort(e): Manure problem ; nutrient policy ; nutrient surplus ; regulatory levy ; sustainability ; agriculture ; intensive livestock sector ; acidification ; groundwater pollution ; eutrophication
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Wirtschaftswissenschaften
    Notizen: Abstract Rapid increases in livestock production in the Netherlands have changed manure from a valuable input into a mere waste product. This is especially true for the southern and eastern parts of the country, where specialized pig and poultry farms have concentrated on sandy soils. As these farms generally own very little land, they largely depend on imported feedstuffs. As a consequence, manure is applied to the land in such large quantities that serious environmental problems have resulted: (1) eutrophication of surface water by phosphate emissions; (2) pollution of groundwater by nitrate emissions; and (3) acidification by ammonia emissions. In the last few years the Dutch government has developed a manure policy to counteract these effects. Our analysis of that policy has revealed at least three fundamental defects, which render the manure policy ineffective and inefficient. In this paper proposals are made to remove the defects in current manure policy. Much attention is paid to the problem of designing a mixture of policy instruments which is both effective as well as efficient in limiting the environmental problems caused by manure. It is shown that the use of financial incentives in regulation can substantially improve the efficiency of the manure policy. Finally, the main economic consequences of the proposed policy are examined for the public sector as well as for the agricultural sector.
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  • 59
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    Environmental and resource economics 2 (1992), S. 373-398 
    ISSN: 1573-1502
    Schlagwort(e): Adoption ; irrigation technology ; environment ; drainage pollution ; policy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Wirtschaftswissenschaften
    Notizen: Abstract Modern irrigation technologies have been suggested as a means of conserving scarce water and reducing environmental pollution caused by irrigated agriculture. This paper applies an economic model of technology selection that provides a general framework to analyzing adoption of irrigation technologies under various environmental conditions. Data from the San Joaquin Valley of California is used to verify the theoretical relationships. Results suggest key variables to be considered by policy makers concerned with adoption of modern irrigation technologies. Among these variables are crop prices, water technology costs, farm organization characteristics, and the environmental conditions of the farm or the field. Policy implications were discussed and analyzed.
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  • 60
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    Environmental and resource economics 3 (1993), S. 285-296 
    ISSN: 1573-1502
    Schlagwort(e): Pollution control ; nitrogen taxation ; agriculture
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Wirtschaftswissenschaften
    Notizen: Abstract Amongst possible economic incentives to encourage reduced nitrate contamination of water, this paper emphasizes a nitrogen tax as a possible solution. This finding is based on models estimated from panel data for 100 intensive livestock farms. For each farm a threshold is established (nitrogen units which can be spread per hectare without damage) above which there is an excess of nitrogen. The 100 farms can consequently be classified into two subsamples. The demand for nitrogen is derived for each sub-sample using the dual approach. Both categories are pooled together and a tobit model is estimated. This is used to derive total nitogen demand if all farms were under the threshold. A mineral nitrogen tax would lead to a reduced nitrate concentration in water supplies, because of a more efficient use of organic nitrogen together with a reduction in the use of mineral nitrogen in crop production.
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  • 61
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    Environmental and resource economics 11 (1998), S. 459-472 
    ISSN: 1573-1502
    Schlagwort(e): environment ; incone distribution ; poverty
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Wirtschaftswissenschaften
    Notizen: Abstract This paper deals with the key distributional issues arising from the regulation of the environment and the management of natural resources. The paper is divided into a section dealing with poverty and a section dealing with broader income distribution effects. Although there is much discussion of the linkages of poverty to environmental degradation, empirical studies establishing these linkages are few. The relationship is critically dependent on the institutional structures in the countries concerned and how they respond to changing environmental pressures. On the broader distributional impacts, the papers focusses on the analysis of ganiers and losers from environmental regulations. The analysis is complex because the direct incidence is not the same as the final incidence. Much of the work has looked only at the former. In addition, the political economy of regulation needs to pay greater attention to impacts on key and vulnerable groups; more so than can be done by looking at broad income bands.
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  • 62
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    Environmental and resource economics 15 (2000), S. 397-401 
    ISSN: 1573-1502
    Schlagwort(e): agriculture ; benefit ; damage ; environment ; externality ; forestry ; hedonic pricing ; tourism ; valuation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Wirtschaftswissenschaften
    Notizen: Abstract In this study, the hedonic price method was used toidentify and monetarize some of the external effectsof agricultural and sylvicultural activities. Weexamined the renting price of ruralself-catering cottages, or gîtes. Intensivelivestock farming caused the renting-price ofgîtes to decrease, whereas permanent grassland hadthe opposite effect.
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  • 63
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    Environmental and resource economics 17 (2000), S. 145-162 
    ISSN: 1573-1502
    Schlagwort(e): agriculture ; natural resources, and environmental accounting
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Wirtschaftswissenschaften
    Notizen: Abstract In this paper, we develop atheoretically consistent framework to incorporate theenvironmental effects of agricultural production andthe depletion of natural capital caused byagricultural production into the existing incomeaccounts. We apply the framework and adjust theincome attributed to the agricultural sector andeconomy-wide net national product (NNP) for the UnitedStates. Estimated adjustments to the incomeattributed to agriculture are in the range of $4billion and have declined as a percentage of net farmincome since 1982.
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  • 64
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    Environmental and resource economics 8 (1996), S. 225-271 
    ISSN: 1573-1502
    Schlagwort(e): Price distortions ; government policy ; Kenya ; land degradation ; soil conservation ; environment ; economics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Wirtschaftswissenschaften
    Notizen: Abstract This paper develops an approach that uses relatively easily-available data to examine empirically how policy-induced price changes affect the incentives of farmers in developing countries to adopt soil conservation measures. The model shows that there is no simple relationship between price distortions created by government policies and farmers' incentives to adopt conservation measures. Policy-induced price changes could lead to either more or less conservation, depending on site-specific conditions. Data from a semi-arid region in Kenya are used to illustrate the magnitude and direction of changes in price policy on returns to terracing and to show how results are affected by the nature of the conservation technology. In the study area, higher commodity prices increase incentives to adopt conservation measures on steep slopes, but lower them on shallower slopes. If terraces were to require more land to be taken out of production than assumed in the calculations, higher commodity prices would tend to discourage farmers from adopting them.
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  • 65
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    Mitigation and adaptation strategies for global change 3 (1998), S. 133-170 
    ISSN: 1573-1596
    Schlagwort(e): climate change ; environment ; fertility rates ; greenhouse gas emissions scenarios ; IIASA ; IPAT ; IPCC ; IS92 ; population ; population projections ; United Nations ; U.S. Census Bureau ; World Bank
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Geographie
    Notizen: Abstract A survey is made of the latest world population projections issued by the United Nations, World Bank, U.S. Census Bureau, and International Institute for Applied Systems Analysis. Medium variants from all the organizations show excellent agreement with respect to many features of future world population growth. It appears that little would be gained by obtaining additional regional projections made by governments or organizations other than those listed above. In general, the new range of population projections that are candidates for forthcoming IPCC emissions scenarios are narrower and lower than the previous IPCC IS92 population range: a reflection of updated information on the decline of fertility rates in developing countries and the incorporation of a plausible correlation between mortality rates and fertility rates within the IIASA ‘rapid’ and ‘slow’ demographic transition variants. Comments are made on the schematic approach of forecasting CO2 emissions using multiplicative identities such as ‘IPAT’ (impact/emissions = population × affluence × technology). Although the unqualified IPAT model suggests that emissions should scale linearly with population, a number of caveats to this exist, the most important of which may be factor interactions. A brief review is made of conventional thinking about interactions between population growth and economic development. Correlation studies and theory suggest that population growth has a neutral or, at most, weak negative effect on economic growth. Conversely, it is well established that higher per capita incomes are well correlated with lower fertility and mortality rates in developing countries. Therefore, a plausible first-order relationship worth exploring in the next generation of IPCC scenarios is that scenarios with higher average economic growth rates in the developing world should be associated with lower fertility and mortality rates there. Calculations are presented that illustrate the effect this negative correlation could have had on the range of the older IS92 emission scenarios, assuming that all other factors are unchanged. Finally, some policy issues concerning population and global warming are reviewed in connection with the IPCC’s omission of population policy discussion in its 1995 Second Assessment Report.
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    Mitigation and adaptation strategies for global change 4 (1999), S. 25-41 
    ISSN: 1573-1596
    Schlagwort(e): adaptation ; agriculture ; climate change ; Kazakhstan
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Geographie
    Notizen: Abstract Agriculture in Kazakhstan is sensitive to climate, and wheat yields could be reduced up to 70% under climate change. With the transition from a socialist economy to a free market economy, decisions are being made now that will affect Kazakhstan's ability to cope with climate change. A team of Kazakh and American researchers examined the cost-effectiveness and barriers to implementations of adaptation options for climate change. Twelve adaptation options that increase flexibility to respond to climate change were identified using a screening matrix. Four options, forecasting pest outbreaks, developing regional centers for preserving genetic diversity of seeds, supporting a transition to a free market, and reducing soil erosion through the use of changed farming practices, were examined. The Adaptation Decision Matrix (ADM) was then applied to estimate benefits using expert judgment (using an arbitrary numerical scale, not monetary values) and benefits estimates were compared to costs to determine cost-effectiveness. The ADM uses subjective measures of how well adaptation options meet policy objectives. Controlling soil erosion was estimated to have the highest benefits, but the high costs of implementation appears to make it relatively cost-ineffective. Supporting a transition to a free market was ranked as the most cost-effective measure, with regional centers second. However, use of different scales to quantify benefits or different weights can result in regional centers being more cost-effective than the transition to a free market. Regional centers was also judged to have fewer barriers to implementation than a transition to a free market. These results will be incorporated in Kazakhstan's National Action Plan. The ADM and other tools are relatively easy to apply, but are quite subjective and difficult to evaluate. The tools can be quite useful by decision makers to analyze advantages and disadvantages between different adaptation options, but should be supplemented with additional, particularly quantitative analysis.
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    Mitigation and adaptation strategies for global change 4 (1999), S. 137-165 
    ISSN: 1573-1596
    Schlagwort(e): adaptation ; agriculture ; climate change ; decision-making ; variability
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Geographie
    Notizen: Abstract This work presents a framework for viewing agricultural adaptation, emphasizing the multiple spatial and temporal scales on which individuals and institutions process information on changes in their environment. The framework is offered as a means to gain perspective on the role of climate variability and change in agricultural adaptation, and developed for a case study of Australian agriculture. To study adaptation issues at the scale of individual farms we developed a simple modelling framework. The model highlights the decision making element of adaptation in light of uncertainty, and underscores the importance of decision information related to climate variability. Model results show that the assumption of perfect information for farmers systematically overpredicts adaptive performance. The results also suggest that farmers who make tactical planting decisions on the basis of historical climate information are outperformed by those who use even moderately successful seasonal forecast information. Analysis at continental scales highlights the prominent role of the decline in economic operating conditions on Australian agriculture. Examples from segments of the agricultural industry in Australia are given to illustrate the importance of appropriate scale attribution in adapting to environmental changes. In particular, adaptations oriented toward short time scale changes in the farming environment (droughts, market fluctuations) can be limited in their efficacy by constraints imposed by broad changes in the soil/water base and economic environment occuring over longer time scales. The case study also makes the point that adaptation must be defined in reference to some goal, which is ultimately a social and political exercise. Overall, this study highlights the importance of allowing more complexity (limited information, risk aversion, cross-scale interactions, mis-attribution of cause and effect, background context, identification of goals) in representing adaptation processes in climate change studies.
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    Mitigation and adaptation strategies for global change 1 (1996), S. 139-165 
    ISSN: 1573-1596
    Schlagwort(e): Adaptation ; agriculture ; agroforestry ; climate change ; drought ; ecological degradation ; factor bias ; Senegal ; sustainability ; social relations
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Geographie
    Notizen: Abstract The ongoing drought in the Sahel region of West Africa highlights the vulnerability of food-producing systems to climate change and variability. Adaptation to climate should therefore increase the sustainability of agriculture under a long-term drought. Progress towards sustainability and adaptation in the the Senegal River Basin is hampered by an existing set of social and ecological relationships that define the control over the means of production and how people interact with their environment. These relationships are sensitive to the technological inputs and the administration of food production, or the factor bias in the different policy alternatives for rural development. One option is based on state-controlled, irrigated plantations to provide rice (Oryza) for the capital, Dakar. This policy emphasizes a top-down management approach, mechanized agriculture and a reliance on external inputs which strengthens the relationships introduced during the colonial period. A time series decomposition of the annual flow in the Senegal River at Bakel in Senegal suggests that water resources availability has been substantially curtailed since 1960, and a review of the water resources budget or availability in the basin suggests that this policy's food production system is not sustainable under the current climate of the basin. Under these conditions, this program is exacerbating existing problems of landscape degradation and desertification, which increases rural poverty. A natural resource management policy offers two adaptation strategies that favour decentralized management and a reduction of external inputs. The first alternative, “Les Perimetres Irrigués”, emphasizes village-scale irrigation, low water consumption cereal crops and traditional socio-political structures. The second alternative emphasizes farm-level irrigation and agro-forestry projects to redress the primary effects of desertification. The water requirements of both the rice import substitution program and the natural resource management program are calculated. A water resources simulation model/optimization analysis using dynamic programming is used to compare these two alternatives to the rice import substitution programs. Results indicate that the natural resource management policy could potentially bring a large area into production while using far less water than the rice import substitution program. The natural resource management policy, in particular the second alternative with its emphasis on individual ownership and ecological rehabiliation, defines a different set of social and ecological relationships that appear to enhance the sustainability of food production under a long-term drought.
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  • 69
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    Mitigation and adaptation strategies for global change 1 (1997), S. 219-232 
    ISSN: 1573-1596
    Schlagwort(e): climate change ; mediterranean region ; agriculture ; cereal production ; impact assessment
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Geographie
    Notizen: Abstract Current trends in Mediterranean agriculture reveal differences between the Northern and Southern Mediterranean countries as related to population growth, land and water use, and food supply and demand. The changes in temperature and precipitation predicted by general circulation models for the Mediterranean region will affect water availability and resource management, critically shaping the patterns of future crop production. Three companion papers analyze in detail future impacts of predicted climate change on wheat (Triticum aestivum L.) and maize (Zea mays L.) production in Spain, Greece, and Egypt, and test farm- level adaptation strategies such as early planting and cultivar change with the aid of dynamic crop models. Strategies to improve the assessment of the potential effects of future climate change on agricultural production are discussed.
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  • 70
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    Mitigation and adaptation strategies for global change 1 (1997), S. 273-288 
    ISSN: 1573-1596
    Schlagwort(e): climate change ; vulnerability ; adaptation ; agriculture ; Spain ; wheat ; maize
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Geographie
    Notizen: Abstract This study evaluates the theoretical impact of climate change on yields and water use of two crops with different responses to increased CO2 and which represent contrasting agricultural systems in Spain. In all cases the simulated effects of a CO2-induced climate change depended on the counteracting effects between higher daily ET rates, shortening of crop growth duration and changes in precipitation patterns as well as the simulated effects of CO2 on the water use efficiency of the crops. For summer irrigated crops such as maize, the yield reductions and the exacerbated problems of irrigation water availability simulated with climate change may force the crop out of production in some regions. For winter dryland crops such as wheat, productivity increased significantly in some regions, suggesting a northward shift of area suitable for wheat production in future climates. The study considered strategies for improving the efficiency of water use based on the optimization of crop management decisions in a CO2-driven warmer climate.
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  • 71
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    Mitigation and adaptation strategies for global change 1 (1997), S. 233-250 
    ISSN: 1573-1596
    Schlagwort(e): climate change ; vulnerability ; adaptation ; agriculture ; Egypt
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Geographie
    Notizen: Abstract If no timely measures are taken to adapt Egyptian agriculture to possible climate warming, the effects may be negative and serious. Egypt appears to be particularly vulnerable to climate change because of its dependence on the Nile River as the primary water source, its large traditional agricultural base, and its long coastline, already undergoing both intensifying development and erosion. A simulation study characterized potential yield and water use efficiency decreases on two reference crops in the main agricultural regions with possible future climatic variation, even when the beneficial effects of increased CO2 were taken into account. On-farm adaptation techniques which imply no additional cost to the agricultural system, did not compensate for the yield losses with the warmer climate or improve the crop water-use efficiency. Economic adjustments such as the improvement of the overall water-use efficiency of the agricultural system, soil drainage and conservation, land management, and crop alternatives are essential. If appropriate measures are taken, negative effects of climate change in agricultural production and other major resource sectors (water and land) may be lessened.
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  • 72
    Digitale Medien
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    Mitigation and adaptation strategies for global change 1 (1997), S. 219-232 
    ISSN: 1573-1596
    Schlagwort(e): climate change ; mediterranean region ; agriculture ; cereal production ; impact assessment
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Geographie
    Notizen: Abstract Current trends in Mediterranean agriculture reveal differences between the Northern and Southern Mediterranean countries as related to population growth, land and water use, and food supply and demand. The changes in temperature and precipitation predicted by general circulation models for the Mediterranean region will affect water availability and resource management, critically shaping the patterns of future crop production. Three companion papers analyze in detail future impacts of predicted climate change on wheat (Triticum aestivum L.) and maize (Zea mays L.) production in Spain, Greece, and Egypt, and test farm- level adaptation strategies such as early planting and cultivar change with the aid of dynamic crop models. Strategies to improve the assessment of the potential effects of future climate change on agricultural production are discussed.
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  • 73
    Digitale Medien
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    Mitigation and adaptation strategies for global change 1 (1997), S. 233-250 
    ISSN: 1573-1596
    Schlagwort(e): climate change ; vulnerability ; adaption ; agriculture ; Egypt
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Geographie
    Notizen: Abstract If no timely measures are taken to adapt Egyptian agriculture to possible climate warming, the effects may be negative and serious. Egypt appears to be particularly vulnerable to climate change because of its dependence on the Nile River as the primary water source, its large traditional agricultural base, and its long coastline, already undergoing both intensifying development and erosion. A simulation study characterized potential yield and water use efficiency decreases on two reference crops in the main agricultural regions with possible future climatic variation, even when the beneficial effects of increased CO2 were taken into account. On-farm adaptation techniques which imply no additional cost to the agricultural system, did not compensate for the yield losses with the warmer climate or improve the crop water-use efficiency. Economic adjustments such as the improvement of the overall water-use efficiency of the agricultural system, soil drainage and conservation, land management, and crop alternatives are essential. If appropriate measures are taken, negative effects of climate change in agricultural production and other major resource sectors (water and land) may be lessened.
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  • 74
    Digitale Medien
    Digitale Medien
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    Mitigation and adaptation strategies for global change 1 (1997), S. 273-288 
    ISSN: 1573-1596
    Schlagwort(e): climate change ; vulnerability ; adaptation ; agriculture ; Spain ; wheat ; maize
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Geographie
    Notizen: Abstract This study evaluates the theoretical impact of climate change on yields and water use of two crops with different responses to increased CO2 and which represent contrasting agricultural systems in Spain. In all cases the simulated effects of a CO2-induced climate change depended on the counteracting effects between higher daily ET rates, shortening of crop growth duration and changes in precipitation patterns as well as the simulated effects of CO2 on the water use efficiency of the crops. For summer irrigated crops such as maize, the yield reductions and the exacerbated problems of irrigation water availability simulated with climate change may force the crop out of production in some regions. For winter dryland crops such as wheat, productivity increased significantly in some regions, suggesting a northward shift of area suitable for wheat production in future climates. The study considered strategies for improving the efficiency of water use based on the optimization of crop management decisions in a CO2-driven warmer climate.
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  • 75
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    Journal of fusion energy 16 (1997), S. 133-140 
    ISSN: 1572-9591
    Schlagwort(e): Inertial fusion ; tritium ; activation products ; safety ; environment
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract This paper summarizes safety and environmental issues of Inertial Fusion Energy (IFE): inventories, effluents, maintenance, accident safety, waste management, and recycling. The fusion confinement approach among inertial and magnetic options affects how the fusion reaction is maintained and which materials surround the reaction chamber. The target fill technology has a major impact on the target factory tritium inventory. IFE fusion reaction chambers usually employ some means to protect the first structural wall from fusion pulses. This protective fluid or granular bed also moderates and absorbs most neutrons before they reach the first structural wall. Although the protective fluid activates, most candidate fluids have low activation hazard. Hands-on maintenance seems practical for the driver, target factory, and secondary coolant systems; remote maintenance is likely required for the reaction chamber, primary coolant, and vacuum exhaust cleanup systems. The driver and fuel target facility are well separated from the main reaction chamber.
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  • 76
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    Journal of fusion energy 17 (1998), S. 141-150 
    ISSN: 1572-9591
    Schlagwort(e): energy ; environment
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract The availability of affordable energy is an essential element to global economic development. Energy is needed for virtually every important function in modern society from growing and cooking food, to manufacturing, the heating and cooling of buildings, and transportation. The interruption of supplies by storms, earthquakes, wars, or other disasters quickly demonstrates how totally dependent we have become on the energy-consuming machines that shape and support our lives.
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  • 77
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    Journal of fusion energy 18 (1999), S. 109-115 
    ISSN: 1572-9591
    Schlagwort(e): Fusion energy ; environment
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract A number of external factors affecting the pace and direction of fusion energy development are reviewed and discussed. These include the changing electric utility marketplace environment, the availability of fossil fuels, competing power sources, and environmental issues.
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  • 78
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    Human ecology 14 (1986), S. 15-28 
    ISSN: 1572-9915
    Schlagwort(e): organic agriculture ; agriculture ; China ; energy flow ; agroecology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract The energy flows in a seventeenth century agroecosystem in Jiaxing region of eastern China were analyzed on the basis of historical data. The agroecosystem included cropping, mulberry-silkworm, livestock, and fishing systems. In terms of energy, the agroecosystem was sustainable. Human labor provided all the power with inputs of about 3700 hr per hectare of farmland. Most or 70% of the labor was expended in the cropping system. Human and animal manure provided most of the nutrients for crop and mulberry production. About two-thirds of the total manure was used in crop production and one-third in the mulberry plantations. The only fossil energy input was a few hand tools. Approximately 55% of the grain was consumed directly by local residents, about one-third of the grain was used to make an alcohol drink and produce distillers'grains, which was fed to pigs, and only 2% of the grains were exported outside the agroecosystem. About two-thirds of the harvested crop residues were used as household fuel, while the remainder was returned to the field as an organic fertilizer. Pork accounted for 85% and silk cocoons 14% of the total animal products produced. Even though the agroecosystem was generally sustainable in terms of energy, the major environmental problem was that two-thirds of the harvested crop residues were used for household fuel. This reduced nutrient cycling in the system. Insufficient land was available to produce fuelwood;thus, crop residues were the primary source of fuel for the people.
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  • 79
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    Human ecology 15 (1987), S. 221-242 
    ISSN: 1572-9915
    Schlagwort(e): agriculture ; shifting cultivation ; biomass ; energy ; cultural ecology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract Shifting cultivation has traditionally been characterized as a highly productive system in terms of the ratio of energy outputs to inputs. This characterization, however, does not take into account the energy contribution of the natural vegetation cleared in preparing the field for cultivation. As a result, the central feature of shifting cultivation, the exploitation of the natural vegetationsoil complex as a substitute for human labor, has been ignored. The omission of the biomass contribution can be attributed to both a focus on the practices involved rather than the underlying strategy of the shifting cultivator, and an excessive preoccupation with the renewability of the energy sources involved in different agricultural systems. A definition of shifting cultivation is proposed that focuses attention on the relationship between the natural vegetationsoil complex and the shifting cultivator. Two methods of including the energy contribution of forest biomass in calculating the productivity of shifting cultivation systems are compared. When the biomass contribution is included, shifting cultivation appears to be an extremely unproductive system of agriculture.
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  • 80
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    Human ecology 15 (1987), S. 301-315 
    ISSN: 1572-9915
    Schlagwort(e): New Guinea ; taro ; agriculture ; monoculture ; subsistence ecology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract An ancient, sustainable, and low risk Colocasiataro monoculture has persisted until modern times among the Mountain Ok peoples of central New Guinea. There is a monoculture-polyculture axis in the region with taro monocultures predominant in the rain forests of the mid-altitude fringe. We argue that when examined from the standpoint of ecosystem simplification, biological variability, and subsistence vulnerability, the taro monocultures exhibit many ecological and systemic properties commonly attributed to polycultures. Monoculture is not an exclusive category; specific cases must be placed in a broader context of the larger ecosystem and the options people have at their disposal. Reduction of the taro monoculture is occurring in response to modernization pressures.
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  • 81
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    Human ecology 17 (1989), S. 205-228 
    ISSN: 1572-9915
    Schlagwort(e): time-allocation ; pregnancy and lactation ; women ; subsistence labor ; seasonality ; childcare ; mortality ; Nepal ; agriculture
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract Minute-by-minute observation of individual women over the period of a year provides a reliable and valuable description of their daily activities. The extent to which Nepalese rural women vary their subsistence responsibilities during pregnancy and lactation is examined by comparing mothers with a non-childbearing sample. The remarkable behavioral similarity between the two groups of women when workloads are high is explained by reference to childcare practices and labor constraints prevailing in the community.
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  • 82
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    Human ecology 20 (1992), S. 145-167 
    ISSN: 1572-9915
    Schlagwort(e): agriculture ; development ; diversity ; stability
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract This paper reconsiders two widely held hypotheses about the effects of the green revolution, that it led to biological simplification and instability. The hypothesis of biological simplification (genetic erosion) is tested with evidence from Andean agriculture, where farmers maintain a significant degree of crop diversity even as they adopt modern crop varieties. The hypothesis of increased instability is tested with evidence from Asia where wheat and rice yields show no general pattern of increased instability. Neither of these hypotheses is confirmed. The conventional wisdom about the green revolution should be reconsidered with emphasis on resilience and variation in modernizing farming systems.
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  • 83
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    Human ecology 25 (1997), S. 223-242 
    ISSN: 1572-9915
    Schlagwort(e): agriculture ; population ; settlement ; land tenure ; conflict ; Nigeria
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract While many studies have explored how agriculture changes when population density rises, this paper examines actions farmers may take to control whether population density rises. Using information from ethnographic fieldwork, colonial archives, and air photography, two agricultural groups migrating into an agricultural frontier in the Nigerian savanna are compared. Population density in Kofyar communities has risen to over 100/km 2 ; Tiv communities, although older, have maintained population densities of around 50/km 2 , in part through intimidation of encroachers. This use of intimidation is a component of a distinctive adaptive strategy that includes settlement stability, high population mobility tied to witchcraft accusations, relatively extensive cultivation allowing considerable off-time, and reliance on social networks to facilitate residential mobility and land access. Population pressure must be seen as an integral part of this adaptive strategy, rather than as cause or consequence.
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  • 84
    ISSN: 1572-9915
    Schlagwort(e): South American Indians ; Brazil ; Amazonia ; development ; human ecology ; land use ; Xavánte ; agriculture ; land use ; nutrition
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract This paper explores the process of change in a Brazilian indigenous community, relating it to historical, economical, and political forces at the regional and national levels, as well as to environmental variables. In the light of current fieldwork, we examine the predictions of a model constructed 20 years ago based on fieldwork in this and three other Indian communities of Central Brazil by Daniel Gross and collaborators. This model ascribed involvement in the market economy of small-scale communities primarily to land circumscription and resulting environmental degradation, increasing the labor cost of subsistence food production. We find that in the case of the Xavánte community entry into the market was more the result of a top-down government plan to implement mechanized rice production on Xavánte reservations. With the collapse of the project the Xavánte have, on the one hand, returned to a more “traditional” economy based on hunting, gathering, and swidden agriculture and, on the other hand, are innovating by marketing their cultural image through connections with national and international environmentalist organizations.
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  • 85
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    Human ecology 8 (1980), S. 311-327 
    ISSN: 1572-9915
    Schlagwort(e): agriculture ; nutrition ; food preferences ; Tanzania
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract Archival and ethnographic research carried out in northeastern Tanzania provides evidence of significant changes in production and consumption of staple food crops between 1850 and the present. The banana, which provided the bulk of calories and other nutrients in precolonial times, has been successively replaced by Irish potatoes, maize, and cassava in different localities. The reasons for the adoption of each of these introduced crops are explored, and their implications for human nutrition in the area are discussed.
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  • 86
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    Human ecology 9 (1981), S. 23-45 
    ISSN: 1572-9915
    Schlagwort(e): ecology ; environment ; perceptions ; United Nations ; international
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract To what extent have recent warnings of deepening ecological problems become topics of discussion among international political elites? To address this question a content analysis was undertaken of the speeches comprising the general debates of the 1968, 1972, and 1976 sessions of the UN General Assembly to identify all instances in which ecological issues were mentioned. Despite other indications of an increase in environmental consciousness in the international community, it was found that ecological problems have not been discussed very extensively in the general debates and are far less salient than several other agenda items for which data were also collected. Moreover, the environment peaked as an issue in the 1972 session and declined in prominence in 1976. It was also found that the more developed a country is, the greater the tendency for its delegates to mention environmental problems in their speeches. The lack of prominence of ecological issues is interpreted on the basis of two alternative assumptions: first, that the degree of international awareness of environmental problems is not adequately represented in the general debates and, second, that the findings accurately reflect what is generally a low level of environmental concern in international circles.
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  • 87
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    Human ecology 7 (1979), S. 41-52 
    ISSN: 1572-9915
    Schlagwort(e): technology ; catastrophe ; environment ; risk
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract This paper presents three propositions. First, the author suggests that there is a growing potential for technologically induced catastophes. Second, our capacity to analyze technological risk is inhibited in part because: (1) we tend to confuse low-probability/low-consequence events with low-probability/high-consequence risks; (2) we seldom adopt a holistic approach to the analysis of risk; and (3) we tend to underestimate the effects of catastrophic events. The author further argues that existing control systems, including federal regulatory bodies, are inadequate. In the conclusion the author discusses difficulties likely to accompany the design and creation of risk control systems.
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  • 88
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    Human ecology 23 (1995), S. 291-334 
    ISSN: 1572-9915
    Schlagwort(e): agriculture ; sustainability ; Africa ; crop pests ; crop diseases
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract This paper attempts to identify the main threats to and sources of sustainability in African agricultural systems by examining cases of unsustainability and resilience at various levels. Current concepts of sustainable agriculture are based mainly on the experiences and norms of western industrial nations and may not be appropriate to sub-Saharan Africa and other developing regions. The things we want to sustain comprise a hierarchy of attributes, components, and systems at increasing scales, and it is important to examine the dynamics of sustainability at each significant level as well as the impacts of events at one level on others. Cases of crop declines and of collapses of larger systems indicate that extreme perturbations, both biophysical and social, are more important as causes of unsustainability than suggested in the literature, while the significance of resource degradation or of overuse of technological inputs have been overemphasized. Survey data from Kenya and Nigeria show that the main causes of crop disappearances have been major disease or pest outbreaks, followed by changes in crop preferences. Fertility and land use stresses have been only a tertiary factor. Sources of resilience that have buffered households and larger systems from the impacts of these range from farmers' strategies of crop and income diversification and searches for resistant cultivars to interventions by national and international bodies. Numerous population and large-scale system collapses have also occurred over the past century in Africa, almost all caused by extreme social and/or biophysical perturbations. There is no evidence that land degradation or land use pressure has played a significant role in these. Increased land use pressure has led to the disappearance or alteration of many prior practices, though farmers have generally adapted to these. Resource management systems have also declined due to outmigration as regions undergo a transition from remote and relatively closed systems to more open systems. These may call for a greater rather than lower use of modern technology to enhance the income earning potential of agricultural production.
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  • 89
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    Human ecology 15 (1987), S. 1-26 
    ISSN: 1572-9915
    Schlagwort(e): Amazon ; fire ; fishing ; agriculture ; energetics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract Studies of Río Negro subsistence farming and fishing activities are used to estimate the human carrying capacity for the region and the likely pattern of human land-use during prehistory. Ceramic evidence suggests human presence in the region more than 3000 years ago. Traditional farming is labor intensive and relatively unproductive. Nevertheless, farmers achieve an energy return of 15.2∶1, and produce 2600 kcal per work hour. Fish are the major protein source, but fish catch per unit of effort and fish yield per hectare of floodplain are very low; fishermen are probably exploiting local fish resources very close to their limit. The low human population density would suggest that the Río Negro forest has been relatively undisturbed. Nevertheless, charcoal is widespread and abundant in forest soils. This charcoal is probably from anthropogenic or natural wildfires. These results suggest a much more complex history for Amazonia than previously thought.
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  • 90
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    Human ecology 18 (1990), S. 105-130 
    ISSN: 1572-9915
    Schlagwort(e): agriculture ; forest farming ; social history ; Appalachia
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract This research uses aggregate statistical sources to describe agricultural diversity in a 31 county area of Appalachian Kentucky over the period 1880–1910. In particular, it considers the distribution and duration of forest farming in this region. It examines the causes of agricultural diversity by testing a series of hypotheses conceptually based in ecological theory. For 1880, counties differed in the degree to which they had the characteristics expected for forest farming. This variation was geographically patterned. While there was still geographical variation in county agricultural characteristics in 1910, sufficient change had occurred so that none of the counties continued to closely conform to the pattern expected for forest farming. Variation and change in county agricultural characteristics were found to be related to population density and growth, soil quality, the presence of railroads, and the development of commercial coal mining.
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  • 91
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    Human ecology 17 (1989), S. 257-271 
    ISSN: 1572-9915
    Schlagwort(e): environment ; Sikkim
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract This paper discusses the problems of environment and development in Sikkim Himalaya. Two features of Sikkim, the fragile mountain environment and the very rapidly growing population, are crucial in formulating future development plans. An integrated approach to development and environmental conservation is suggested.
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  • 92
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    Human ecology 8 (1980), S. 105-116 
    ISSN: 1572-9915
    Schlagwort(e): agriculture ; biomass ; biomass distribution ; biomass change ; net primary productivity ; vegetation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract Changes in worldwide grain production area are analyzed to assess the impact of major agricultural activity onglobal biomass. During the 26-year study period, nearly 1% of the earth's ice-free land surface was converted to grain production. This increase in agricultural area reduced the planetary biomass; however, it had minimal effect on net primary productivity. Geographically, the overall change caused by increased grain production has been to redistribute the planetary biomass poleward.
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  • 93
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    Human ecology 12 (1984), S. 203-206 
    ISSN: 1572-9915
    Schlagwort(e): swidden cultivation ; agriculture ; native South America ; tropical forest
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract Stocks (1983) suggested four reasons which motivate the planting of South American tropical forest swidden crops in concentric rings. His third proposal, that of protection from insect pests, is examined in the light of recent fieldwork with the Bari, and reformulated to suggest that protection from mammalian pests may be a more accurate explanation of the value of this type of field architecture.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 94
    ISSN: 1572-9915
    Schlagwort(e): land use ; land cover ; Amazon ; estuary ; flooded forest ; aÇai ; palms ; agriculture ; pastures ; swidden ; slash-and-burn agriculture ; succession ; remote sensing ; GIS
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract Landsat TM scenes for 1985 and 1991 are used to produce a georeferenced map of land cover and land use for an area of the Amazon estuary inhabited by three populations of caboclos with distinct patterns of land use. This information is combined in a geographic information system with ethnographic and survey research carried out over the past 5 years to develop representative spectral “signatures” which permit measurement and differentiation of land uses and the detection of change even between small areas of managed floodplain forest and unmanaged forest, and between three distinct age/growth classes of secondary succession following deforestation. Implementation of these procedures permit the scaling up or down of research at different resolutions. Three distinct patterns of land use are examined with differential impact on the environment. Mechanized agriculture at one site has eliminated virtually all the mature upland forest and is now dominated by secondary successional vegetation. The more traditional system of diversified land use at the next site shows a subtle cycling of flooded forest to managed palm forest through time in response to the price of palm fruit and cycling in the use of fallow land. A third site, based on palm fruit extractivism, shows minimal changes in land cover due to persistent specialization on management of flooded forest extraction. There is little evidence that the community with the greatest impact on forest cover is any better off economically than the two communities which have minimal impact on the landscape. This study suggests how a balance between use and conservation in Amazonia may be achieved in floodplain and estuarine areas, and the effectiveness of monitoring these types of land cover from satellite platforms.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 95
    Digitale Medien
    Digitale Medien
    Springer
    Human ecology 25 (1997), S. 91-120 
    ISSN: 1572-9915
    Schlagwort(e): forests ; food ; economics ; environment ; ecology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract We assembled information on the contribution and value of forests to world food security. An assessment was made of the role of forests and non-timber products in the food system of developing countries. We estimated that upwards of 300 million people annually earn part or all of their livelihood and food from forests. A total of about $90 billion in non-timber products are harvested each year. Forests also help to protect land, water, and biological resources, and they play an important role in maintaining the productivity of agricultural and environmental systems.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 96
    Digitale Medien
    Digitale Medien
    Springer
    Human ecology 13 (1985), S. 271-289 
    ISSN: 1572-9915
    Schlagwort(e): agriculture ; population density ; labor efficiency ; Kalimantan
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract The “Boserup hypothesis” contends that land-intensive systems of agriculture will be adopted only when high population density precludes the use of land-extensive methods. In the Kerayan District of East Kalimantan (Indonesia) the Lun Dayeh practice permanent-field rice cultivation despite very low human densities. An examination of the relative labor efficiencies of shifting and permanent-field agriculture in the Kerayan, as well as of local environmental and historical variables, explains why this “anomalous” situation exists. It is argued that since relative success in production of rice by shifting- and permanent-field irrigated methods depends on many natural and social conditions other than levels of population density, the “environment-free” Boserup hypothesis cannot adequately explain or predict the occurrence of particular forms of rice agriculture.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 97
    Digitale Medien
    Digitale Medien
    Springer
    Human ecology 14 (1986), S. 1-14 
    ISSN: 1572-9915
    Schlagwort(e): organic agriculture ; agriculture ; China ; energy flow ; agroecology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract The cropping systems of seventeenth century traditional organic agriculture in the Jiaxing region of eastern China required about 2000 hr of labor per hectare for rice production. Rice and related grain crops were produced employing only human power. The input was about 200 times that for most mechanized grain production today. The charcoal or fossil energy input to produce simple hand tools accounted for only 1–2% total energy in the crop systems. Organic wastes including manures, pond sediments, and green manure crops supplied most of the nutrients. Rice yields, ranging as high as 6700–8400 kg/ha, were similar to some of the highest yields today. The energy output/input ratio ranged from 9 for compost-fertilized rice to 12 for green manure-fertilized rice production. These ratios were 2–10 times higher than most mechanized rice production systems of today. Knowledge of the crop and soil system enabled the early Chinese farms to maintain high crop yields and sustain highly productive soils.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 98
    Digitale Medien
    Digitale Medien
    Springer
    Human ecology 24 (1996), S. 521-539 
    ISSN: 1572-9915
    Schlagwort(e): development ; environment ; national parks ; state policy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract National parks are the keystone institutions of environmental conservation. Because national parks make certain lands part of the state itself, international agencies and nongovernmental organizations that promote national parks propose, in effect, to alter the state, as well as the local economy and state relations with social groups. Has international political pressure caused states to create national parks? I consider whether countries highly involved in international politics have the largest proportions of land in national parks. I conclude that many states create minimal park systems as symbolic gestures to the international community. Field researchers may find it easier to explain the success or failure of parks if they identity why state officials decide that adopting international conservation norms will enhance state authority over people and state sovereignty over land.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 99
    Digitale Medien
    Digitale Medien
    Springer
    Human ecology 9 (1981), S. 305-329 
    ISSN: 1572-9915
    Schlagwort(e): avifauna ; pueblos ; garden hunting ; prehistoric ; agriculture
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Energietechnik , Ethnologie
    Notizen: Abstract Analysis of faunal remains from prehistoric southwestern pueblo sites reveals certain commonly occurring species of mammals and birds, the latter including ducks and geese, hawks and eagles, American Kestrel, Mourning Dove, owls, Horned Lark, Common Raven, and jays. This phenomenon is examined with the analysis of bird bones from four New Mexican pueblos located in north-central and west-central New Mexico. Recovered faunal remains date to specific periods between A.D. 1250 and the present. Over 70 species of birds represent various ecological situations; many of these species presently do not occur near the pueblos and a few occur only in the extreme southeastern portion of the state. Marsh and riparian areas along the river systems and richer grasslands on the floodplains would account for most of these species occurring near the sites prehistorically. However, rather than attribute unusual species to climatic change, trade, or long-distance hunting expeditions by the Indians, an alternative explanation is offered which attributes high species diversity to areas of human disturbance. Disturbed areas such as agricultural fields can increase species diversity in an area and aid in the range extension of many animals. The primary factor in this situation, besides the crops themselves, is believed to be insects, which attract other animals, particularly birds and their predators. In addition, field irrigation systems act to extend riparian growth from the river across the floodplain, creating habitats for these animals. Finally, certain groups of birds and mammals have developed a natural attraction to human settlements and agricultural areas and these include species whose remains commonly occur in prehistoric pueblo sites. The avifauna from these sites also reveals information on the prehistoric use of birds as inferred from bone modification, cut marks, burials, and articulated wings.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 100
    ISSN: 1573-2932
    Schlagwort(e): copper ; element flux ; heavy metals ; Pinus ; soil pollution ; understorey vegetation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract Distribution and fluxes of copper within Pinus sylvestris stands were studied during 1992–1994 along a heavy-metal pollution gradient in south-western Finland. The stands are situated at distances of 0.5, 4 and 8 km from a copper-nickel smelter that started operating in 1945 at Harjavalta. According to the results, copper concentrations in the soil, in the understorey vegetation and in the trees increased steeply towards the smelter. Almost 50 years' accumulation of heavy metals in the soil has caused direct toxic effects to soil microbes, thus decreasing decomposition and nutrient mineralisation. During the past few years, sulphur and heavy metal emissions from the copper and nickel smelter have been radically decreased. However, the heavy metals which have been accumulating in the soil for decades continue to affect the vegetation for a long time through soil processes. Consequently, long-term accumulation in the soil has to be taken into account when determining the critical loads of forest ecosystems for heavy metals.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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