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  • Articles  (11)
  • agriculture  (11)
  • 1985-1989  (7)
  • 1980-1984  (4)
  • Energy, Environment Protection, Nuclear Power Engineering  (11)
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  • Articles  (11)
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  • 1
    ISSN: 1572-9915
    Keywords: organic agriculture ; agriculture ; China ; energy flow ; agroecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: 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.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 15 (1987), S. 221-242 
    ISSN: 1572-9915
    Keywords: agriculture ; shifting cultivation ; biomass ; energy ; cultural ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: 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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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 15 (1987), S. 301-315 
    ISSN: 1572-9915
    Keywords: New Guinea ; taro ; agriculture ; monoculture ; subsistence ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: 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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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 17 (1989), S. 205-228 
    ISSN: 1572-9915
    Keywords: time-allocation ; pregnancy and lactation ; women ; subsistence labor ; seasonality ; childcare ; mortality ; Nepal ; agriculture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: 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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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 8 (1980), S. 311-327 
    ISSN: 1572-9915
    Keywords: agriculture ; nutrition ; food preferences ; Tanzania
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: 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.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 15 (1987), S. 1-26 
    ISSN: 1572-9915
    Keywords: Amazon ; fire ; fishing ; agriculture ; energetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: 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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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 8 (1980), S. 105-116 
    ISSN: 1572-9915
    Keywords: agriculture ; biomass ; biomass distribution ; biomass change ; net primary productivity ; vegetation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: 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.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 12 (1984), S. 203-206 
    ISSN: 1572-9915
    Keywords: swidden cultivation ; agriculture ; native South America ; tropical forest
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: 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.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 13 (1985), S. 271-289 
    ISSN: 1572-9915
    Keywords: agriculture ; population density ; labor efficiency ; Kalimantan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: 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.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 14 (1986), S. 1-14 
    ISSN: 1572-9915
    Keywords: organic agriculture ; agriculture ; China ; energy flow ; agroecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: 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.
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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 9 (1981), S. 305-329 
    ISSN: 1572-9915
    Keywords: avifauna ; pueblos ; garden hunting ; prehistoric ; agriculture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: 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.
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