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  • 1990-1994  (55)
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  • 1
    Keywords: Fungi. ; Mycology. ; Microbiology. ; Plants Evolution. ; Plant biotechnology. ; Plant diseases. ; Plants Development. ; Fungi. ; Plant Evolution. ; Plant Biotechnology. ; Plant Pathology. ; Plant Development. ; Microbiology.
    Description / Table of Contents: 1. Overview -- 2. Ectomycorrhizal fungi invasions in Southern South America -- 3. Pseudomonotes tropenbosii, an endemic Dipterocarp tree from a Neotropical terra firme forest in Colombian Amazonia that hosts ectomycorrhizal fungi -- 4. Arbuscular Mycorrhizal Fungi in the Colombian Amazon: A Historical Review -- 5. AMF diversity in coffee and cacao agroforestry systems: importance for crop productivity and forest conservation -- 6. Potential of arbuscular mycorrhizas for the remediation of soils impacted with pollutants -- 7. Diversity of Arbuscular Mycorrhizal Fungi in the Ecuadorian Amazon region. -- 8. Orchid Mycorrhizas in South America: Tropical and Subtropical Ecosystems -- 9. Symbiotic propagation of South American orchids -- 10. Arbuscular mycorrhizal fungi in agroecosystems of East-Central Argentina: two agricultural practices effects on taxonomic groups -- 11. Metal soil contamination, metallophytes and arbuscular mycorrhizal fungi from South America -- 12. Native and exotic woodland from Patagonian Andes: Anthropic impacts and Mycorrhizas -- 13. Current Knowledge on Mycorrhizal Symbiosis and Endophytes in northwest Patagonia, Argentina -- 14. Mycorrhizas in Nothofagus from South America: what do we know from nursery and field experiences? -- 15. Arbuscular mycorrhizal fungi in the Espinal Ecoregion, gaps and opportunities -- 16. Edible ectomycorrhizal mushrooms in South America -- 17. Arbuscular mycorrhizal symbiosis in temperate grassland forage species of Argentina -- 18. Current trends and challenges in viticulture using arbuscular mycorrhizal fungi -- 19. Communities of Glomeromycota in the Argentine Arid Diagonal: an approach from their ecological role in grassland management and use -- 20. The current scenario of the distribution, functionality and ecosystemic role of the arbuscular mycorrhizal symbiosis in Chile -- 21. Mycorrhizas and Restoration in South America -- 22. Gaps in South American mycorrhizal biodiversity and ecosystem function research.
    Abstract: In order to feed the world, global agriculture will have to double food production by 2050. As a result, the use of soils with fertilizers and pesticides in agronomic ecosystems will increase, taking into account the sustainability of these systems and also the provision of food security. Thus, soil ecosystems, their health, and their quality are directly involved in sustainable agronomical practices, and it is important to recognize the important role of soil microbial communities such as mycorrhizal fungi, their biodiversity, interactions, and functioning. Soil ecosystems are under the threat of biodiversity loss due to an increase of cultivated areas and agronomic exploitation intensity. Also, changes in land use alter the structure and function of ecosystems where biodiversity is vital in the ecosystem. Soils are a major aid in food production in all terrestrial ecosystems; however, this means they are also involved in gas emission and global warming. Thus, in agronomic ecosystems, several mitigation practices have been proposed to promote the increase of carbon soil stock, and the reduction of warming gas emission from soils. In South America, most of the rural population depends economically on agriculture and usually works in family units. New, organic, safe, and sustainable agro-forestry practices must be applied to support local communities and countries to achieve hunger eradication, rural poverty reduction, and sustainable development. This book compiles new information for mycorrhizal occurrence in natural and anthropic environments in South America. It includes new reports of mycorrhizal fungi diversity along different mycorrhizal types and their effect on plant communities, plant invasions, the use of mycorrhizal fungi for ecological and sustainable studies, management programs of natural and agroecosystems, and forestry and food-secure production. This book fills the gaps in biodiversity knowledge, management and safe food production of mycorrhizas. It should be a valuable help to researchers, professors and students, to aid in use of mycorrhizal fungi while also focusing on their biodiversity, sustainable safe food production, and conservation perspectives.
    Type of Medium: Online Resource
    Pages: VIII, 465 p. 65 illus., 58 illus. in color. , online resource.
    Edition: 1st ed. 2022.
    ISBN: 9783031129940
    Series Statement: Fungal Biology,
    DDC: 579.5
    Language: English
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  • 2
    Monograph available for loan
    Monograph available for loan
    Amsterdam [u.a.] : Elsevier
    Associated volumes
    Call number: PIK N 531-93-0143
    In: Ecosystems of the world
    Type of Medium: Monograph available for loan
    Pages: 527 S.
    ISBN: 0444428127
    Series Statement: Ecosystems of the world
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 3
    Monograph available for loan
    Monograph available for loan
    Dorderecht [u.a.] : Kluwer
    Associated volumes
    Call number: 104579
    In: Water, air, and soil pollution
    Type of Medium: Monograph available for loan
    Pages: 466 p.
    ISSN: 0049-6979
    Series Statement: Water, air, and soil pollution
    Branch Library: PIK Library
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Restoration ecology 2 (1994), S. 0 
    ISSN: 1526-100X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Land rehabilitation is proposed as a management strategy to reverse the negative consequences of tropical deforestation and land degradation. We first define the concepts associated with ecosystem modification—conversion, damage, and degradation—and those associated with ecosystem repair—restoration, rehabilitation, and reclamation. We then present a scheme of sustainable land use in the tropics, with illustrations of how rehabilitation and restoration activities fit into the overall scheme of the use of land. Because damaged lands cannot contribute effectively to sustained economic development, land rehabilitation is a necessary step for increasing the chances of attaining sustainability. Approaches for rehabilitating ecosystems are discussed, including the management of stressors and subsidies in relation to their point of interaction in the ecosystem. Finally, we illustrate the concepts of ecosystem rehabilitation of damaged, degraded, and derelict lands with examples of case studies from dry to humid life zones in island and continental situations throughout the tropics. The case studies demonstrate that opportunities for success exist, even with severely degraded lands, but a considerable amount of research remains to be done before we have a full understanding of the complexity of the task facing us.
    Type of Medium: Electronic Resource
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  • 5
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    Madrid : Periodicals Archive Online (PAO)
    Estudios geográficos. 53:206 (1992:enero/abr.) 77 
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  • 6
    ISSN: 1432-0975
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Wave measurements at Margarita Reef in southwestern Puerto Rico show that wave height decreases as waves travel across the forereef and into the backreef. Wave spectra reveal the presence of two wave trains impinging on the reef during the study: trade-wind waves and locally generated seas. Significant wave height calculated from the spectra show an average reduction of 19.5% from 20- to 10-m isobaths and 26% from 20- to 5-m isobaths. The significant wave height decreases an average of 82% for waves traveling across the reef crest and into the backreef. Wave-energy reduction is 35% from 20- to 10-m isobaths and 45% from 20- to 5-m isobaths. Energy loss across the reef crest is 97% which translates into the formation of strong across-the-reef currents capable of moving coarse sediment. Refraction diagrams of waves impinging on the reef from the SE provide a display of wave energy distribution around the reef. The transmission coefficients calculated for trade-wind waves and locally generated seas have means of 18% and 39%, respectively. A wave height model with negligible energy dissipation, produces wave height estimates that are, in general, within the ±15% error bands. Results of wave-energy changes from this study were applied to waves representative of hurricane conditions at the reef. Aerial photographs of the reef before and after the passage of hurricanes were compared to assess the reef changes. Changes observed in the photographs are interpreted as products of sediment transport by hurricane-generated waves. The patterns of change agree with the refraction diagrams suggesting that waves were the main agents of change at margarita Reef during severe storms.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of bioenergetics and biomembranes 24 (1992), S. 125-129 
    ISSN: 1573-6881
    Keywords: Nigericin ; carboxylic polyether ; carboxylic ionophore ; ion transport ; ionic complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Physics
    Notes: Abstract Nigericin is a monocarboxylic polyether molecule described as a mobile K+ ionophore unable to transport Li+ and Cs+ across natural or artificial membranes. This paper shows that the ion carrier molecule forms complexes of equivalent energy demands with Li+, Cs+, Na+, Rb+, and K+. This is in accordance with the similar values of the complex stability constants obtained from nigericin with the five alkali metal cations assayed. On the other hand, nigericinalkali metal cation binding isotherms show faster rates for Li+ and Cs+ than for Na+, K+, and Rb+, in conditions where the carboxylic proton does not dissociate. Furthermore, proton NMR spectra of nigericin-Li+ and nigericin-Cs+ complexes show wide broadenings, suggesting strong cation interaction with the ionophore; in contrast, the complexes with Na+, K+, and Rb+ show only clear-cut chemical shifts. These latter results support the view that nigericin forms highly stable complexes with Li+ and Cs+ and contribute to the explanation for the inability of this ionophore to transport the former cations in conditions where it catalyzes a fast transport of K+〉Rb+〉Na+.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 125 (1990), S. 263-280 
    ISSN: 1573-5036
    Keywords: Anthocephalus chinensis ; Eucalyptus × patentinervis ; E. saligna ; Hernandia sonora ; Hibiscus elatus ; Khaya nyasica ; litter ; Luquillo Experimental Forest ; nutrient cycling ; Pinus caribaea var. hondurensis ; P. elliottii var. densa ; Puerto Rico ; soil fertility ; Swietenia macrophylla ; Terminalia ivorensis ; tropical tree plantations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The importance of litter to nutrient and organic matter storage and the possible influence of species selection on soil fertility in ten stands each consisting of a separate tree species were examined in this study. The plantations had been grown under similar conditions in an arboretum in the Luquillo Experimental Forest, Puerto Rico. The species involved were: Anthocephalus chinensis, Eucalyptus × patentinervis, E. saligna, Hernandia sonora, Hibiscus elatus, Khaya nyasica, Pinus caribaea var. hondurensis, P. elliottii var. densa, Swietenia macrophylla, and Terminalia ivorensis. After 26 yr, litter mass ranged from 5 mg ha-1 in the H. sonora stand to 27.2 Mg ha-1 in the P. caribaea stand. Nutrients in the litter (N, P, K, Ca, and Mg) also varied widely, but stands were ranked in different order when ranked by nutrients in the litter than then ranked according to accumulation of mass. Only E. saligna and A. chinensis stands were ranked similarly in accumulation of both nutrients and mass, and the stand of H. elatus was ranked higher with respect to nutrient accumulation than to accumulation of mass. The nutrient concentration in standing leaf litter generally increased in the order of recently fallen 〈old intact〈 fragmented. Nutrient concentration of standing leaf litter appears to increase with age and depth in the litter layer. The amount of nutrients stored in the litter compartment of these plantations was in the same order of magnitude as the quantity of available nutrients in the top 10-cm of mineral soil. Total litter mass was negatively correlated with the mass-weighted concentration of N, K, and Mg. The same relationship was found for Ca in the leaf litter and N in the fine wood litter compartments. In some stands (notably P. caribaea, P. elliottii, and E. saligna), leaf litter derived from species other than the species planted in that particular stand had higher nutrient concentration than leaf litter from the planted species. Soils of the 10 stands were classified in the same soil series and had similar texture (clay soils). However, significantly different chemical characteristics were found. Results obtained by analysis of covariance and by limiting comparisons to adjacent stands with similar soil texture, indicate that different species have had different influences on the concentration of available nutrients in soil.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1573-5036
    Keywords: forest clearing ; forest succession ; Puerto Rico ; soil carbon ; soil nitrogen ; tropics ; U.S. Virgin Islands
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Soil samples from mature and secondary forests and agricultural sites in three subtropical life zones of Puerto Rico and the US Virgin Islands were collected to determine the effects of forest conversion to agriculture and succession on soil organic carbon (C) and nitrogen (N) contents. Site characteristics that may affect soil C and N (slope, elevation, aspect, and texture) were as uniform as possible. Carbon contents (to 50 cm depth or bedrock) of cultivated sites, as a percent of corresponding mature forests, were lower in the wet (44%) and moist (31%) than in the dry (86%) life zones whereas N contents were relatively high regardless of life zone (60–130% of the mature forests). Conversion of forests to pasture resulted in less soil C and N loss than conversion to crops. The time for recovery of soil C and N during succession was approximately the same in all three life zones, about 40–50 yr for C about 15–20 yr for N. However, the rate of recovery of soil C was faster in the wet and moist life zone, whereas N appeared to recover faster in the dry life zone. Evidence for loss of soil C during cultivation and gain during succession to soil depths of 50–100 cm is presented.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1573-5036
    Keywords: biomass ; litter fall ; litter standing stock ; organic matter budget ; Pinus caribaea plantations ; root biomass ; root production ; secondary forests ; soil organic matter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The distribution of tree biomass and the allocation of organic matter production were measured in an 11-yr-old Pinus caribaea plantation and a paired broadleaf secondary forest growing under the same climatic conditions. The pine plantation had significantly more mass aboveground than the secondary forest (94.9 vs 35.6 t ha-1 for biomass and 10.5 vs 5.0 t ha-1 for litter), whereas the secondary forest had significantly more fine roots (⩽2 mm diameter) than the pine plantation (10.5 and 1.0 t ha-1, respectively). Standing stock of dead fine roots was higher than aboveground litter in the secondary forest. In contrast, aboveground litter in pine was more than ten times higher than the dead root fraction. Both pine and secondary forests had similar total organic matter productions (19.2 and 19.4 t ha-1 yr-1, respectively) but structural allocation of that production was significantly different between the two forests; 44% of total production was allocated belowground in the secondary forest, whereas 94% was allocated aboveground in pine. The growth strategies represented by fast growth and large structural allocation aboveground, as for pine, and almost half the production allocated belowground, as for the secondary forest, illustrate equally successful, but contrasting growth strategies under the same climate, regardless of soil characteristics. The patterns of accumulation of organic matter in the soil profile indicated contrasting nutrient immobilization and mineralization sites and sources for soil organic matter formation.
    Type of Medium: Electronic Resource
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