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  • 1
    Monograph available for loan
    Monograph available for loan
    New York, London : Chapman and Hall
    Call number: PIK N 630-93-0007
    Type of Medium: Monograph available for loan
    Pages: 338 p.
    ISBN: 0412036711 , 0-412-03681-9
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    Cambridge : Cambridge University Press
    Call number: PIK N 531-98-0160
    Type of Medium: Monograph available for loan
    Pages: 568 p.
    Edition: 1. ed.
    ISBN: 0521565235
    Series Statement: Cambridge Studies in Ecology ;
    Location: A 18 - must be ordered
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  • 3
    Monograph available for loan
    Monograph available for loan
    New York, N.Y. [u.a.] : Springer
    Call number: PIK N 630-91-0104
    Type of Medium: Monograph available for loan
    Pages: XIV, 278 S. : Ill., graph. Darst.
    ISBN: 0387960007 , 3-540-96000-7
    Location: A 18 - must be ordered
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  • 4
    Monograph available for loan
    Monograph available for loan
    Cambridge [u.a.] : Cambridge University Press
    Call number: PIK N 630-92-0506 ; AWI G3-98-0148
    Description / Table of Contents: The boreal forests of the world, occupying some 15 million square kilometers over North America and Eurasia, are a major source of softwood timber and are expected to play a significant role in the response of vegetation to global climate change. This book, developed by an international panel of ecologists, provides a synthesis of the important patterns and processes that occur in boreal forests and reviews the principal mechanisms that control the forest's pattern in space and time. The effects of low temperatures, soil ice, insects, plant competition, wild-fires and climatic change on boreal forests are discussed as a basis for the development of the first global scale computer model of the dynamical change of a biome, able to project the change of the boreal forest over timescales of decades to millennia, and over the global extent of this forest.
    Type of Medium: Monograph available for loan
    Pages: XI, 565 S. : graph. Darst.
    ISBN: 0521405467
    Language: English
    Note: Contents: List of contributors. - 1 Introduction / Herman H. Shugart, Rik Leemans and Gordon B. Bonan. - Part 1 Processes in boreal forests. - 2 Silvics of the circumpolar boreal forest tree species / Nedialko Nikolov and Harry Helmisaari. - 3 The reproductive process in boreal forest trees / John C. Zasada, Terry L. Sharik and Markku Nygren. - 4 Soil temperature as an ecological factor in boreal forests / Gordon B. Bonan. - 5 Fire as a controlling process in the North American boreal forest / Serge Payette. - 6 The role of forest insects in structuring the boreal landscape / C. S. Holling. - Part 2 Patterns in space and time in boreal forests. - 7 The transition between boreal forest and tundra / Luc Sirois. - 8 The southern boreal-northern hardwood forest border / John Pastor and David J. Mladenoff. - 9 Transitions between boreal forest and wetland / F. Z. Glebov and M. D. Korzukhin. - 10 Remote sensing technology for forest ecosystem analysis / K. Jon Ranson and Darrel L. Williams. - 11 The nature and distribution of past, present and future boreal forests: lessons for a research and modeling agenda / Allen M. Solomon. - Part 3 Computer models for synthesis of pattern and process in the boreal forest. - 12 Individual-tree-based models of forest dynamics and their application in global change research / Herman H. Shugart and I. Colin Prentice. - 13 Population-level models of forest dynamics / M. D.Korzukhin and M. Ya. Antonovski. - 14 A spatial model of long-term forest fire dynamics and its applications to forests in western Siberia / M. Ya. Antonovski, M. T. Ter-Mikaelian and V. V. Furyaev. - 15 A simulation analysis of environmental factors and ecological processes in North American boreal forests / Gordon B. Bonan. - 16 The biological component of the simulation model for boreal forest dynamics / Rik Leemans. - 17 Role of stand simulation in modeling forest response to environmental change and management interventions / Peter Duinker, Ola Salinäs and Sten Nilsson. - 18 Concluding comments / Herman H. Shugart, Rik Leemans and Gordon B. Bonan. - References. - Index.
    Location: A 18 - must be ordered
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    Branch Library: AWI Library
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  • 5
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Understanding patterns of biodiversity distribution is essential to conservation strategies, but severe data constraints make surrogate measures necessary. For this reason, many studies have tested the performance of terrestrial vertebrates as surrogates for overall species diversity, but these ...
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  • 6
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: Nitrogen (N) cycling was analyzed in the Kalahari region of southern Africa, where a strong precipitation gradient (from 978 to 230 mm mean annual precipitation) is the main variable affecting vegetation. The region is underlain by a homogeneous soil substrate, the Kalahari sands, and provides the opportunity to analyze climate effects on nutrient cycling. Soil and plant N pools, 15N natural abundance (δ15N), and soil NO emissions were measured to indicate patterns of N cycling along a precipitation gradient. The importance of biogenic N2 fixation associated with vascular plants was estimated with foliar δ15N and the basal area of leguminous plants. Soil and plant N was more 15N enriched in arid than in humid areas, and the relation was steeper in samples collected during wet than during dry years. This indicates a strong effect of annual precipitation variability on N cycling. Soil organic carbon and C/N decreased with aridity, and soil N was influenced by plant functional types. Biogenic N2 fixation associated with vascular plants was more important in humid areas. Nitrogen fixation associated with trees and shrubs was almost absent in arid areas, even though Mimosoideae species dominate. Soil NO emissions increased with temperature and moisture and were therefore estimated to be lower in drier areas. The isotopic pattern observed in the Kalahari (15N enrichment with aridity) agrees with the lower soil organic matter, soil C/N, and N2 fixation found in arid areas. However, the estimated NO emissions would cause an opposite pattern in δ15N, suggesting that other processes, such as internal recycling and ammonia volatilization, may also affect isotopic signatures. This study indicates that spatial, and mainly temporal, variability of precipitation play a key role on N cycling and isotopic signatures in the soil–plant system.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: Vegetation occurs at its highest elevations on equatorial mountains. Inspection of archival and recent high-resolution reconnaissance imagery of tropical mountains shows, in all cases, features indicating an increase in the elevation of mountain vegetation zones and an increase in vigour in the high-elevation vegetation. These changes are consistent with an increased plant performance from increased levels of carbon dioxide in the atmosphere as well as with a warmer or more favourable climate.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 120 (1999), S. 405-415 
    ISSN: 1432-1939
    Keywords: Key words Nitrogen dynamics ; Nitrogen isotope ratio ; Computer modeling ; Mycorrhizal fungi ; Plant succession
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nitrogen cycling in forest soils has been intensively studied for many years because nitrogen is often the limiting nutrient for forest growth. Complex interactions between soil, microbes, and plants and the consequent inability to correlate δ15N changes with biologic processes have limited the use of natural abundances of nitrogen isotopes to study nitrogen (N) dynamics. During an investigation of N dynamics along the 250-year-old successional sequence in Glacier Bay, Alaska, United States, we observed several puzzling isotopic patterns, including a consistent decline in δ15N of the late successional dominant Picea at older sites, a lack of agreement between mineral N δ15N and foliar δ15N, and high isotopic signatures for mycorrhizal fungi. In order to understand the mechanisms creating these patterns, we developed a model of N dynamics and N isotopes (Nitrogen Isotope Fluxes in Terrestrial Ecosystems, NIFTE), which simulated the major transformations of the N cycle and predicted isotopic signatures of different plant species and soil pools. Comparisons with field data from five sites along the successional sequence indicated that NIFTE can duplicate observed patterns in δ15N of soil, foliage, and mineral N over time. Different scenarios that could account for the observed isotopic patterns were tested in model simulations. Possible mechanisms included increased isotopic fractionation on mineralization, fractionation during the transfer of nitrogen from mycorrhizal fungi to plants, variable fractionation on uptake by mycorrhizal fungi compared to plants, no fractionation on mycorrhizal transfer, and elimination of mycorrhizal fungi as a pool in the model. The model results suggest that fractionation during mineralization must be small (˜2‰), and that no fractionation occurs during plant or mycorrhizal uptake. A net fractionation during mycorrhizal transfer of nitrogen to vegetation provided the best fit to isotopic data on mineral N, plants, soils, and mycorrhizal fungi. The model and field results indicate that the importance of mycorrhizal fungi to N uptake is probably less under conditions of high N availability. Use of this model should encourage a more rigorous assessment of isotopic signatures in ecosystem studies and provide insights into the biologic transformations which affect those signatures. This should lead to an enhanced understanding of some of the fundamental controls on nitrogen dynamics.
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  • 9
    ISSN: 1432-1939
    Keywords: Key words Nitrogen dynamics ; Nitrogen isotope ratio ; Carbon isotope ratio ; Mycorrhizal fungi ; Succession
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The successful use of natural abundances of carbon (C) and nitrogen (N) isotopes in the study of ecosystem dynamics suggests that isotopic measurements could yield new insights into the role of fungi in nitrogen and carbon cycling. Sporocarps of mycorrhizal and saprotrophic fungi, vegetation, and soils were collected in young, deciduous-dominated sites and older, coniferous-dominated sites along a successional sequence at Glacier Bay National Park, Alaska. Mycorrhizal fungi had consistently higher δ15N and lower δ13C values than saprotrophic fungi. Foliar δ13C values were always isotopically depleted relative to both fungal types. Foliar δ15N values were usually, but not always, more depleted than those in saprotrophic fungi, and were consistently more depleted than in mycorrhizal fungi. We hypothesize that an apparent isotopic fractionation by mycorrhizal fungi during the transfer of nitrogen to plants may be attributed to enzymatic reactions within the fungi producing isotopically depleted amino acids, which are subsequently passed on to plant symbionts. An increasing difference between soil mineral nitrogen δ15N and foliar δ15N in later succession might therefore be a consequence of greater reliance on mycorrhizal symbionts for nitrogen supply under nitrogen-limited conditions. Carbon signatures of mycorrhizal fungi may be more enriched than those of foliage because the fungi use isotopically enriched photosynthate such as simple sugars, in contrast to the mixture of compounds present in leaves. In addition, some 13C fractionation may occur during transport processes from leaves to roots, and during fungal chitin biosynthesis. Stable isotopes have the potential to help clarify the role of fungi in ecosystem processes.
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  • 10
    ISSN: 1572-9761
    Keywords: remote sensing ; AVHRR ; breeding habitat ; habitat suitability ; East Africa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Data derived from the Advanced Very High Resolution Radiometer (AVHRR) on board the NOAA series of operational, polar orbiting, meteorological satellites have previously been shown to be quite useful for monitoring vegetation dynamics at scales ranging from regional (104 km2) to global. In this report, we demonstrate that these same data can be used to monitor potential breeding habitat for a highly mobile, granivorous African weaver-bird, the red-billed quelea (Quelea quelea). This species is often considered to be an agricultural pest, affecting cereal production throughout sub-Saharan Africa. The temporal resolution and very large (continental) spatial coverage provided by these data can provide a unique context within which to examine species distribution and abundance patterns.
    Type of Medium: Electronic Resource
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