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  • 1
    Online Resource
    Online Resource
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Keywords: Tundra ecology-Alaska-North Slope. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (447 pages)
    Edition: 1st ed.
    ISBN: 9783662011454
    Series Statement: Ecological Studies ; v.120
    DDC: 574.5/2644/097987
    Language: English
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  • 2
    Online Resource
    Online Resource
    San Diego :Elsevier Science & Technology,
    Keywords: Plant ecophysiology -- Arctic regions. ; Vegetation and climate -- Arctic regions. ; Vegetation dynamics -- Arctic regions. ; Plants -- Effect of global warming on. ; Electronic books.
    Description / Table of Contents: The arctic region is predicted to experience the earliest and most pronounced global warming response to human-induced climatic change. This book synthesizes information on the physiological ecology of arctic plants, discusses how physiological processes influence ecosystem processes, and explores how climate warming will affect arctic plants, plant communities, and ecosystem processes. Key Features * Reviews the physiological ecology of arctic plants * Explores biotic controls over community and ecosystems processes * Provides physiological bases for predicting how the Arctic will respond to global climate change.
    Type of Medium: Online Resource
    Pages: 1 online resource (490 pages)
    Edition: 1st ed.
    ISBN: 9780323138420
    Series Statement: Physiological Ecology Series
    DDC: 581.5/2621
    Language: English
    Note: Front Cover -- Arctic Ecosystems in a Changing Climate: An Ecophysiological Perspective -- Copyright Page -- Table of Contents -- Contributors -- Preface -- Introduction -- Chapter 1. Arctic Plant Physiological Ecology: A Challenge for the Future -- I. Introduction -- II. Physiological Ecology and Ecosystem Studies -- III. Physiological Ecology in the Arctic -- IV. Climate Change: A Theme for Arctic Physiological Ecology -- References -- Part I: The Arctic System -- Chapter 2. Arctic Climate: Potential for Change under Global Warming -- I. Introduction -- II. Present-Day Climate -- III. The Greenhouse Effect -- IV. Climate Models -- V. Implications for Snow, Permafrost, and Ice -- VI. Implications for Ecosystems -- VII. Summary -- References -- Chapter 3. Arctic Hydrology and Climate Change -- I. Introduction -- II. Watershed Structure -- III. Watershed Processes -- IV. Impact of Climatic Warming on Watershed Structure -- V. Hydrologic Response of an Arctic Watershed to Global Warming -- VI. Summary -- Acknowledgments -- References -- Chapter 4. Circumpolar Arctic Vegetation -- I. Introduction -- II. Forest-Tundra -- III. Low Arctic -- IV. High Arctic -- V. Arctic Carbon Reserves -- VI. Arctic Climate Change and Vegetation Patterns -- VII. Summary -- Acknowledgments -- References -- Chapter 5. Phytogeographic and Evolutionary Potential of the Arctic Flora and Vegetation in a Changing Climate -- I. Introduction -- II. Status and History of the Arctic Flora -- III. History of the Tundra Vegetation on the Alaskan North Slope -- IV. History of the Subarctic Vegetation in Central Alaska -- V. Floristic Richness along Latitudinal Gradients -- VI. Warmer Climates and Future Migrations -- VII. Summary -- References -- Chapter 6. Plant Succession, Competition, and the Physiological Constraints of Species in the Arctic -- I. Introduction. , II. Arctic Landscapes -- III. Models of Succession -- IV. Succession in the Low Arctic -- V. Succession in the High Arctic -- VI. Plant Competition -- VII. Summary -- Acknowledgments -- References -- Part II: Carbon Balance -- Chapter 7. Effects of Global Change on the Carbon Balance of Arctic Plants and Ecosystems -- I. Introduction -- II. Current Net Ecosystem Carbon Storage and Flux -- III. Effects of Global Change on Photosynthesis and Net Primary Productivity -- IV. Expected Effects of Global Change on Net Ecosystem Carbon Flux -- V. Summary and Conclusions -- References -- Chapter 8. Photosynthesis, Respiration, and Growth of Plants in the Soviet Arctic -- I. Introduction -- II. Photosynthesis -- III. Respiration and Growth -- IV. Summary and Conclusions -- References -- Chapter 9. Phenology, Resource Allocation, and Growth of Arctic Vascular Plants -- I. Introduction -- II. Phenology, Allocation, and Storage -- III. Growth Rates and Productivity -- IV. Conclusions -- V. Summary -- References -- Chapter 10. The Ecosystem Role of Poikilohydric Tundra Plants -- I. Introduction -- II. The Ecosystem Role of Mosses and Lichens -- III. Community Interactions and Poikilohydric Plants -- IV. Carbon Flows a s an Indicator of the Ecosystem Role of Poikilohydric Plants -- V. Summary -- Acknowledgments -- References -- Chapter 11. Arctic Tree Line in a Changing Climate -- I. Introduction -- II. Environmental Correlates of Tree Line -- III. Physiological Processes -- IV. Soil Processes -- V. Life History -- VI. Future Scenarios -- VII. Summary -- Acknowledgments -- References -- Part III: Water and Nutrient Balance -- Chapter 12. Water Relations of Arctic Vascular Plants -- I. The Importance of Water Stress -- II. Unique Aspects of the Arctic Environment -- III. Factors Influencing Plant Water Relations. , IV. Interactions between Water Relations and Whole-Plant Function -- V. Scaling Up from Leaf to Canopy Processes -- VI. Water Relations, Global Climate Change, and Ecosystem Processes -- VII. Arctic Plant Water Relations and the Biosphere -- VIII. Summary -- References -- Chapter 13. Microbial Processes and Plant Nutrient Availability in Arctic Soils -- I. Introduction -- II. Microbial and Soil Processes -- III. Soil Nitrogen and Phosphorus Cycling in a Warmer Arctic Climate -- IV. Summary -- Acknowledgments -- References -- Chapter 14. Nitrogen Fixation in Arctic Plant Communities -- I. Introduction -- II. Nitrogen Fixation Rates and Their Biological Importance in Arctic Ecosystems -- III. Environmental Controls -- IV. Climate Change, Nitrogen Fixation, and Arctic Ecosystem Processes -- V. Summary -- Acknowledgments -- References -- Chapter 15. Nutrient Absorption and Accumulation in Arctic Plants -- I. Introduction -- II. Response of Tundra Plants to the Environment -- III. Species and Growth-Form Differences -- IV. Uptake in the Field -- V. Role of Nutrient Uptake in Ecosystem Processes -- VI. Climate Change and Plant Nutrient Absorption -- VII. Summary -- References -- Chapter 16. Nutrient Use and Nutrient Cycling in Northern Ecosystems -- I. Introduction -- II. Storage and Recirculation of Nutrients or Additional Uptake? -- III. Nutrient Losses from the Plant -- IV. Impact of Dominant Plant Species on Nutrient Cycles -- V. Climate Change and Nutrient Cycles in Tundra Ecosystems -- VI. Summary -- Acknowledgments -- References -- Part IV: Interactions -- Chapter 17. Response of Tundra Plant Populations to Climatic Change -- I. Introduction -- II. Life Histories of Tundra Plants -- III. Demography at the Modular Level: Implications for Productivity -- IV. Demography at the Individual Level: Implications for Ecosystem Change. , V. Ecological Genetic Variation, Plasticity, and Ecosystem Change -- VI. Summary and Conclusions -- References -- Chapter 18. Controls over Secondary Metabolite Production by Arctic Woody Plants -- I. Introduction -- II. Environmental Controls of Secondary Metabolite Production -- III. Responses of Secondary Metabolite Production to Climate Change -- IV. Replacement of Tundra by Taiga -- V. Summary -- Acknowledgments -- References -- Chapter 19. Tundra Grazing Systems and Climatic Change -- I. Introduction -- II. Tundra Grazing Systems -- III. Comparisons among Tundra Grazing Systems -- IV. Tundra Grazing Systems and Climatic Change -- V. Summary -- Acknowledgments -- References -- Chapter 20. Modeling the Response of Arctic Plants to Changing Climate -- I. Introduction -- II. Scales and Types of Models -- III. Arctic Plant Growth Models -- IV. Critique of Models -- V. The Paradox of Model Complexity -- VI. A Strategy for Future Modeling -- VII. Summary -- Acknowledgments -- References -- Part V: Summary -- Chapter 21. Arctic Plant Physiological Ecology in an Ecosystem Context -- I. Ecophysiology of Individual Processes -- II. Physiological Ecology in an Ecosystem Context -- III. Physiological Ecology and Climate Change -- IV. Conclusion -- References -- Index.
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  • 3
    Publication Date: 2017-06-16
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 4
    Publication Date: 2022-05-25
    Description: Author Posting. © The Author(s), 2009. This is the author's version of the work. It is posted here by permission of Blackwell for personal use, not for redistribution. The definitive version was published in Ecology Letters 12 (2009): E15-E18, doi:10.1111/j.1461-0248.2009.01332.x.
    Description: Hartley et al. question whether reduction in Rmass, under experimental warming, arises because of the biomass method. We show the method they treat as independent yields the same result. We describe why the substrate-depletion hypothesis cannot alone explain observed responses, and urge caution in the interpretation of the seasonal data.
    Description: This research was supported by the Office of Science (BER), U.S. Department of Energy, the Andrew W. Mellon Foundation and U.S. National Science Foundation grants to the Coweeta LTER program.
    Keywords: Acclimation ; Adaptation ; Soil respiration ; Thermal biology ; Temperature ; Carbon cycling ; Climate change ; Climate warming ; Microbial community ; CO2
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
    Format: application/pdf
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  • 5
    Publication Date: 2022-05-25
    Description: Author Posting. © The Author(s), 2008. This is the author's version of the work. It is posted here by permission of Blackwell for personal use, not for redistribution. The definitive version was published in Ecology Letters 11 (2008): 1316-1327, doi:10.1111/j.1461-0248.2008.01251.x.
    Description: In the short-term heterotrophic soil respiration is strongly and positively related to temperature. In the long-term its response to temperature is uncertain. One reason for this is because in field experiments increases in respiration due to warming are relatively short-lived. The explanations proposed for this ephemeral response include depletion of fast-cycling, soil carbon pools and thermal adaptation of microbial respiration. Using a 〉15 year soil warming experiment in a mid-latitude forest, we show that the apparent ‘acclimation’ of soil respiration at the ecosystem scale results from combined effects of reductions in soil carbon pools and microbial biomass, and thermal adaptation of microbial respiration. Mass specific respiration rates were lower when seasonal temperatures were higher, suggesting that rate reductions under experimental warming likely occurred through temperature-induced changes in the microbial community. Our results imply that stimulatory effects of global temperature rise on soil respiration rates may be lower than currently predicted.
    Description: This research was supported by the Office of Science (BER), U.S. Department of Energy and the Andrew W. Mellon Foundation.
    Keywords: Acclimation ; Adaptation ; Soil respiration ; Thermal biology ; Temperature ; Carbon cycling ; Climate change ; Climate warming ; Microbial community ; CO2
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
    Format: application/pdf
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  • 6
    Publication Date: 2022-05-26
    Description: © The Author(s), 2016. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Environmental Research Letters 11 (2016): 034014, doi:10.1088/1748-9326/11/3/034014.
    Description: As the permafrost region warms, its large organic carbon pool will be increasingly vulnerable to decomposition, combustion, and hydrologic export. Models predict that some portion of this release will be offset by increased production of Arctic and boreal biomass; however, the lack of robust estimates of net carbon balance increases the risk of further overshooting international emissions targets. Precise empirical or model-based assessments of the critical factors driving carbon balance are unlikely in the near future, so to address this gap, we present estimates from 98 permafrost-region experts of the response of biomass, wildfire, and hydrologic carbon flux to climate change. Results suggest that contrary to model projections, total permafrost-region biomass could decrease due to water stress and disturbance, factors that are not adequately incorporated in current models. Assessments indicate that end-of-the-century organic carbon release from Arctic rivers and collapsing coastlines could increase by 75% while carbon loss via burning could increase four-fold. Experts identified water balance, shifts in vegetation community, and permafrost degradation as the key sources of uncertainty in predicting future system response. In combination with previous findings, results suggest the permafrost region will become a carbon source to the atmosphere by 2100 regardless of warming scenario but that 65%–85% of permafrost carbon release can still be avoided if human emissions are actively reduced.
    Description: This work was supported by the National Science Foundation ARCSS program and Vulnerability of Permafrost Carbon Research Coordination Network (grants OPP-0806465, OPP-0806394, and 955713) with additional funding from SITES (Swedish Science Foundation), Future Forest (Mistra), and a Marie Curie International Reintegration Grant (TOMCAR-Permafrost #277059) within the 7th European Community Framework Programme.
    Repository Name: Woods Hole Open Access Server
    Type: Article
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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: We use a spatially explicit landscape model to investigate the potential role of rainfall on shrub–grass transitions in the Jornada Basin of southern New Mexico during the past century. In long-term simulations (1915–1998) along a 2700 m transect running from a dry lake bed to the foothills of a small mountain, we test two hypotheses: (i) that wetter winters and drier summers may have facilitated shrub encroachment in grasslands, and (ii) that increases in large precipitation events may have increased soil water recharge at deeper layers, thus favoring shrub establishment and growth. Our model simulations generally support the hypothesis that wetter winters and drier summers may have played a key role, but we are unable to reproduce the major shifts from grass- to shrub-domination that occurred in this landscape during the early part of the 1900s; furthermore, the positive shrub response to wetter winters and drier summers was only realized subsequent to the drought of 1951–1956, which was a relatively short ‘window of opportunity’ for increased shrub establishment and growth. Our simulations also generally support the hypothesis that an increase in the number of large precipitation events may also have favored shrub establishment and growth, although these results are equivocal, depending upon what constitutes a ‘large’ event and the timing of such events. We found complex interactions among (i) the amount/seasonality of rainfall, (ii) its redistribution in the landscape via run-on and runoff, (iii) the depth of the soil water recharge, and (iv) subsequent water availability for the growth and reproduction of shrubs vs. herbaceous plants at various landscape positions. Our results suggest that only a mechanistic understanding of these interactions, plus the role of domestic cattle grazing, will enable us to elucidate fully the relative importance of biotic vs. abiotic factors in vegetation dynamics in this semiarid landscape.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In previous papers we have described and verified a primary production model of the desert shrub Larrea tridentata. Here we address the validation phase of the evaluation of this model. Two versions of the model which differ in the priority scheme used for allocating carbon to reproductive or vegetative organs were compared on the basis of their usefulness and reliability over a range of soil-moisture conditions. Over an entire growing season when soil-moisture conditions were near “normal” both versions of the model were adequate predictors of total above-ground vegetative growth and one was an adequate predictor of reproductive growth as well. A more detailed analysis revealed that the versions varied in the range of soil-moisture conditions over which they were adequate and that neither was adequate when soil-moisture had remained high for extended periods. The validation process has revealed some likely areas for model improvement to increase adequacy.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Landscape ecology 8 (1993), S. 155-162 
    ISSN: 1572-9761
    Keywords: Contagion index ; spatial pattern ; probability ; information index ; landscape ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A contagion index was proposed by O'Neill et al. (1988) to quantify spatial patterns of landscapes. However, this index is insensitive to changes in spatial pattern. We present a new contagion index that corrects an error in the mathematical formulation of the original contagion index. The error is identified mathematically. The contagion indices (both original and new) are then evaluated against simulated landscapes.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Landscape ecology 13 (1998), S. 187-201 
    ISSN: 1572-9761
    Keywords: vegetation pattern ; tussock tundra ; landscapes ; topography ; water drainage ; scaling up
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We present a topographically-derived vegetation model (TVM) that predicts the landscape patterns of arctic vegetation types in the foothills of the Brooks Range in northern Alaska. In the Arctic there is a strong relationship between water and plant structure and function and TVM is based on the relationships between vegetation types and slope (tan β) and discharge (δ), two independent variables that can be easily derived from digital terrain data. Both slope and discharge relate to hydrological similarity within a landscape: slope determines the gravitational hydrological gradient and hence influences flow velocity, whereas discharge patterns are computed based on upslope area and quantify lateral flow amount. TVM was developed and parameterized based on vegetation data from a small 2.2 km2 watershed and its application was tested in a larger 22km2 region. For the watershed, TVM performed quite well, having a high spatial resolution and a goodness-of-fit ranging from 71–78%, depending on the functions used. For the larger region, the strength of the vegetation types predictions drops somewhat to between 56–59%. We discuss the various sources of error and limitations of the model for purposes of extrapolation.
    Type of Medium: Electronic Resource
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