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    Shifts in Arctic Vegetation May Fuel Feedbacks to Climate Change in Peatland Regions

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    Author
    Vining, Sarah Rose
    Issue Date
    2017
    Advisor
    Saleska, Scott
    
    Metadata
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    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Changing sub‐Arctic plant communities can be an important feedback to climate change, via shifts in quantity and quality of litter production. Litter inputs to soil have appreciable influence on soil organic matter and microbial dynamics and consequently may provide a feedback to climate change in the sub‐Arctic. As permafrost peatlands thaw in response to climate change, the community composition of vegetation has been observed to shift from smaller and woodier shrubs to larger, more biodegradable sedges. We tested the hypothesis that carbon (C) stored in plant biomass increases across a permafrost thaw gradient by sampling both above‐ and below‐ground biomass in a permafrost‐underlain palsa, partially thawed bog, and fully thawed fen, all at Stordalen Mire in northern Sweden. Surprisingly, we found that total above‐ and below‐ground biomass together do not significantly change from the intact to the fully‐thawed habitats, despite previous research showing that net ecosystem productivity (NEP) appears to be higher in the fully thawed inundated fen. The lack of observed biomass increase despite the increase in NEP observed in other studies could be explained if the higher productivity sedges in fen sites have higher turnover, and transfer that productivity to SOM through high root exudation and/or litter deposition. We also observed a shift in plant community composition associated with loss of plant biodiversity across the gradient. These results suggest that plant community succession alters the quantity, type, and diversity of plant litter inputs to the soil. Such changes in litter quantity and type may be important drivers of decomposition rates and therefore the status of the ecosystem as a source versus sink for atmospheric C.
    Type
    text
    Electronic Thesis
    Degree Name
    B.S.
    Degree Level
    bachelors
    Degree Program
    Honors College
    Environmental Science
    Degree Grantor
    University of Arizona
    Collections
    Honors Theses

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