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    • Rangeland Ecology & Management, Volume 63 (2010)
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    Climate-Driven Interannual Variability in Net Ecosystem Exchange in the Northern Great Plains Grasslands

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    Author
    Zhang, Li
    Wylie, Bruce K.
    Ji, Lei
    Gilmanov, Tagir G.
    Tieszen, Larry L.
    Issue Date
    2010-01-01
    Keywords
    drought
    flux tower
    Moderate Resolute Imaging Spectroradiometer (MODIS)
    normalized difference vegetation index (NDVI)
    piecewise regression tree
    
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    Citation
    Zhang, L., Wylie, B. K., Ji, L., Gilmanov, T. G., & Tieszen, L. L. (2010). Climate-driven interannual variability in net ecosystem exchange in the northern Great Plains grasslands. Rangeland Ecology & Management, 63(1), 40-50.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/642763
    DOI
    10.2111/08-232.1
    Additional Links
    https://rangelands.org/
    Abstract
    The Northern Great Plains grasslands respond differently under various climatic conditions; however, there have been no detailed studies investigating the interannual variability in carbon exchange across the entire Northern Great Plains grassland ecosystem. We developed a piecewise regression model to integrate flux tower data with remotely sensed data and mapped the 8-d and 500-m net ecosystem exchange (NEE) for the years from 2000 to 2006. We studied the interannual variability of NEE, characterized the interannual NEE difference in climatically different years, and identified the drought impact on NEE. The results showed that NEE was highly variable in space and time across the 7 yr. Specifically, NEE was consistently low (–35 to 32 g C m-2 yr-1) with an average annual NEE of –2 +/- 24 g C m-2 yr-1 and a cumulative flux of –15 g C m-2. The Northern Great Plains grassland was a weak source for carbon during 2000-2006 because of frequent droughts, which strongly affected the carbon balance, especially in the Western High Plains and Northwestern Great Plains. Comparison of the NEE map with a drought monitor map confirmed a substantial correlation between drought and carbon dynamics. If drought severity or frequency increases in the future, the Northern Great Plains grasslands may become an even greater carbon source. 
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/08-232.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 63, Number 1 (January 2010)

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