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    The sensitivity of carbon exchanges in Great Plains grasslands to precipitation variability

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    Petrie_AGU_2016.pdf (1.423Mb)
    Issue Date
    2016-02-02
    Author
    Petrie, Matthew D.
    Brunsell, Nathaniel A.
    Vargas, R.
    Collins, S. L.
    Flanagan, L. B.
    Hanan, N. P.
    Litvak, Marcy E.
    Suyker, A. E.
    Publisher
    American Geophysical Union
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Rights
    ©2016. American Geophysical Union. All Rights Reserved.
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    Abstract
    In the Great Plains, grassland carbon dynamics differ across broad gradients of precipitation and temperature, yet finer-scale variation in these variables may also affect grassland processes. Despite the importance of grasslands, there is little information on how fine-scale relationships compare between them regionally. We compared grassland C exchanges, energy partitioning and precipitation variability in eight sites in the eastern and western Great Plains using eddy covariance and meteorological data. During our study, both eastern and western grasslands varied between an average net carbon sink and a net source. Eastern grasslands had a moderate vapor pressure deficit (VPD = 0.95 kPa) and high growing season gross primary productivity (GPP = 1010 ± 218 g C m−2 yr−1). Western grasslands had a growing season with higher VPD (1.43 kPa) and lower GPP (360 ± 127 g C m−2 yr−1). Western grasslands were sensitive to precipitation at daily timescales, whereas eastern grasslands were sensitive at monthly and seasonal timescales. Our results support the expectation that C exchanges in these grasslands differ as a result of varying precipitation regimes. Because eastern grasslands are less influenced by short-term variability in rainfall than western grasslands, the effects of precipitation change are likely to be more predictable in eastern grasslands because the timescales of variability that must be resolved are relatively longer. We postulate increasing regional heterogeneity in grassland C exchanges in the Great Plains in coming decades.
    URI
    http://hdl.handle.net/1808/25249
    DOI
    https://doi.org/10.1002/2015JG003205
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    • Geography & Atmospheric Science Scholarly Works [199]
    Citation
    Petrie, M. D., N. A. Brunsell, R. Vargas,S. L. Collins, L. B. Flanagan, N. P. Hanan,M. E. Litvak, and A. E. Suyker (2016),The sensitivity of carbon exchangesin Great Plains grasslands toprecipitation variability, J. Geophys.Res. Biogeosci., 121, 280–294,doi:10.1002/2015JG003205.

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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