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    Carbon, water, and energy fluxes in a semiarid cold desert grassland during and following multiyear drought

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    2010JG001322.pdf (1.457Mb)
    Date
    2010-11-18
    Author
    Bowling, D. R.  Concept link
    Bethers-Marchetti, S.  Concept link
    Lunch, Claire K.  Concept link
    Grote, E. E.  Concept link
    Belnap, J.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4214
    As published
    https://doi.org/10.1029/2010JG001322
    DOI
    10.1029/2010JG001322
    Keyword
     Perennial bunchgrass; North American monsoon; Net ecosystem exchange; Hilaria jamesii; Stipa hymenoides 
    Abstract
    The net exchanges of carbon dioxide, water vapor, and energy were examined in a perennial Colorado Plateau grassland for 5 years. The study began within a multiyear drought and continued as the drought ended. The grassland is located near the northern boundary of the influence of the North American monsoon, a major climatic feature bringing summer rain. Following rain, evapotranspiration peaked above 8 mm d−1 but was usually much smaller (2–4 mm d−1). Net productivity of the grassland was low compared to other ecosystems, with peak hourly net CO2 uptake in the spring of 4 μmol m−2 s−1 and springtime carbon gain in the range of 42 ± 11 g C m−2 (based on fluxes) to 72 ± 55 g C m−2 (based on carbon stocks; annual carbon gain was not quantified). Drought decreased gross ecosystem productivity (GEP) and total ecosystem respiration, with a much larger GEP decrease. Monsoon rains led to respiratory pulses, lasting a few days at most, and only rarely resulted in net CO2 gain, despite the fact that C4 grasses dominated plant cover. Minor CO2 uptake was observed in fall following rain. Spring CO2 uptake was regulated by deep soil moisture, which depended on precipitation in the prior fall and winter. The lack of CO2 uptake during the monsoon and the dependence of GEP on deep soil moisture are in contrast with arid grasslands of the warm deserts. Cold desert grasslands are most likely to be impacted by future changes in winter and not summer precipitation.
    Description
    Author Posting. © American Geophysical Union, 2010. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 115 (2010): G04026, doi:10.1029/2010JG001322.
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    • Ecosystems Center
    Suggested Citation
    Journal of Geophysical Research 115 (2010): G04026
     

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