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    • Rangeland Ecology & Management, Volume 59, Number 6 (November 2006)
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    Long-Term Dynamics of Production, Respiration, and Net CO2 Exchange in Two Sagebrush-Steppe Ecosystems

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    Author
    Gilmanov, Tagir G.
    Svejcar, Tony J.
    Johnson, Douglas A.
    Angell, Raymond F.
    Saliendra, Nicanor Z.
    Wylie, Bruce K.
    Issue Date
    2006-11-01
    Keywords
    CO2 flux tower measurements
    gross primary production
    ecosystem respiration
    flux partitioning
    daytime respiration
    nighttime respiration
    light-response function method
    US Intermountain West
    
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    Citation
    Gilmanov, T. G., Svejcar, T. J., Johnson, D. A., Angell, R. F., Saliendra, N. Z., & Wylie, B. K. (2006). Long-term dynamics of production, respiration, and net CO2 exchange in two sagebrush-steppe ecosystems. Rangeland Ecology & Management, 59(6), 585-599.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/643112
    DOI
    10.2111/05-198R1.1
    Additional Links
    https://rangelands.org/
    Abstract
    We present a synthesis of long-term measurements of CO2 exchange in 2 US Intermountain West sagebrush-steppe ecosystems. The locations near Burns, Oregon (1995-2001), and Dubois, Idaho (1996-2001), are part of the AgriFlux Network of the Agricultural Research Service, United States Department of Agriculture. Measurements of net ecosystem CO2 exchange (Fc) during the growing season were continuously recorded at flux towers using the Bowen ratio-energy balance technique. Data were partitioned into gross primary productivity (Pg) and ecosystem respiration (Re) using the light-response function method. Wintertime fluxes were measured during 1999/2000 and 2000/2001 and used to model fluxes in other winters. Comparison of daytime respiration derived from light-response analysis with nighttime tower measurements showed close correlation, with daytime respiration being on the average higher than nighttime respiration. Maxima of Pg and Re at Burns were both 20 g CO2 m2 d-1 in 1998. Maxima of Pg and Re at Dubois were 37 and 35 g CO2 m-2 d-1, respectively, in 1997. Mean annual gross primary production at Burns was 1 111 (range 475-1 715) g CO2 m-2 y-1 or about 30% lower than that at Dubois (1 602, range 963-2 162 g CO2 m-2 y-1). Across the years, both ecosystems were net sinks for atmospheric CO2 with a mean net ecosystem CO2 exchange of 82 g CO2 m-2 y-1 at Burns and 253 g CO-2 m-2 y-1 at Dubois, but on a yearly basis either site could be a C sink or source, mostly depending on precipitation timing and amount. Total annual precipitation is not a good predictor of carbon sequestration across sites. Our results suggest that Fc should be partitioned into Pg and Re components to allow prediction of seasonal and yearly dynamics of CO2 fluxes. 
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/05-198R1.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 59, Number 6 (November 2006)

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