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    • Rangeland Ecology & Management, Volume 60 (2007)
    • Rangeland Ecology & Management, Volume 60, Number 5 (September 2007)
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    Ecosystem Water Use Efficiency in a Semiarid Shrubland and Grassland Community

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    Author
    Emmerich, Wiliam E.
    Issue Date
    2007-09-01
    Keywords
    Bowen ratio
    carbon dioxide
    evapotranspiration
    EWUE
    
    Metadata
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    Citation
    Emmerich, W. E. (2007). Ecosystem water use efficiency in a semiarid shrubland and grassland community. Rangeland Ecology & Management, 60(5), 464-470.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/643180
    DOI
    10.2111/1551-5028(2007)60[464:EWUEIA]2.0.CO;2
    Additional Links
    https://rangelands.org/
    Abstract
    Ecosystem water use efficiency (EWUE) is defined as the net carbon uptake per amount of water lost from the ecosystem and is a useful measure of the functionality in semiarid shrub and grassland communities. C4 grasses have higher water use efficiency (WUE) than do C3 shrubs, although it has been postulated that C4 plants have lost much of their advantage due to the rising atmospheric CO2 concentrations. The hypothesis was that C4-grass-dominated ecosystems have a higher EWUE than C3-shrub- dominated ecosystems under the present CO2 concentration and climatic variability. Evapotranspiration (ET) and CO2 fluxes were measured with Bowen ratio systems at a shrub and grass site for 6 years in southeastern Arizona. Two different methods were used to evaluate growing season EWUE using the ET and CO2 fluxes. The first method estimated a net daytime growing season EWUE for the grass site at 1.74 g CO2 mm-1 ET and 1.28 g CO2 mm-1 ET at the shrub site. The second method estimated maximum EWUE during part of the growing season at 7.35 g CO2 mm-1 ET for the grass site and 4.68 g CO2 mm-1 ET for the shrub site, which was considered a significant difference at P=0.056. Data variability of the first method precluded a statistical difference determination between sites, but the results indicated that the grass-dominated ecosystem was between 1.4 and 1.6 times more water use efficient than the shrub-dominated ecosystem. Mean annual growing season precipitation and ET were similar in the two ecosystems, but the higher EWUE of the grassland system enabled it to take up more carbon during the growing season than the shrub ecosystem. Ecosystem differences in CO2 and H2O flux have important management implications including primary productivity, C sequestration, and rangeland health. 
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/1551-5028(2007)60[464:EWUEIA]2.0.CO;2
    Scopus Count
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    Rangeland Ecology & Management, Volume 60, Number 5 (September 2007)

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