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    • Journal of Range Management, Volume 50 (1997)
    • Journal of Range Management, Volume 50, Number 3 (May 1997)
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    Viewpoint: atmospheric CO2, soil water, and shrub/grass ratios on rangelands

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    Author
    Polley, H. W.
    Mayeux, H. S.
    Johnson, H. B.
    Tischler, C. R.
    Issue Date
    1997-05-01
    Keywords
    prediction
    plant ecology
    water availability
    soil water balance
    carbon dioxide
    atmosphere
    greenhouse effect
    stomata
    C4 grasses
    rain
    transpiration
    shrubs
    rangelands
    literature reviews
    grasses
    plant height
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    Citation
    Polley, H. W., Mayeux, H. S., Johnson, H. B., & Tischler, C. R. (1997). Atmospheric CO2, soil water, and shrub/grass ratios on rangelands. Journal of Range Management, 50(3), 278-284.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644197
    DOI
    10.2307/4003730
    Additional Links
    https://rangelands.org/
    Abstract
    The abundance of woody plants on grasslands and savannas often is controlled by the availability of water and its location in soil. Water availability to plants is limited by precipitation, but the distribution of soil water and period over which it is available in these ecosystems are influenced by the transpiration rates of grasses. We discuss implications of recent and projected increases in atmospheric CO2 concentration for transpiration, soil water availability, and the balance of grasses and shrubs. An increase in CO2 concentration often reduces potential transpiration/leaf area by reducing stomatal conductance. On grasslands where effects of stomatal closure on transpiration are not negated by an increase in leaf temperature and leaf area, rising CO2 concentration should slow the depletion of soil water by grasses and potentially favor shrubs and other species that might otherwise succumb to water stress. Predicted effects of CO2 are supported by results from CO2-enrichment studies in the field and are compatible with recent models of interactions between resource levels and vegetation pattern and structure.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003730
    Scopus Count
    Collections
    Journal of Range Management, Volume 50, Number 3 (May 1997)

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