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    • Journal of Range Management, Volume 40 (1987)
    • Journal of Range Management, Volume 40, Number 3 (May 1987)
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    Leaf Water Potential Trends in Three Grasses Native to Semiarid Argentina

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    Author
    Distel, R. A.
    Fernández, O. A.
    Issue Date
    1987-05-01
    Keywords
    pappophorum subbulbosum
    piptochaetium napostaense
    Stipa tenuis
    soil water potential
    drought tolerance
    relative humidity
    Poaceae
    leaf water potential
    semiarid zones
    Argentina
    rangelands
    Stipa
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    Citation
    Distel, R. A., & Fernández, O. A. (1987). Leaf water potential trends in three grasses native to semiarid Argentina. Journal of Range Management, 40(3), 203-207.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/645361
    DOI
    10.2307/3899079
    Additional Links
    https://rangelands.org/
    Abstract
    The natural grazing land of the semiarid region of central Argentina is subject to long and intense periods of drought during the hot season. The aim of the present study was to analyze the pattern of leaf water status for the cool-season grasses Piptochaetium napostaense and Stipa tenuis and the warm-season grass Pappophorum subbulbosum, which are important forage species in this grazing area. Leaf water potential, soil water potential, and relative humidity were measured during 1983 and 1984. At soil water potentials above -0.5 MPa, the leaf water potential of the 3 species showed high values at 0800, after nocturnal rehydratation, and minimum values at 1400, coincident with maximum atmospheric water demand. P. subbulbosum showed a greater capacity to withstand the drop in water potential at 1400 than did the cool-season species. During periods of low soil water potential the range of daily variation in leaf water potential was reduced in the 3 species because of marked decreases in the maximum and minimum values. Leaf water potential in the cool-season species correlated better with the deficit of atmospheric vapor pressure than with soil water potential. Leaf water potential of P. subbulbosum on the other hand showed a higher correlation with soil water potential than with atmospheric vapor pressure deficit.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/3899079
    Scopus Count
    Collections
    Journal of Range Management, Volume 40, Number 3 (May 1987)

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