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    • Journal of Range Management, Volume 48 (1995)
    • Journal of Range Management, Volume 48, Number 1 (January 1995)
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    Water budget for south Texas rangelands

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    Author
    Weltz, M. A.
    Blackburn, W. H.
    Issue Date
    1995-01-01
    Keywords
    water yield
    water balance
    evapotranspiration
    Prosopis glandulosa var. glandulosa
    rain
    runoff
    Texas
    drought
    rangelands
    grasses
    soil water
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    Citation
    Weltz, M. A., & Blackburn, W. H. (1995). Water budget for south Texas rangelands. Journal of Range Management, 48(1), 45-52.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644504
    DOI
    10.2307/4002503
    Additional Links
    https://rangelands.org/
    Abstract
    Understanding hydrologic processes is essential to determine if water yield augmentation is possible through vegetation manipulation. Nine large non-weighing lysimeters, each 35 m2, were installed on the La Copita Research Area, 20 km south of Alice, in the eastern Rio Grande Plain of Texas. The non-weighing lysimeters were used to test the hypothesis that honey mesquite (Prosopis glandulosa var glandulosa Torr.) shrub clusters have greater evapotranspiration rates than grass interspaces. Annual evapotranspiration rates of shrub clusters and grass interspaces were found to be similar, and both were significantly greater than evaporative losses from bare soil. Surface runoff and deep drainage of water (> 2 m) from the bare soil were significantly greater than from the grass interspaces and shrub clusters. There was no drainage of water below 2 m from the shrub clusters. A total of 22 mm of water percolated below 2 m from the grass interspace during the 18 month study period. These results indicate that no net change in the water budget would occur if shrub clusters were replaced with grasses in years with below average or normal rainfall. Increasing water yield from converting shrub-dominated rangelands to grass-dominated rangelands in south Texas is marginal in this area and limited to years when winter and spring rainfall exceeds potential evapotranspiration. There is little evidence to suggest that the minimal (non-significant difference) increase in percolation and surface runoff from the grass interspaces could be reliably captured and dependably made available off-site.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002503
    Scopus Count
    Collections
    Journal of Range Management, Volume 48, Number 1 (January 1995)

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