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    • Journal of Range Management, Volume 49 (1996)
    • Journal of Range Management, Volume 49, Number 3 (May 1996)
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    Evaluation of a site conservation rating system in southeastern Arizona

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    Author
    Watters, S. E.
    Weltz, M. A.
    Smith, E. L.
    Issue Date
    1996-05-01
    Keywords
    water erosion
    rill erosion
    ground cover
    semiarid grasslands
    highlands
    mathematical models
    loam soils
    clay soils
    range condition
    rain
    biomass
    sediment yield
    range management
    plant litter
    Arizona
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    Citation
    Watters, S. E., Weltz, M. A., & Smith, E. L. (1996). Evaluation of a site conservation rating system in southeastern Arizona. Journal of Range Management, 49(3), 277-284.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644252
    DOI
    10.2307/4002891
    Additional Links
    https://rangelands.org/
    Abstract
    The objectives of this study were to identify a Site Conservation Threshold, the point at which accelerated erosion occurs, and to examine the usefulness of the Water Erosion Prediction Project (WEPP) model in determining the Site Conservation Threshold on a clay loam upland rangeland site. Sixteen sample sites were chosen to represent a wide range of species composition, ground cover, biomass and apparent soil stability to determine which of these factors could be used to evaluate the site conservation status of a clay-loam upland ecological site on a southern Arizona semi-arid desert grassland. A Site Stability Rating based on observable vegetation and soil-surface characteristics (i.e. ground surface cover and distribution of plants) was developed. A Site Stability Rating was estimated for 100 quadrats per sample site and averaged for the entire sample site. The Water Erosion Prediction Project model was used as an objective index of soil stability to assess the degree of site protection. The Soil Conservation Service soil loss tolerance value (T) was used with the sediment yield predicted by the WEPP model to establish a threshold value for the Site Stability Rating. The objective measures of standing biomass, basal cover, average distance to the nearest perennial plant, and frequency of quadrats with no rooted perennial plant showed strong relationships to the subjective Site Stability Rating. Site Conservation Thresholds were identified for standing biomass (750 kg/ha), basal cover (8%), average distance to the nearest perennial plant (15 cm), and frequency of quadrats (20 X 20 cm) with no rooted perennial plant (13%).
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002891
    Scopus Count
    Collections
    Journal of Range Management, Volume 49, Number 3 (May 1996)

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