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    • Journal of Range Management, Volume 50 (1997)
    • Journal of Range Management, Volume 50, Number 5 (September 1997)
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    Browsing and tree size influences on Ashe juniper understory

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    Author
    Fuhlendorf, S. D.
    Smeins, F. E.
    Taylor, C. A.
    Issue Date
    1997-09-01
    Keywords
    browse line
    light penetration
    size
    Juniperus ashei
    understory
    Odocoileus virginianus
    stocking rate
    goats
    Texas
    plant litter
    botanical composition
    canopy
    browsing
    grasses
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    Citation
    Fuhlendorf, S. D., Smeins, F. E., & Taylor, C. A. (1997). Browsing and tree size influences on Ashe juniper understory. Journal of Range Management, 50(5), 507-512.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644060
    DOI
    10.2307/4003706
    Additional Links
    https://rangelands.org/
    Abstract
    Ashe juniper (Junius ashei, Buckholz) is increasing on most sites across the Edwards Plateau of Texas. It is the purpose of this investigation to document the influence of Ashe juniper tree size on understory vegetation and to evaluate how the interaction between tree size and browsing by domestic and white-tailed deer modifies overstory-understory relationships. Trees were randomly selected from 2 long-term treatments (browsed and unbrowsed) and analysed with univariate analysis of covariance and multivariate repeated-measures analysis. Without browsing, Ashe juniper is more abundant and its individual influence increases as the size of the tree increases; trees with a canopy diameter < 6.0 m expressed minimal influence on understory vegetation compared to larger trees. When browsers are present at sufficient stocking rates to create a browse line on large trees, encroachment of Ashe juniper is slowed, rate of increase of all woody speces is reduced, and large trees cause a shift in species composition directly under the canopy, however cover of all herbaceous species is not reduced. Immediately under the canopy of small browsed trees, herbaceous cover is lower than for unbrowsed trees. Environmental variables rpsponsible for these patterns were litter depth and light penetrating the canopy when the sun is at an angle (during the winter). The increased cover of several herbaceous species under the canopy of large browsed trees and at the canopy edge of browsed and unbrowsed trees, indicates the importance of the interaction between canopy cover and the presence of a browse line. Browse lines on large trees enhance growth and production of cool season species, such as Texas wintergrass (Stipa leucotricha Trin. & Rupr.) and reduce negative influences (low light, thick leaf litter, etc.) on other herbaceous species. At this level of browsing many other palatable species could be reduced or lost from the plant comunity.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003706
    Scopus Count
    Collections
    Journal of Range Management, Volume 50, Number 5 (September 1997)

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