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    • Journal of Range Management, Volume 45 (1992)
    • Journal of Range Management, Volume 45, Number 1 (January 1992)
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    A model of woody-herbaceous biomass relationships in eucalypt and mesquite communities

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    Author
    Scanlan, J. C.
    Issue Date
    1992-01-01
    Keywords
    Eucalyptus
    eucalyptus crebra
    Australia
    simulation models
    Prosopis glandulosa
    competitive ability
    understory
    mathematical models
    biomass production
    plant communities
    
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    Citation
    Scanlan, J. C. (1992). A model of woody-herbaceous biomass relationships in eucalypt and mesquite communities. Journal of Range Management, 45(1), 75-80.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644666
    DOI
    10.2307/4002530
    Additional Links
    https://rangelands.org/
    Abstract
    A spatial simulation model was developed to examine the community-level relationships between woody overstory and herbaceous understory. The influences of individual trees on herbaceous understory were aggregated into stimulatory and competitive effects which were represented as indices. The net index at a particular point on the landscape was calculated by multiplying the indices of all trees having an effect at that point. Simulated sampling of computer-generated communities (calculating the net index at a number of randomly selected points) enabled the herbaceous production to be estimated for communities of defined tree density and size. The model was parameterized for eucalypt (Eucalyptus crebra F. Muell.) communities in northeastern Australia and for honey mesquite (Prosopis glandulosa var glandulosa Torr.)-mixed brush areas in southwestern U.S.A. When a net competitive effect exists around individual trees, a negative curvilinear relationship between herbaceous yield and tree density was observed in the simulations. If stimulatory effects dominate at the individual tree level, herbaceous yield at the community level was highest at intermediate tree densities. Thus the extremes of relationships seen in the literature can be reproduced simply by altering the relative strength of stimulation and competition in this model. The model can be used to examine the change in herbaceous yield at the community level following manipulation of woody cover.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002530
    Scopus Count
    Collections
    Journal of Range Management, Volume 45, Number 1 (January 1992)

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