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    • Journal of Range Management, Volume 41 (1988)
    • Journal of Range Management, Volume 41, Number 6 (November 1988)
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    Defoliation of Thurber needlegrass: herbage and root responses

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    Author
    Ganskopp, D.
    Issue Date
    1988-11-01
    Keywords
    Achnatherum thurberianum
    roots
    stocking rate
    regrowth
    Oregon
    range management
    phenology
    rangelands
    defoliation
    livestock
    grazing
    forage
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    Citation
    Ganskopp, D. (1988). Defoliation of Thurber needlegrass: herbage and root responses. Journal of Range Management, 41(6), 472-476.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644996
    DOI
    10.2307/3899519
    Additional Links
    https://rangelands.org/
    Abstract
    Thurber needlegrass (Stipa thurberiana Piper) is an important component of both forested and shrub-steppe communities of the Pacific Northwest and Great Basin regions, and little is known of its tolerance to defoliation. A study was conducted on the Squaw Butte Experimental Range to determine the response of containerized Thurber needlegrass to single defoliations (2.5-cm stubble) throughout the growing season. Dates of treatment spanned vegetative through quiescent stages of phenology. Response variables included: summer regrowth, number of reproductive stems, fall growth, and subsequent spring herbage production, change in basal area, and root mass. Vigor of Thurber needlegrass was reduced most by defoliation during the early-boot stage of development. Impacts were successively less severe from vegetative, late-boot, and anthesis treatments, respectively. Cumulative herbage production the year of treatment was reduced from 38 to 64% by defoliation at the early-boot stage. The same treatment reduced subsequent spring growth by 46 to 51% and root mass the next spring by 34 to 45%. Treatment effects were somewhat reduced when temperature and moisture regimes allowed substantial regrowth after defoliation. Defoliation during or after anthesis had little effect on plant response. Managers should be aware that a single defoliation, particularly during the boot stage, can significantly reduce subsequent herbage production and root mass and possibly lower the competitive ability of Thurber needlegrass.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/3899519
    Scopus Count
    Collections
    Journal of Range Management, Volume 41, Number 6 (November 1988)

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