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    • Journal of Range Management, Volume 47 (1994)
    • Journal of Range Management, Volume 47, Number 6 (November 1994)
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    Effects of defoliation and competition on total non-structural carbohydrates of spotted knapweed

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    Author
    Lacey, J. R.
    Olson-Rutz, K. M.
    Haferkamp, M. R.
    Kennett, G. A.
    Issue Date
    1994-11-01
    Keywords
    Pseudoroegneria spicata
    carbohydrates
    Centaurea maculosa
    introduced species
    plant competition
    grazing
    
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    Citation
    Lacey, J. R., Olson-Rutz, K. M., Haferkamp, M. R., & Kennett, G. A. (1994). Effects of defoliation and competition on total nonstructural carbohydrates of spotted knapweed. Journal of Range Management, 47(6), 481-484.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644387
    DOI
    10.2307/4003001
    Additional Links
    https://rangelands.org/
    Abstract
    Spotted knapweed (Centaurea maculosa Lam.) is replacing native bunchgrasses and interfering with resource management objectives on many ranges in the northern Intermountain Region. Herbicides, biological control agents, and fire have not successfully contained spotted knapweed. Since knapweed is grazed in some situations, effects of defoliation and competition on total nonstructural carbohydrates (TNC) of spotted knapweed plants were determined in this study. Transplanted knapweed plants were grown for 6 months in a greenhouse under 3 levels of competition with bluebunch wheatgrass (Pseudoroegneria spicata [Pursh] Love) and 3 levels of defoliation. Total nonstructural carbohydrates (pool and concentration) were determined at the end of the experiment. Concentration and pools of carbohydrates generally varied among stems, roots, crowns, and with monthly defoliations. Importance of stems for carbohydrate storage was more evident in analyses of pools rather than concentrations. Monthly defoliations decreased carbohydrate concentrations by about 50%, and pools by about 80% respectively within stems, roots, and crowns. While competition from bluebunch wheatgrass influenced total nonstructural carbohydrates concentrations, it did not influence pools. Although frequent defoliations of spotted knapweed reduced carbohydrates, other factors probably limit the feasibility of using grazing animals to control spotted knapweed on native bunchgrass ranges in western North America.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003001
    Scopus Count
    Collections
    Journal of Range Management, Volume 47, Number 6 (November 1994)

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