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    • Journal of Range Management, Volume 53 (2000)
    • Journal of Range Management, Volume 53, Number 3 (May 2000)
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    Western ragweed effects on herbaceous standing crop in Great Plains grasslands

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    Author
    Vermeire, L. T.
    Gillen, R. L.
    Issue Date
    2000-05-01
    Keywords
    height-weight ratio
    tallgrass prairie
    mixed prairie
    mixed pastures
    Ambrosia psilostachya
    growth curve
    rain
    Oklahoma
    plant communities
    plant density
    prairies
    biomass
    botanical composition
    plant competition
    grazing
    grasses
    Ambrosia psilostachya
    plant competition
    grazing effects
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    Citation
    Vermeire, L. T., & Gillen, R. L. (2000). Western ragweed effects on herbaceous standing crop in Great Plains grasslands. Journal of Range Management, 53(3), 335-341.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/643771
    DOI
    10.2307/4003442
    10.2458/azu_jrm_v53i3_vermeire
    Additional Links
    https://rangelands.org/
    Abstract
    Western ragweed [Ambrosia psilostachya DC. ], a major forb species in mixed and tallgrass prairies, is considered to have little value for cattle grazing but is an important food item for bobwhite quail [Colinus virginianus]. While often thought to be a strong increaser with grazing pressure, information on the actual relationship between western ragweed and grasses is contradictory. Our objectives were to 1) determine the effect of western ragweed on grass standing crop, and 2) determine the effect of vegetation type and grazing on survival and shoot morphology of western ragweed. Western ragweed did not appear to reduce grass standing crop. Instead, standing crop (40 to 620 kg ha-1) and density (6 to 41 shoots m-2) of western ragweed were positively related to grass and grass-forb standing crop in mixed prairie. Standing crop of western ragweed was not related to grass standing crop in tallgrass prairie. Competitive thresholds for western ragweed in mixed and tallgrass prairies appear to be above the levels observed in this study. Density of western ragweed shoots decreased over the growing season under both grazed and ungrazed treatments. Survival of western ragweed shoots from June to September was greater in mixed prairie (81%) than in tallgrass prairie (63%) and was greater in ungrazed (76%) than grazed plots (68%). Western ragweed shoots weighed less per unit of height in tall grassprairie. Western ragweed shoots in ungrazed plots were taller than shoots in grazed plots but weighed less per unit of height. These differences in shoot morphology are consistent with increased competition for light in tallgrass prairie and in ungrazed sites. Western ragweed may not directly reduce grass standing crop but, rather, increase only when grasses are reduced by other stresses such as improper grazing.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003442
    Scopus Count
    Collections
    Journal of Range Management, Volume 53, Number 3 (May 2000)

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