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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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    Observation: Comparative live-history of cheatgrass and yellow starthistle

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    Author
    Sheley, R. L.
    Larson, L. L.
    Issue Date
    1994-11-01
    Keywords
    seed production
    Centaurea solstitialis
    life cycle
    drought tolerance
    population dynamics
    rain
    Bromus tectorum
    Washington
    
    Metadata
    Show full item record
    Citation
    Sheley, R. L., & Larson, L. L. (1994). Observation: Comparative live-history of cheatgrass and yellow starthistle. Journal of Range Management, 47(6), 450-456.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644434
    DOI
    10.2307/4002995
    Additional Links
    https://rangelands.org/
    Abstract
    The objective of this research was to characterize the life-histories of cheatgrass (Bromus tectorum L.) and yellow starthistle (Centaurea solstitialis L.) growing in association. Biweekly demographic attributes were monitored during 1991 (moist spring) and 1992 (dry spring). Data were arranged into life-history tables, and sensitivity analysis was performed to determine key transition phases. The entire cheatgrass seed crop reached the soil surface, 41% of yellow starthistle's seed output was lost during seed rain. Frost heaving reduced winter seedling populations of cheatgrass (53%) more than yellow starthistle (40%). All cheatgrass seedlings surviving the frost heaving period became adults. Yellow starthistle density was reduced by 75% during the juvenile phase. Cheatgrass adults appeared about 6 weeks before yellow starthistle adults. Cheatgrass seed output remained about 7,000 m2 with moist and dry spring conditions. Yellow starthistle seed output was about 21,600 m2 and 5,200 m2 with moist and dry spring conditions, respectively. Reduction of yellow starthistle seed output with dry spring conditions suggest oscillatory community dynamics. Key processes associated with life-history transitions were interference (competition), resource acquisition rates and duration, and reproductive allocation.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002995
    Scopus Count
    Collections
    Journal of Range Management, Volume 47, Number 6 (November 1994)

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