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Filtering by: Subject Seeds -- Cleaning -- Oregon Remove constraint Subject: Seeds -- Cleaning -- Oregon Advisor Borman, Michael M. Remove constraint Advisor: Borman, Michael M.

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  • Methods to assess factors that influence grass seed yield

    Creator:
    Louhaichi, Mounir
    Abstract:
    A greater than 10-fold increase in Canada goose (Branta canadensis) populations over the past several years has resulted in concerns over grazing impacts on grass seed production in the mid-Willamette Valley, Oregon. This study was designed to develop methods to quantify and statistically analyze goose-grazing impacts on seed yields of...
    Resource Type:
    Dissertation
    Full Text:
    in concerns over grazing impacts on grass seed production in the mid-Willamette Valley, Oregon. This

  • Role of propagule pressure and priority effects on plant establishment during restoration of invaded shrub-steppe

    Creator:
    Schantz, Merilynn C.
    Abstract:
    Biological plant invasions are diminishing the ecological integrity and function of ecosystems worldwide. A primary example of this is in the Great Basin of the United States, where invasive annual grasses, like cheatgrass (Bromus tectorum L.) and medusahead (Taeniatherum caput-medusae L. Nevski), are dominating many sagebrush-steppe ecosystems. In these invaded...
    Resource Type:
    Dissertation
    Full Text:
    ecosystems. Seed dispersal dynamics, including propagule pressure and priority effects, strongly influence