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  • Response of Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis) to defoliation of understory grasses and drought

    Creator:
    Purrington, Teal Mackenzie
    Abstract:
    Water potential, leaf conductance, growth, nitrogen content, and seedling survival of Wyoming Big Sagebrush (Artemisia tridentata ssp. wyomingensis) following defoliation of the herbaceous understory were assessed during two growing seasons. Precipitation was 107% and 63% of the long-term mean (283 mm) in 1989 and 1990, respectively, which presented an opportunity...
    Resource Type:
    Masters Thesis
    Full Text:
    Richard F. Miller Paul S. Doescher Water potential, leaf conductance, growth, nitrogen content, and

  • Community structure of old-growth Juniperus occidentalis woodlands

    Creator:
    Waichler, Wendy Sims
    Abstract:
    Knowledge of old-growth Juniperus occidentalis woodlands, which occur in central and eastern Oregon, is limited. Wise management of these woodlands necessitates a better understanding of the community ecology. The community structure of woodlands at seven sites in three areas of central Oregon was studied. Measurements taken at nine plots per...
    Resource Type:
    Masters Thesis
    Full Text:
    occidentalis Woodlands. Richard F. Miller Paul S. Doescher Knowledge of old-growth Juniperus occidentalis

  • Modeling sage-grouse habitat using a state-and-transition model

    Creator:
    Evers, Louisa
    Abstract:
    Habitat for wildlife species that depend on sagebrush ecosystems is of great management concern. Evaluating how management activities and climate change may affect the abundance of moderate and high-quality habitat necessitates the development of models that examine vegetation dynamics, but modeling tools for rangeland systems are limited. I developed state-and-transition...
    Resource Type:
    Dissertation
    Full Text:
    Abstract approved: Richard F. Miller Paul S. Doescher Habitat for wildlife species that

  • Relationship between allometric variables and biomass in western juniper (Juniperus occidentalis)

    Creator:
    Sabin, Breanna S.
    Abstract:
    A tenfold expansion of western juniper (Juniperus occidentalis spp. occidentalis) into the sagebrush steppe has led to the degradation of the economic and ecological potential of these landscapes. Land managers have enacted numerous methods to reduce distributions and densities of these trees. Assessment of above ground juniper biomass, expressed overall...
    Resource Type:
    Masters Thesis
    Full Text:
    : _______________________________________________________________ Richard F. Miller Paul S. Doescher