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Filtering by: Creator Kelsey, Rick G. Remove constraint Creator: Kelsey, Rick G. Advisor Miller, Richard F. Remove constraint Advisor: Miller, Richard F.

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  • Western juniper encroachment into aspen communities in the Northwest Great Basin

    Creator:
    Wall, Travis G.
    Abstract:
    In the Northwest Great Basin, aspen (Populus tremuloides) communities uniquely contribute to the biodiversity of a semi-arid, sagebrush-dominated landscape. In this same region, western juniper (Juniperus occidentalis) is encroaching into aspen stands. This study determined the timing, extent, and some of the effects of this expansion. Aspen stands below 2,133...
    Resource Type:
    Masters Thesis
    Full Text:
    western juniper encroachment and replacement. ©Copyright by Travis G. Wall June 30, 1999 All Rights

  • 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:
    Dr. Rick Miller, and co-major professor Dr. Paul Doescher, for their guidance, friendship

  • Community analysis of the Wyoming big sagebrush alliance and functional role of Wyoming big sagebrush

    Creator:
    Davies, Kirk W.
    Abstract:
    This study consisted of two research projects in the Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis (Beetle & A. Young) S.L. Welsh) alliance, the most extensive of the big sagebrush complex in the Intermountain West. In the first project, we intensively sampled 107 relatively undisturbed, late seral Wyoming big sagebrush...
    Resource Type:
    Dissertation
    Full Text:
    sagebrush (spp. xericensis Winward ex R. Rosentreter & R. Kelsey), found on dry foothills in southern Idaho

  • Understory competition for resources in Pinus ponderosa forests of northeastern Oregon

    Creator:
    Riegel, Gregg M.
    Abstract:
    The objective of this research was to determine which environmental resources, light, water, and nutrients, control understory plant production and composition in a Pinus ponderosa forest in northeastern Oregon. A split-plot experimental design, with three blocks, four treatments, and 44 plots, was established in the summer of 1985. Twenty plots...
    Resource Type:
    Dissertation
    Full Text:
    Burns during the winter and spring of 1989. Dr. Rick Miller, my major professor, mentor, and now a

  • Vegetation and soil response to tree removal methods in invasive western juniper woodlands

    Creator:
    O'Connor, Casey A.
    Abstract:
    On piñon-juniper encroached sites that lack the understory fuels to carry a prescribed fire, treatment options are limited to mechanical methods. Cutting with chainsaws and leaving the trees on site has been the primary treatment method for such sites, however this method creates a potential fire hazard, particularly in the...
    Resource Type:
    Masters Thesis
    Full Text:
    to the countless drafts you‟ve had to look over. Rick and Jon, without your collaboration as co

  • 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:
    ecologist, Dr. Rick Miller. Working with and learning from him has been a pleasure. His generosity in

  • Understory vegetation response and nitrogen cycling following cutting of western juniper

    Creator:
    Bates, Jonathan D.
    Abstract:
    Since the late 1880's western juniper has expanded in range and increased in density in sagebrush-bunchgrass, riparian, and forested plant communities of the Pacific Northwest. Succession to western juniper woodland has been shown to reduce the productivity and diversity of the understory component, result in concentration of soil nutrients beneath...
    Resource Type:
    Dissertation
    Full Text:
    professors, Drs. Rick Miller and Tony Svejcar deserve a load of thanks and appreciation for their guidance

  • Linking greater sage-grouse habitat use and suitability across spatiotemporal scales in central Oregon

    Creator:
    Freese, Mark T.
    Abstract:
    Greater Sage-grouse (Centrocercus urophasianus) habitat research has historically focused on fine-scale (0.007 - 0.032 ha) vegetation structure and composition immediately surrounding sites selected by birds. However, little work has evaluated vegetation attributes important for Greater Sage-grouse at a landscape-scale or identified landscape attributes that influence habitat use patterns. Habitat use...
    Resource Type:
    Masters Thesis
    Full Text:
    have been unachievable without Dr.’s Rick F. Miller and Steven L. Petersen’s knowledge, guidance, and

  • 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:
    here to see this. CONTRIBUTION OF AUTHORS Dr. Rick Miller and Dr. Paul Doescher provided