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Filtering by: Creator Long Range Planning Conference (1969 : Curry County, Or.) Remove constraint Creator: Long Range Planning Conference (1969 : Curry County, Or.) Advisor Miller, Richard F. Remove constraint Advisor: Miller, Richard F. Non-Academic Affiliation Oregon State University. Graduate School Remove constraint Non-Academic Affiliation: Oregon State University. Graduate School

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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:
    % of the long-term mean (283 mm) in 1989 and 1990, respectively, which presented an opportunity to

  • 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:
    OR AN ABSTRACT OF THE THESIS OF Mark T. Freese for the degree of Master of

  • The influence of environmental attributes on temporal and structural dynamics of western juniper woodland development and associated fuel loading characteristics

    Creator:
    Johnson, Dustin D.
    Abstract:
    Since European American settlement of the Intermountain Region, dramatic changes in vegetation composition and structure have occurred in the sagebrush steppe ecosystem. Western juniper (Juniperus occidentalis spp. occidentalis Vasek), although indigenous to the Intermountain Region, has increased since the late 1800s. Considerable work has been done documenting juniper woodland expansion...
    Resource Type:
    Masters Thesis
    Full Text:
    . Soils are commonly shallow (25 to 38 cm) but range to deep (more than 122 cm). Fractured bedrock or

  • 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:
    , herbivory, and weather-related mortality, may have been equally or more important in shaping sage-grouse

  • Effect of site potential, season and plant part on the quality and yield of cereal aftermath

    Creator:
    Mee, Catherine
    Abstract:
    The objectives of this study were to evaluate the effects of site potential, season and plant part on percent crude protein, percent digestibility of dry matter and yield of cereal residues. Three cereal types, club wheat (Triticum aestivum) tall, bearded wheat (T. aestivum), and barley Hordeum vulgare) were examined. Stress...
    Resource Type:
    Masters Thesis
    Full Text:
    (Salisbury and Ross, 1969). The conditions which might exist under moisture or heat stress are (1) impaired

  • 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:
    ranges from Lassen County, California south along the east side of the Sierra Nevada Range to the San

  • 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:
    remove juniper fuels, such as broadcast burning downed trees or moving slash into piles with machinery

  • 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:
    Research Center-Burns, OR and the Oregon State University Rangeland Resources Department for funding my

  • 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:
    3 mm long scale-like leaves which occur in twos or, most often, threes. Vasek (1966) found

  • 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:
    of the economic land base where timber and forage resources are managed as dual or multiple uses of