Search Constraints

Start Over
Filtering by: Creator Hook, Richard Remove constraint Creator: Hook, Richard Advisor Miller, Richard F. Remove constraint Advisor: Miller, Richard F.

Search Results

  • 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:
    Pinus ponderosa Forests of Northeastern Oregon Abstract approved: Redacted for Privacy Richard F

  • 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:
    Associated Fuel Loading Characteristics Abstract approved: Richard F. Miller Since European American

  • Seed bank response to juniper expansion in the semi-arid lands of Oregon, USA

    Creator:
    Duncan, Corinne M.
    Abstract:
    Expansion of Juniperus occidentalis into the sagebrush steppe has resulted in significant changes in understory composition. A consequence of increased J. occidentalis dominance may be a depletion of the seed bank. The potential for depletion is problematic because a reduction in the amount of species available from the seed bank...
    Resource Type:
    Masters Thesis
    Full Text:
    : _____________________________________________________________________ Richard F. Miller Expansion of Juniperus occidentalis into the sagebrush steppe has

  • 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:
    Nitrogen Cycling Following ng of Wester -Juniper. Abstract approved : _ Richard F. Miller Abstract

  • 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:
    : Richard F. Miller Jon D. Bates On piñon

  • 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

  • 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:
    Bates and Dr. Richard Miller, for giving me a great deal of valuable advice, guidance, constructive

  • 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:
    approved: _____________________________________________________________________ Richard F. Miller