Search Constraints

Start Over
Filtering by: Subject Grazing -- Environmental aspects Remove constraint Subject: Grazing -- Environmental aspects Degree Level Doctoral Remove constraint Degree Level: Doctoral

Search Results

  • Watershed response to western juniper control

    Creator:
    Deboodt, Timothy L.
    Abstract:
    Western juniper (Juniperus occidentalis) encroachment has been associated with increased soil loss and reduced infiltration resulting in the loss of native herbaceous plant communities and the bird and animal species that rely on them. Hydrologically, however, change in water yield has been linked with the amount of annual precipitation a...
    Resource Type:
    Dissertation
    Full Text:
    ). Other financial support was provided by Crook County Taylor Grazing Board, Crook County Extension

  • Using a geographic information system (GIS) to monitor recreation impacts in a forested setting

    Creator:
    Wing, Michael
    Abstract:
    With a growing population and increasing demand for recreation resources, managers of public lands face unique challenges in allocating and overseeing resource use. One of the most reliable methods for gathering information from resource users involves surveying. Summaries and applications of survey results typically have not fully addressed the spatial...
    Resource Type:
    Dissertation

  • Use of Targeted and Non-Targeted Analysis to Study Complex PAH Environmental Mixtures

    Creator:
    Chibwe, Leah
    Abstract:
    Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous contaminants formed from the incomplete combustion of organic material. These contaminants are of concern because of their widespread presence in the environment and toxic properties. In addition, PAHs encompass a class of diverse compounds with varying physicochemical properties and exist in the environment as...
    Resource Type:
    Dissertation
    Full Text:
    Environmental Mixtures. Abstract approved

  • Uranium and technetium bio-immobilization in intermediate-scale physical models of an in situ bio-barrier

    Creator:
    Michalsen, Mandy M.
    Abstract:
    Metal and hydrogen ion acidity and extreme nitrate concentrations typical of Department of Energy (DOE) legacy waste sites pose formidable challenges to successful implementation of in situ bio-immobilization. Intermediate-scale (~ 2.5 m), flow through models of an in situ bio-barrier were constructed to investigate U and Tc removal from groundwater...
    Resource Type:
    Dissertation
    Full Text:
    __________________________________________________________________ Chair of the Department of Civil, Construction and Environmental Engineering

  • Unraveling tissue regeneration using chemical genetics

    Creator:
    Mathew, Lijoy K.
    Abstract:
    The emerging field of regenerative medicine is mainly approached by two different aspects. First is the use of stem cell based models to generate a suite of differentiated cells for therapeutic applications and the alternative approach is to utilize the non-mammalian models that have the inherent capacity to regenerate their...
    Resource Type:
    Dissertation
    Full Text:
    Department of Environmental and Molecular Toxicology Dean of the Graduate School

  • Uncertainty in forest road hydrologic modeling and catchment scale assessment offorest road sediment yield

    Creator:
    Surfleet, Christopher G.
    Abstract:
    The goal of this study was to advance methods for assessment of forest road hydrologic response and sediment yield at a catchment scale. This research looked at the effect of soil depth estimation on the Distributive Hydrology Soil Vegetation Model (DHSVM), assessed the uncertainty and accuracy of hydrologic modeling of...
    Resource Type:
    Dissertation
    Full Text:
    to salmonid conservation. Mantech Environmental Technology report TR-4501-96- 6047. Surfleet

  • Tsunami and hurricane wave loads on bridge superstructures

    Creator:
    Azadbakht, Mohsen
    Abstract:
    This dissertation examines tsunami and hurricane wave loads on bridge superstructures. Tsunamis have caused significant damage to coastal communities in recent years. For example, the 2011 Great East Japan Earthquake and resulting Tohoku Tsunami destroyed infrastructure along the east coast of Japan including bridge superstructures. Recent hurricanes have also caused...
    Resource Type:
    Dissertation

  • Trophic cascades and large mammals in the Yellowstone ecosystem

    Creator:
    Painter, Luke E.
    Abstract:
    Reintroduction of wolves to Yellowstone National Park (YNP) in 1995-96 provided a rare opportunity to observe the response of an ecosystem to the return of a top predator, including possible reversal of decades of decline of aspen, cottonwood, and tall willows suppressed by intensive herbivory on elk winter ranges. To...
    Resource Type:
    Dissertation
    Full Text:
    aspen stands. Hunting and livestock grazing were allowed in the Shoshone National Forest study area

  • Trans-Pacific and regional atmospheric transport of anthropogenic semivolatile organic compounds in the western U.S.

    Creator:
    Primbs, Toby
    Abstract:
    The atmospheric transport of anthropogenic semivolatile organic compounds (SOCs) from Asian sources to the Western U.S. was investigated. In addition, the SOC extraction method was optimized. Hansen solubility parameter plots were used to aid in the pressurized liquid extraction (PLE) solvent selection of air sampling media in order to minimize...
    Resource Type:
    Dissertation
    Full Text:
    atmospheric transport has been shown to be a major environmental transport pathway for the transport of SOCs

  • Trade-offs between management for fire risk reduction and northern spotted owl habitat protection in the dry conifer forests of southern Oregon

    Creator:
    Comfort, Emily Julia, 1974-
    Abstract:
    There is a perceived trade-off between fire risk reduction and northern spotted owl habitat protection in dry-conifer forests in southwestern Oregon. Management options for balancing this trade-off need to be sought at the landscape level. Applied landscape ecology suggests three important features to consider are (1) patch size and configuration...
    Resource Type:
    Dissertation
    Full Text:
    -settlement fire suppression, timber harvest, grazing, and land conversion has erased or obscured the