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Filtering by: Advisor Barber, David A. Remove constraint Advisor: Barber, David A. Academic Affiliation Botany and Plant Pathology Remove constraint Academic Affiliation: Botany and Plant Pathology

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  • Biological Soil Crusts of the Great Basin : An Examination of their Distribution, Recovery from Disturbance and Restoration

    Creator:
    Condon, Lea A.
    Abstract:
    We are at risk of losing the sagebrush steppe in the floristic Great Basin to the invasion of Bromus tectorum L., cheatgrass. The floristic Great Basin includes the Central Basin and Range, the Northern Basin and Range, and the Snake River Plain. The Great Basin receives most of its precipitation...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________ David A. Pyke Bruce McCune We are at risk of losing the sagebrush steppe in the

  • Seed and seedling ecology of Artemisia tridentata in a restoration context

    Creator:
    Wijayratne, Upekala C.
    Abstract:
    The semi-arid sagebrush steppe ecosystem is one of the largest biomes in North America. The steppe provides critical habitat and forage for wildlife and is economically important to recreation and livestock industries. However, the ecosystem is threatened primarily due to several negative effects associated with expansion of the exotic annual...
    Resource Type:
    Dissertation
    Full Text:
    : _____________________________________________________________________ David A. Pyke Patricia S. Muir The semi-arid sagebrush steppe ecosystem is one of

  • Yield responses of invasive grasses to carbon doses

    Creator:
    Brunson, Jessi L.
    Abstract:
    The sagebrush steppe ecosystem of the northern Great Basin is severely degraded and continues to decline due in large part to the invasive, non-native annual grasses Bromus tectorum L. (cheatgrass) and Taeniatherum caput-medusae (L.) Nevski (medusahead). Restoration of invasive-dominated areas is difficult, but can be enhanced by adding a carbon...
    Resource Type:
    Masters Thesis
    Full Text:
    : David A. Pyke Patricia S. Muir The sagebrush steppe ecosystem of the northern Great Basin is

  • Tackifier Type and Concentration have Varying Impacts on Growth of Dryland Mosses

    Creator:
    Blankenship, Wyatt D.
    Abstract:
    There is growing interest in using biocrusts (assemblages of cyanobacteria, lichens, mosses, and other taxa in various proportions covering the upper few millimeters of the soil surface) to assist in restoring ecosystem function and native plant communities in dryland ecosystems. Biocrusts can be transplanted and established using jute or thatch,...
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract approved: ______________________________________________________ David A. Pyke Bruce

  • Litter decay processes and soil nitrogen availability in native and cheatgrass-dominated arid rangelands

    Creator:
    Harrison, Kristen S.
    Abstract:
    As large-scale restorations of degraded rangelands are initiated, land managers need to understand how decades of dominance by the invasive annual grass, cheatgrass (Bromus tectorum L.), have altered ecosystem processes. One way to assess such alterations is by observing differences in decay rates, since decomposition is determined by factors such...
    Resource Type:
    Masters Thesis
    Full Text:
    approved David A. Pyke Kate Lajtha As large-scale restorations of degraded rangelands are initiated, land

  • Studies on the etiology and epidemiology of bull's eye rot of pears

    Creator:
    Henriquez, Jose Luis, 1961-
    Abstract:
    The objective of this dissertation is to introduce low-cost processing methods for the fabrication of ZnO transparent thin-film transistors (TTFTs). A novel method for depositing ZnO body layers via spin-coating of a zinc nitrate-based spin solution is presented. The processing conditions of spin-coated ZnO are optimized to produce continuous and...
    Resource Type:
    Dissertation
    Full Text:
    Neofabraea a/ba and N perennans; (3) to monitor conidial production in cankers; (4) to determine the timing

  • Establishment tolerance of six native sagebrush steppe species to imazapic (PLATEAU®) herbicide implications for restoration and recovery

    Creator:
    Bekedam, Steven
    Abstract:
    Scientists and land managers realize that integrated weed management (IWM) strategies are needed to attain successful and lasting improvements of weed infested landscapes. At this time no broadly reliable and environmentally safe IWM strategy has been developed to control exotic annual grasses that dominate many ecosystems of the northern Great...
    Resource Type:
    Masters Thesis
    Full Text:
    evaporation of available moisture early in the growing season. Emergence was 3.2 and 2.2 times sooner for A

  • The effects of defoliation on Bromus tectorum seed production and growth

    Creator:
    Mayer, Kara Hempy
    Abstract:
    Cheatgrass (Bromus tectorum L.) is a widespread exotic weed in the Intermountain sagebrush steppe. An annual grass, it is highly prolific and very competitive with native perennial grass seedlings. A clipping experiment carried out at two cheatgrass-dominated sites (Lincoln Bench and Succor Creek) in eastern Oregon analyzed effects of defoliation...
    Resource Type:
    Masters Thesis
    Full Text:
    approved: 7 i/ David A, Pyke and Mark V. Wilson Cheatgrass (Bromus tectorum L.) is a widespread exotic

  • Hydromulch tackifier and sucrose effects on microbial nitrogen and Bromus tectorum biomass

    Creator:
    Perkins, Lora B.
    Abstract:
    There is growing interest in using nutrient manipulations to control invasive plants such as Brornus lectorurn L. (cheatgrass). Both labile (sucrose) and recalcitrant (straw and sawdust) carbon sources are added to the soil surface to reduce plant available soil N via soil microbial immobilization. However, the application rates used in...
    Resource Type:
    Masters Thesis
    Full Text:
    Tackifier and Sucrose Effects on Microbial Nitrogen and Bromus tectorum Biomass Abstract approved: David A

  • Population viability analysis of endangered plant species : an evaluation of stochastic methods and an application to a rare prairie plant

    Creator:
    Kaye, Thomas N.
    Abstract:
    Transition matrix models are one of the most widely used tools for assessing population viability. The technique allows inclusion of environmental variability, thereby permitting estimation of probabilistic events, such as extinction. However, few studies use the technique to compare the effects of management treatments on population viability, and fewer still...
    Resource Type:
    Dissertation
    Full Text:
    Rare Prairie Plant. Abstract Abstract approved: David A Patricia S. Muir Transition matrix models