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  • Models of a four-species annual weed community : growth, competition, and community dynamics

    Creator:
    Roush, Mary Lynn
    Abstract:
    Models of weed communities aid in the development of weed management strategies and elucidate the processes and mechanisms that regulate plant populations and communities. A conceptual weed community model was developed to organize key regulatory life-history processes. Specific investigations focused on the processes of plant growth and competition, and relationships...
    Resource Type:
    Dissertation
    Full Text:
    : Growth, Competition, and Community Dynamics. by Mary Lynn Roush A THESIS submitted to Oregon State

  • Quaking aspen persistence in three Oregon landscapes

    Creator:
    Seager, S. Trent
    Abstract:
    Quaking aspen (Populus tremuloides) is an important tree species in the western United States and there has been much concern about its persistence. In this thesis, I report on aspen in a portion of its range that has not been previously evaluated: the eastern and western slopes of the Central...
    Resource Type:
    Masters Thesis
    Full Text:
    Forest and Range Experiment Station, 135-152. Debyle, N.V., Winokur, R.P., 1985. Aspen: Ecology and

  • Role of propagule pressure and priority effects on plant establishment during restoration of invaded shrub-steppe

    Creator:
    Schantz, Merilynn C.
    Abstract:
    Biological plant invasions are diminishing the ecological integrity and function of ecosystems worldwide. A primary example of this is in the Great Basin of the United States, where invasive annual grasses, like cheatgrass (Bromus tectorum L.) and medusahead (Taeniatherum caput-medusae L. Nevski), are dominating many sagebrush-steppe ecosystems. In these invaded...
    Resource Type:
    Dissertation
    Full Text:
    State University in Corvallis, OR. In addition, I would like to thank the Eastern Oregon Agricultural

  • The Biology and ecology of weeping alkaligrass (Puccinellia distans) and Nuttall’s alkaligrass (Puccinellia nuttalliana)

    Creator:
    Tarasoff, Catherine
    Abstract:
    Weeping alkaligrass (Puccinellia distans) and Nuttall’s alkaligrass (Puccinellia nuttalliana) infest Kentucky bluegrass seed fields of eastern Oregon. Weeping alkaligrass is an introduced species from Eurasia, whereas Nuttall’s alkaligrass is native to semi arid environments of western North America. These species are often referred to collectively as ‘alkaligrass’; however, for farmers...
    Resource Type:
    Dissertation
    Full Text:
    Basin Agricultural Research Center, Oregon State University, Pendleton, OR 97801

  • 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:
    competitive with native perennial grass seedlings. A clipping experiment carried out at two cheatgrass

  • Spatial and age class analysis of managed western juniper (Juniperus occidentalis) woodlands in central Oregon

    Creator:
    Zophy, Kelley T.
    Abstract:
    Juniper is a native species to Oregon and confers ecological benefits to wildlife when it is at savannah and transitional densities. Its range and extent have fluctuated with climatic change, but the current range expansion is unprecedented in its extent. The range expansion has been associated with the degradation of...
    Resource Type:
    Masters Thesis
    Full Text:
    changes in precipitation, but the species did not reach northeastern California and southern Oregon

  • Restructuring of land and community in the remote rural west : the case of Wallowa County, Oregon

    Creator:
    Abrams, Jesse
    Abstract:
    Since at least the 1970s, rural areas in the western United States, as elsewhere across the country and world, have been subject to social, economic, and political forces that have resulted in novel demographic and land tenure trends when compared to previous decades. Collectively, these processes of restructuring have created...
    Resource Type:
    Dissertation
    Full Text:
    the Remote Rural West: The Case of Wallowa County, Oregon Abstract approved

  • An evaluation of biological control of Linaria dalmatica with Mecinus janthinus in Oregon

    Creator:
    Park, Alexander
    Abstract:
    Dalmatian toadflax (Linaria dalmatica) has become a prolific invasive plant of rangelands in Oregon since its arrival in the early 20th century. In 2001, the Oregon Department of Agriculture initiated a release program promoting the distribution of the stem-boring weevil, Mecinus janthinus as classical biological control agent to reduce densities...
    Resource Type:
    Masters Thesis
    Full Text:
    Mecinus janthinus in Oregon AN ABSTRACT OF THE THESIS OF Alexander Park for the degree of Master of

  • Disturbance and dynamics of riparian forests in southwestern Oregon

    Creator:
    Messier, Michael S.
    Abstract:
    Fire exclusion has been associated with structural and compositional changes in many upland forests of the western United States, but little is known about the impacts on riparian forests, portions of the landscape protected for habitat and water quality. For this study, I characterized the historic disturbance and tree recruitment...
    Resource Type:
    Masters Thesis
    Full Text:
    Conifer (MC) vegetation zone is typical of mid-elevation forests in the southern Oregon Cascade Range

  • Persistence of western juniper resource islands following canopy removal

    Creator:
    Miwa, Christopher
    Abstract:
    Western juniper (Juniperus occidentalis) cover has more than doubled within the last century and currently occupies over 9 million acres in the Intermountain West. Encroachment has altered the spatial distribution of soil nutrients and plants in these systems, forming nutrient enriched 'resource islands,' under tree canopies. The purpose of this...
    Resource Type:
    Masters Thesis
    Full Text:
    Eastern Oregon Agricultural Research Center, your funding was instrumental in helping to finish my lab