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Filtering by: Creator Valle, Paul S. Remove constraint Creator: Valle, Paul S. Committee Member Doescher, Paul Remove constraint Committee Member: Doescher, Paul Rights Statement In Copyright Remove constraint Rights Statement: In Copyright

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  • 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:
    AN ABSTRACT OF THE THESIS OF S Trent Seager for

  • 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:
    THESIS OF Michael S. Messier for the degree of Master of Science in Forest Science presented on

  • 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:
    cascades it never felt that way. - My committee, John Baham and Paul Doescher, your guidance in

  • Spatial patterns of fuel management activities and their effects on wildfire behavior

    Creator:
    Kim, Young-Hwan
    Abstract:
    Fuel management has been used as an effective local strategy to reduce the undesirable consequences of wildfires. Many efforts toward scheduling of fuel management activities across a broader landscape have been proposed, with the hope of achieving larger landscape-scale management effects. However, scheduling of fuel management treatments across the broader...
    Resource Type:
    Dissertation
    Full Text:
    , Committee members, Dr. Jack Walstad, Dr. Paul Doescher, Dr. Lisa Madsen, and Dr. Starr McMullen, The

  • Competition release and climate change effects on a moisture-demanding tree species in a dry system

    Creator:
    Seager, S. Trent
    Abstract:
    Climate change and the increase in meteorological drought have generated global concern over the persistence of ecosystems already in decline from decreased moisture. Evidence suggests dryland ecosystems have been more impacted by drought because of their tightly coupled growth-water relationships and high sensitivity to environmental shift. Removal of competing vegetation...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE DISSERTATION OF S Trent Seager for the degree of Doctor of Philosophy in

  • Vegetation composition and response to fire of native Willamette Valley wetland prairies

    Creator:
    Pendergrass, Kathy L. (Connelly)
    Abstract:
    Fires set by Native Americans were important in shaping and maintaining Willamette Valley prairie plant communities. With fire exclusion after Euro-American settlement in the 1840's, composition of the remaining prairies shifted toward shrub and tree dominance with a concomitant decline in endemic prairie plant populations. I hypothesize that by restoring...
    Resource Type:
    Masters Thesis
    Full Text:
    communities. With fire exclusion after Euro- American settlement in the 1840's, composition of the remaining

  • 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:
    mentor and to Dr. Paul Doescher, and Dr. Richard Miller, who have provided thoughtful insights and

  • Effects of wildfire burn severity on soil microbial communitiesand invasive plant species in the Cascade Range of Oregon

    Creator:
    Hebel, Cassie L.
    Abstract:
    Fire suppression in the last several decades has resulted in unprecedented accumulations of organic matter on the landscape, leading to an increase in large, intense wildfires. This study investigated the soil microbial community (using phospholipid fatty acid analysis) across recently burned forests on the eastern slope of the Cascade Range...
    Resource Type:
    Masters Thesis
    Full Text:
    throughout my program. In addition I would like to thank my other committee members Dr. Paul Doescher and

  • A characterization of seasonal pools in Central Oregon's high desert

    Creator:
    Dlugolecki, Laura
    Abstract:
    Seasonal wetlands in arid and semi-arid lands provide an important source of surface water in otherwise dry lands. Central Oregon's high desert, located in the Northern Great Basin (NGB) is dotted with hundreds of seasonal pools, locally called playas. The playas hold water or snow during parts of winter and...
    Resource Type:
    Masters Thesis
    Full Text:
    member Paul Doescher for introducing me to many fascinating concepts about ecological restoration and

  • Climate-growth relationships of western juniper and ponderosa pine at the pine-woodland ecotone in southern Oregon

    Creator:
    Knutson, Kevin C.
    Abstract:
    Pinyon-juniper woodlands throughout the western U.S. have expanded rapidly following European settlement during the late 19th century. In central and eastern Oregon, western juniper (Juniperus occidentalis var. occidentalis Hook.) encroachment has been previously documented in the sagebrush steppe and upper elevation aspen communities. While these vegetation changes and dynamics have...
    Resource Type:
    Masters Thesis
    Full Text:
    Dr. Rick Miller, Dr. Paul Doescher, and Dr. Barb Gartner, who, in serving on my committee, have all