Index Catalog // ScholarsArchive@OSU

Directing ecological succession : the role of competition in restoring semi-arid grasslands dominated by invasive plants

Creator:: Mangla, Seema
Abstract:: Successful ecosystem restoration requires an understanding of the ecological processes directing succession. One of the challenges in the semi-arid grasslands of western United States is replacement of native species by invasive annual grasses. Solutions to this problem require identifying and manipulating ecological processes that direct succession to favor desired vegetation....
Resource Type:: Dissertation
Full Text:: dissertation. I want to extend thanks to my committee member Paul Doescher for introducing me to many

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 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

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:: all of his guidance and support as well as that of my committee members, Pat Muir, 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

Plant community recovery after high severity wildfire and post-fire management in the Klamath Region

Creator:: Lopez Ortiz, Maria Jose
Abstract:: Disturbance and microclimate interact to play a central role influencing the composition and structure of plant communities. In this thesis, I examined plant community composition and structure twenty years after high severity wildfires with and without post-fire management (salvage logging, fuel treatment, tree planting, and shrub release) under contrasting microclimatic...
Resource Type:: Masters Thesis
Full Text:: wouldn’t have done it without you! I am also indebted to my committee members Patricia Muir and Paul

Associations Between Crested Wheatgrass and Native Vegetation in Southeastern Oregon : An Investigation of Co-establishment, Environment, Seeding History, and Livestock management

Creator:: Nafus, Aleta M.
Abstract:: Crested wheatgrass (Agropyron cristatum [L] Gaertm), an introduced bunchgrass, has been seeded on over 5 million hectares of degraded rangeland in western North America because it establishes more readily than native bunchgrasses. Because crested wheatgrass stands are associated with native species displacement and low biological diversity, there is substantial interest...
Resource Type:: Dissertation
Full Text:: , Paul Doescher and John Lambrinos for their support and advice. I appreciate everything they

The effects of forest fuel reduction on fire severity and long-term carbon storage

Creator:: Mitchell, Stephen Richard
Abstract:: Two forest management objectives being debated in the context of federally managed landscapes in the US Pacific Northwest involve a perceived trade-off between fire restoration and C sequestration. The former strategy would reduce fuel (and therefore C) that has accumulated through a century of fire suppression and exclusion that has...
Resource Type:: Dissertation
Full Text:: ,especially Julia Jones, for their dedication to making the program a productive research effort that has

New perspectives on evolutionary relationships within Pinus (Pinaceae) and within subsection Ponderosae (subgenus Pinus)

Creator:: Willyard, Ann Nachreiner
Abstract:: A fossil-calibrated phylogenetic framework based on exemplars from each of the four taxonomic sections within Pinus was created using multiple nuclear and chloroplast loci. Calibration at the well-defined subgeneric split within Pinus with either fossil leaves and cones (ca. 45 million years ago) or fossil wood (ca. 85 million years...
Resource Type:: Dissertation
Full Text:: advisers Richard Cronn and Aaron Liston, and to my committee, Steven Strauss, Joseph Spatafora, and Paul

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:: , Sarah, too). In addition, I would like to thank my graduate committee members: Paul Doescher

ScholarsArchive@OSU

Directing ecological succession : the role of competition in restoring semi-arid grasslands dominated by invasive plants

Persistence of western juniper resource islands following canopy removal

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

Disturbance and dynamics of riparian forests in southwestern Oregon

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

Plant community recovery after high severity wildfire and post-fire management in the Klamath Region

Associations Between Crested Wheatgrass and Native Vegetation in Southeastern Oregon : An Investigation of Co-establishment, Environment, Seeding History, and Livestock management

The effects of forest fuel reduction on fire severity and long-term carbon storage

New perspectives on evolutionary relationships within Pinus (Pinaceae) and within subsection Ponderosae (subgenus Pinus)

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

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