Index Catalog // ScholarsArchive@OSU

Growth responses of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) to defoliation

Creator:: Osman, Khalid Amir
Abstract:: The effect of defoliation intensity and season on Douglas-fir growth were studied in three replications in the Siuslaw National Forest during 1988-1990. Four intensities of defoliation were applied once in either spring or summer 1988. Stem diameter and canopy area were linearly inversely proportional to the level of defoliation. Defoliation...
Resource Type:: Dissertation
Full Text:: Doescher for his suggestions and support, Dr. Kermit Cromack for his advice and assistance, Dr. Gary Jo

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:: :_ Steven R. Radosevich Models of weed communities aid in the development of weed management strategies

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. Initial preburn R. nutkana densities ranged from 30,519 to 50,963 plants ha -1 at Rose Prairie

Modeling slope stability uncertainty : a case study at the Andrews Experimental Forest

Creator:: Murillo, Michelle L.
Abstract:: A simple debris-slide model, employing a digital elevation model (DEM) and geological data, was used in a geographic information system (GIS) to map slope stability in the Andrews Experimental Forest, located in the western Cascade Range in Oregon, USA. To evaluate the contribution of error in elevation to the uncertainty...
Resource Type:: Masters Thesis
Full Text:: other committee members; Drs. Jon Kimerling and Paul Doescher. A very special thanks to Dr. Gary

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:: , facilitating the further spread of cheatgrass (Young and Evans 1978; West 1983; Billings 1990; Whisenant 1990

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:: availability, because seedlings quickly respond to changes in matric potential (Evans & Etherington, 1991

Intercropping trees in a vegetable production systems : a holistic inquiry

Creator:: Seiter, Stefan
Resource Type:: Dissertation
Full Text:: cropping species. R pseudoacacia's ability to produce green manure after frequent coppicing appeared to

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:: Miller, and Dan Sharratt – this wouldn’t have happened without your work. A sincere thank you to Gary

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:: invasion following disturbance (Dormaar and Smoliak 1985; Young and Evans 1986; Heady 1988; D'Antonio and

Demography of medusahead on two soil types : potential for invasion into intact native communities

Creator:: Miller, Heather C.
Resource Type:: Masters Thesis
Full Text:: study, Young and Evans (1970) observed that wet meadows and burned coniferous forests at high

ScholarsArchive@OSU

Growth responses of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) to defoliation

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

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

Modeling slope stability uncertainty : a case study at the Andrews Experimental Forest

The effects of defoliation on Bromus tectorum seed production and growth

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

Intercropping trees in a vegetable production systems : a holistic inquiry

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

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

Demography of medusahead on two soil types : potential for invasion into intact native communities

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