SA@OSU Home
→
Electronic Theses and Dissertations
→
Electronic Theses and Dissertations
→
Browsing Electronic Theses and Dissertations by Author

Browsing Electronic Theses and Dissertations by Author "Radosevich, Steve"

Now showing items 1-20 of 20

Aboveground vegetation and viable seed bank of a dry mixed-conifer forest at a wildland-urban interface in Washington state

Snider, Gabrielle (2010-04-15)

Dry coniferous forests in the western United States are experiencing severe wildfires, insect outbreaks, forest disease epidemics and a growing presence of invasive species. Policies strongly emphasize reducing hazardous ...
Chemical suppression of a perennial ryegrass (Lolium perenne) living mulch and influence of ground cover management on growth of 'Chardonnay' wine grapes (Vitis vinifera) and Douglas fir Christmas trees (Pseudotsuga menziesii)

Brenner, Loretta K. (1991-03-01)
Directing ecological succession : the role of competition in restoring semi-arid grasslands dominated by invasive plants

Mangla, Seema (2010-09-21)

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 ...
Dynamics of size structures : simulation and experiments in seedling stands of Pseudotsuga menziesii and Fraxinus mandshurica

Petersen, Terry D. (1989-05-12)

Computer simulations and experiments were used to determine the basis for skewness and inequality in size structures (frequency distributions of Individual plant sizes) prior to self-thinning mortality. In simulated s ...
The ecological legacy of Indian burning practices in southwestern Oregon

Carloni, Kenneth R. (2005-05-20)

Two research questions are posed: (1) How have ecosystem conditions changed through time in southwestern Oregon? (2) How have culture-driven and climate-driven processes contributed to ecosystem change in southwestern ...
Ecosystem effects of vegetation removal in coastal Oregon Douglas-fir experimental plantations : impacts on ecosystem production, tree growth, nutrients, and soils

Yildiz, Oktay (2000-07-20)

Effects of partial understory removal on belowground and aboveground ecosystem properties were investigated in 5 and 15 yr old Douglas-fir (Pseudotsuga menziesll (Mirb.) Franco) experimental plantations in western Oregon ...
Factors affecting the regrowth of Himalya (sic) blackberry (Rubus armeniacus)

Jones, Daniel Karl (2004-09-29)

Himalaya blackberry (Rubus armeniacus) is a widespread, exotic, invasive plant now common over much of western Oregon and Washington. An observational experiment revealed that disturbance to a monoculture of Himalaya bla ...
Factors influencing growth of young Douglas-fir and red alder in the Oregon Coast Range : interference, nitrogen availability, and animal damage

Fuentes-Rodríquez, Laura Angélica (1993-12-02)

Red alder (Alnus rubra Bong.) is a common associate and a potentially severe competitor of Douglas-fir (Pseudotsuga menziesii var. menziesii [Mirb.] Franco) in the Oregon Coast Range. However, because it fixes nitrogen a ...
Managing growth and competition of a perennial ryegrass (Lolium perenne L.) living mulch in a vegetable cropping system

Wiles, Lori Jeannine (1986-07-03)

Vegetable production with a living mulch may reduce soil erosion and compaction, increase organic matter levels, and decrease the requirement for chemical inputs. Competition between the vegetable and mulch, however, has ...
The phytotoxic effects of herbicide and adjuvant application by physiological timing on the woody shrub salal (Gaultheria shallon)

Downs, Theodore Ellis (2008-07-11)

Salal is plant species that is native to forestland throughout the PNW and northern California that has been identified as a competitor to early crop tree development. This study consisted of a field and a radioisotope l ...
Population viability analysis of endangered plant species : an evaluation of stochastic methods and an application to a rare prairie plant

Kaye, Thomas N. (2001-05-18)

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, suc ...
Response of Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis) to defoliation of understory grasses and drought

Purrington, Teal Mackenzie (1992-01-29)

Water potential, leaf conductance, growth, nitrogen content, and seedling survival of Wyoming Big Sagebrush (Artemisia tridentata ssp. wyomingensis) following defoliation of the herbaceous understory were assessed du ...
The role and function of fruit trees and fruit tree-based agroforestry systems in a highland watershed in northern Thailand

Withrow-Robinson, Bradford A. (2000-08-25)

Field studies were conducted from 1996 to 1998 in three villages in a Highland watershed in Mae Hong Son Province, northern Thailand. The objectives of the study were to classify and define the fruit-based agroforestry c ...
Soil-site productivity relationships of central Oregon ponderosa pine

Wilson, Duncan Steil, 1969- (2003-02-04)

The relationship between annual foliage production and nitrogen and water stress was examined in 14 naturally regenerated, mid-rotation ponderosa pine stands in central Oregon. Current-year and older foliage masses, and ...
Structural development of late successional forests in the central Oregon Coast Range : abundance, dispersal, and growth of western hemlock (Tsuga heterophylla) regeneration

Schrader, Barbara A. (1998-02-13)

Patterns of western hemlock regeneration were studied in relation to forest structural development and environment in the Oregon Coast Range. Density of western hemlock seedlings was examined across the climatic gradien ...
The timber harvesting behavior of family forest owners

Butler, Brett J. (2005-05-05)

To increase our understanding of the timber harvesting behavior of family forest owners, I developed theoretical and empirical timber harvesting models for family forest owners in the southeastern United States. An indiv ...
Traditional ecological knowledge to develop and maintain fire regimes in northwestern California, Klamath-Siskiyou bioregion : management and restoration of culturally significant habitats

Lake, Frank K. (2007-07-30)

The use of Native American fire regimes evolved in the Klamath-Siskiyou bioregion over millennia. A mixture of Native American and Euro-American sociocultural management has developed from adaptations to climate, topog ...
Tree seedling establishment on heterogenous microsites in Douglas-fir forest canopy gaps

Gray, Andrew N. (1995-03-17)

Tree seedling establishment and growth were studied in experimental canopy gaps to determine the effect of structural and environmental heterogeneity on species dynamics within mature and old-growth Douglas-fir forests i ...
Water relations, survival and growth of Douglas-fir seedlings at a pinegrass dominated site in the interior Douglas-fir zone of south-central British Columbia

Nicholson, Alison Campbell (1989-04-14)

A field study was conducted to determine the impact of microclimate and vegetation on survival and growth of planted Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) at a pinegrass (Calamagrostis rubescens Bucki.) dom ...
Western juniper encroachment into aspen communities in the Northwest Great Basin

Wall, Travis G. (1999-06-30)

In the Northwest Great Basin, aspen (Populus tremuloides) communities uniquely contribute to the biodiversity of a semi-arid, sagebrush-dominated landscape. In this same region, western juniper (Juniperus occidentalis) ...