Index Catalog // ScholarsArchive@OSU

Silvicultural impacts of sheep grazing in Oregon's Coast Range

Creator:: Leininger, Wayne C.
Abstract:: A three-year investigation was conducted during 1980-1982 to evaluate the potential of using herded sheep as a silvicultural tool to suppress brush in Douglas-fir (Pseudotsuga menziesii) plantations of Oregon's Coast Range. Sheep browsing of Douglas-fir was highest in May soon after bud break. Averaged over the 2 years of grazing,...
Resource Type:: Dissertation
Full Text:: Table of Contents (continued) Management Implications 113 Literature Cited 115 CHAPTER V: THE

Effect of western juniper on understory herbage production in Central Oregon

Creator:: Vaitkus, Milda R.
Abstract:: Evidence suggests that western juniper (Juniperus occidentalis) in Central Oregon affects understory production and composition. As trees increase in size and density, understory production is reduced and composition changes. This study was designed to identify the relationship between production and composition of understory vegetation and various tree canopy sizes of...
Resource Type:: Masters Thesis
Full Text:: temperatures may reach a maximum of 5 46° C (115°F) and winter temperatures of -47°C (-53°F) have been

Understory competition for resources in Pinus ponderosa forests of northeastern Oregon

Creator:: Riegel, Gregg M.
Abstract:: The objective of this research was to determine which environmental resources, light, water, and nutrients, control understory plant production and composition in a Pinus ponderosa forest in northeastern Oregon. A split-plot experimental design, with three blocks, four treatments, and 44 plots, was established in the summer of 1985. Twenty plots...
Resource Type:: Dissertation
Full Text:: light measurements. Larry Bryant (USFS PNW, La Grande) graciously loaned a water pump enabling us to

Influence of cow age/experience and landscape thermal regimes on distribution and grazing patterns of cattle in northeastern Oregon mixed conifer forested rangelands

Creator:: Wells, Micah
Abstract:: Two studies were conducted to determine the factors influencing distribution of cattle on northeastern Oregon mixed-conifer forested rangelands. The objective of the first study was the quantification of differences in distribution of cattle of different ages. Beginning in 1991, and continuing through 2001, radio telemetry collars were placed on a...
Resource Type:: Masters Thesis
Full Text:: energetics of small birds. Journal of Thermal Biology 2, 115-120. Mendel, V. E. Morrison S. R. Bond T. E

Seasonal response of bitterbrush to burning and clipping in eastern Oregon

Creator:: Clark, Robert G.
Abstract:: Bitterbrush [Purshia tridentata (Pursh) DC] plants were burned or clipped, fall and spring, under different soil moisture conditions on two sites in east-central Oregon. Treatments, on plants of an erect growth form on the Juniperus/Artemisia-Purshia site resulted in 38% of the fall-clipped and 40% of the spring-clipped plants sprouting. None...
Resource Type:: Masters Thesis

Ecology of the Salix and Populus species of the Crooked River National Grassland

Creator:: Busse, Kathryn Grace
Abstract:: Riparian communities dominated by members of the Salicaceae (Salix lasiandra, S. lutea, S. lemmonii, Populus trichocarpa, P. tremuloides and S. exiqua) were studied at the Crooked River National Grassland in central Oregon. The objectives of this study were to examine the relationships between the Salix and Populus species and microsite...
Resource Type:: Masters Thesis

Western juniper encroachment into aspen communities in the Northwest Great Basin

Creator:: Wall, Travis G.
Abstract:: 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) is encroaching into aspen stands. This study determined the timing, extent, and some of the effects of this expansion. Aspen stands below 2,133...
Resource Type:: Masters Thesis

The influence of environmental attributes on temporal and structural dynamics of western juniper woodland development and associated fuel loading characteristics

Creator:: Johnson, Dustin D.
Abstract:: Since European American settlement of the Intermountain Region, dramatic changes in vegetation composition and structure have occurred in the sagebrush steppe ecosystem. Western juniper (Juniperus occidentalis spp. occidentalis Vasek), although indigenous to the Intermountain Region, has increased since the late 1800s. Considerable work has been done documenting juniper woodland expansion...
Resource Type:: Masters Thesis

Soil and understory vegetation characteristics of a tractor-logged forest in eastern Oregon

Creator:: Snider, Michael Duane
Abstract:: A 1.5 ha mixed conifer stand in the Blue Mountains of Oregon was intensively examined to assess the impact of logging disturbance on soils and herbaceous vegetation. Sampling was conducted six years after much of the timber overstory was removed in a shelterwood cut and yarded by crawler tractor. A...
Resource Type:: Masters Thesis

Community structure of old-growth Juniperus occidentalis woodlands

Creator:: Waichler, Wendy Sims
Abstract:: Knowledge of old-growth Juniperus occidentalis woodlands, which occur in central and eastern Oregon, is limited. Wise management of these woodlands necessitates a better understanding of the community ecology. The community structure of woodlands at seven sites in three areas of central Oregon was studied. Measurements taken at nine plots per...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Silvicultural impacts of sheep grazing in Oregon's Coast Range

Effect of western juniper on understory herbage production in Central Oregon

Understory competition for resources in Pinus ponderosa forests of northeastern Oregon

Influence of cow age/experience and landscape thermal regimes on distribution and grazing patterns of cattle in northeastern Oregon mixed conifer forested rangelands

Seasonal response of bitterbrush to burning and clipping in eastern Oregon

Ecology of the Salix and Populus species of the Crooked River National Grassland

Western juniper encroachment into aspen communities in the Northwest Great Basin

The influence of environmental attributes on temporal and structural dynamics of western juniper woodland development and associated fuel loading characteristics

Soil and understory vegetation characteristics of a tractor-logged forest in eastern Oregon

Community structure of old-growth Juniperus occidentalis woodlands

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