Index Catalog // ScholarsArchive@OSU

Cardaria draba (L.) Desv. in the sagebrush ecosystem of northeastern Oregon

Creator:: Smergut, Teresa A.
Abstract:: Ranchers and resource managers have become concerned about the role and spread of Cardaria draba (L.) Desv. (whitetop) in the sagebrush steppe of Northeastern Oregon. This area is an important natural resource for livestock production and big game winter range. An area near Keating, Oregon was selected to study the...
Resource Type:: Masters Thesis
Full Text:: density changes between 1987 and 1989. 22 4. Analysis of permanent transect and root excavation data from

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
Full Text:: occidentalis) 20 Distribution 20 Climate 21 Soils 21 Reproduction 22 Stand dynamics 22 Disturbance 23

Similarities in understory vegetation composition between unthinned, thinned and old-growth Douglas fir stands in western Oregon

Creator:: Mayrsohn, Cheryl
Abstract:: Forest stands were studied to determine if old-growth forest structure could be mimicked in younger stands via overstory manipulation. Cover and species composition of understory plants were systematically sampled in sixteen thinned second-growth stands and sixteen adjacent unthinned second-growth Douglas fir (Pseudotsuga menziesii (Mirabel) Franco.) stands. The stands were thinned...
Resource Type:: Masters Thesis
Full Text:: collected at each site, weather data from nearby U.S. 22 Weather service remote weather stations was

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
Full Text:: the A. tridentata ssp. vaseyana sites was 22%. In stands dominated by mature trees, densities of 138

"The Island" Research Natural Area : a vegetation study with time and location comparisons

Creator:: Fox, M. Anne, 1939-
Abstract:: The purpose of this study was to document vegetation on "The Island", a Research Natural Area at the confluence of the Crooked River and the Deschutes River in central Oregon's Juniperus occidentalis Zone and to compare the results with an earlier study reported in 1964 from 1960-'61 data. Present-day comparisons...
Resource Type:: Masters Thesis
Full Text:: sites. 22 lb. Another set of the three macroplots sampling P. tridentata elsewhere on "The

Quality of bluebunch wheatgrass (Agropyron spicatum) as a winter range forage for Rocky Mountain Elk (Cervus elaphus nelsoni) in the Blue Mountains of Oregon

Creator:: Bryant, Larry Duane
Abstract:: This research was conducted on three study areas on elk winter ranges in Northeast Oregon. One was on the Starkey Experimental Forest and Range and the others were in the same vicinity. Plant appendages, spring and fall defoliation and fall growth of bluebunch wheatgrass were evaluated in terms of quality...
Resource Type:: Dissertation
Full Text:: Wheatgrass 20 Nutritional Value 22 Grazing Tolerances 23 THE STUDY AREAS 29 Climate 29 Vegetation and

Re-establishment of native perennial bunchgrasses in juniper/medusahead rangelands

Creator:: Washington, Joseph P.
Resource Type:: Masters Thesis
Full Text:: Study Area 10 Climate Regime 13 Experimental Treatments 16 Data Collection 20 Data Analysis 22

Fire effects on vegetation diversity, structure, and successional dynamics in shrub-steppe and mixed conifer environments of the Hells Canyon, Idaho

Creator:: Havlina, Douglas William
Abstract:: The effects of fire severity on post-fire succession and shrub demography were quantified in shrub-steppe grasslands and subalpine forests in the Hells Canyon of the Payette National Forest, Idaho. Following the 1988 Eagle Bar Fire, species frequency, community diversity, fire adaptations, and stand ages were quantified at 12 plots in...
Resource Type:: Masters Thesis
Full Text:: 1232 24 (8) 98 (26) 1967 NA 50 NA Mean: (8.23) (672) (22) Tussel Ridge PSR West: Psme Abla 40.78 1392

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:: Defoliation 22 Abstract 23 Introduction 25 Study Areas 27 Materials and Methods 28 Defoliation Treatments

Use of livestock to improve the quality of elk winter range forage in northeastern Oregon

Creator:: Clark, Patrick Eugene
Abstract:: The effects of late spring defoliation on the winter forage quality of bluebunch wheatgrass (Agropyron spicatum [Pursh] Scribn. & Smith), Idaho fescue (Festuca idahoensis Elmer) and elk sedge (Carex geyeri Boott) and the response of wintering Rocky Mountain elk (Cervus elaphus nelsoni Bailey) to changes in winter range forage quality...
Resource Type:: Dissertation
Full Text:: 2.2.8 Livestock and Elk: Habitat Overlap 21 2.3 Livestock and Elk: Diets 22 2.3.1 Evaluation

ScholarsArchive@OSU

Cardaria draba (L.) Desv. in the sagebrush ecosystem of northeastern Oregon

Western juniper encroachment into aspen communities in the Northwest Great Basin

Similarities in understory vegetation composition between unthinned, thinned and old-growth Douglas fir stands in western Oregon

Community structure of old-growth Juniperus occidentalis woodlands

"The Island" Research Natural Area : a vegetation study with time and location comparisons

Quality of bluebunch wheatgrass (Agropyron spicatum) as a winter range forage for Rocky Mountain Elk (Cervus elaphus nelsoni) in the Blue Mountains of Oregon

Re-establishment of native perennial bunchgrasses in juniper/medusahead rangelands

Fire effects on vegetation diversity, structure, and successional dynamics in shrub-steppe and mixed conifer environments of the Hells Canyon, Idaho

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

Use of livestock to improve the quality of elk winter range forage in northeastern Oregon

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