Index Catalog // ScholarsArchive@OSU

Effectiveness of pheromone mating disruption for the ponderosa pine tip moth, Rhyacionia zozana (Kearfott) (Lepidoptera: Tortricidae), and its influence on the associated parasite complex

Creator:: Niwa, Christine Gail
Abstract:: The importance of pheromones in insect control relies both on their ability to reduce pest populations and on their relatively benign effects on nontarget organisms. This study was conducted to test the effectiveness of a pheromone application for mating disruption of the ponderosa pine tip moth, Rhyacionia zozana (Kearfott), and...
Resource Type:: Dissertation
Full Text:: Schowalter, and the members of my committee, Rene Feyereisen, Dave Perry, and David Birkes, for their

Effect of western juniper removal on ponderosa pine and associated understory vegetation

Creator:: Rose, Jeffrey A.
Abstract:: This research assessed the effect of western juniper (Junlperus occldentalls) removal on understory plant production and cover and ponderosa pine (Pinus ponderosa) growth and plant water status. A complete randomized block design, with four blocks and four treatments was established in the summer of 1984 near Prineville, Oregon. The four...
Resource Type:: Masters Thesis
Full Text:: , without letting me stray too far. Thanks to my committee members Drs. William Krueger, Dave Perry, and

Occupancy rates and habitat relationships of northern goshawks in historic nesting areas in Oregon

Creator:: Desimone, Steven M.
Abstract:: The ability of northern goshawks (Accipiter gentilis) to persist in intensively managed and selectively harvested forest habitats is largely unknown. To address the concern that populations of northern goshawks in eastern Oregon may be declining in response to habitat alteration, I studied occupancy rates and habitat relationships of nesting goshawks...
Resource Type:: Masters Thesis
Full Text:: addition to valuable guidance given by committee members Mike Collopy, Dave Perry, and Chuck Meslow, my

The importance of maintenance respiration by living cells in the sapwood of subalpine conifers

Creator:: Ryan, Michael G.
Abstract:: Xylem conducting tissue or sapwood is an important storage organ for water, carbohydrates, and nutrients, and this storage helps trees accommodate environmental change. However, the living ray parenchyma cells in sapwood, which store the carbohydrates and nutrients, require energy for maintenance. I examined how sapwood maintenance costs vary among species,...
Resource Type:: Dissertation

Development of two coniferous stands impacted by multiple, partial fires in the Oregon Cascades : establishment history and the spatial patterns of colonizing tree species relative to old-growth remnant trees

Creator:: Goslin, Matthew N.
Abstract:: Trees that survive disturbances can form a prominent legacy which may influence post-disturbance successional pathways. The effects of biological legacies on community dynamics is a critical question in ecology. In the present study, I examined two mapped stands in which old-growth remnant trees, survivors of partial fires, emerge above a...
Resource Type:: Masters Thesis

Interspecific competition in young Douglas-fir plantations of the Oregon coast range

Creator:: Wagner, Robert Gordon
Abstract:: Improving vegetation management decisions in Pacific Northwest forests requires a better understanding of the interactions between planted conifers and associated vegetation. A practical index of interspecific competition, and quantitative models predicting conifer performance from such an index are particularly needed. To meet this need, neighborhood models of interspecific competition were...
Resource Type:: Dissertation

Germination and first-year survival of red alder seedlings in the central Coast Range of Oregon

Creator:: Haeussler, Sybille
Abstract:: The role of disturbance in seed germination and first-year survival of red alder (Alnus rubra) was studied over two growing seasons at four sites representing a climatic gradient within the central Coast Range of Oregon. Disturbance affected red alder seed germination and seedling establishment by altering the temperature and moisture...
Resource Type:: Masters Thesis

Modeling riparian zone processes : biomass production and grazing

Creator:: Korpela, Edwin J.
Abstract:: Seasonal trends in forage production and environmental parameters for five plant community types within a northeastern Oregon riparian zone were described and modeled using correlation and path analysis. Wet meadows produced the greatest amount of herbage biomass, followed by moist bluegrass meadows, gravel bars, forests and dry bluegrass meadows. Trends...
Resource Type:: Dissertation
Full Text:: , Doug Johnson, Dave McIntire and Dave Perry. Their support and patience is greatly appreciated. A very

Response of ponderosa pine forests in central Oregon to prescribed underburning

Creator:: Landsberg, Johanna Dobrot
Abstract:: Tree growth and soil nutrient responses to prescribed underburning were determined for a period of up to 12 years at four sites in northcentral and central Oregon ponderosa pine stands (Pinus ponderosa Dougl. ex Laws). Differences reported are significant at a = 0.10. During the first 4-growing-season-measurement period after underburning,...
Resource Type:: Dissertation

Effects of seed characters and competitive environment on two-year performance of open-pollinated Douglas-fir families

Creator:: St. Clair, John Bradley
Abstract:: Ungerminated seed and recent germinants from 39 open-pollinated Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco) families were planted in each of three competitive environments in order to determine the degree to which growth differences among families are influenced by competitive environment, seed weight, and date of emergence. The three competitive...
Resource Type:: Dissertation

ScholarsArchive@OSU

Effectiveness of pheromone mating disruption for the ponderosa pine tip moth, Rhyacionia zozana (Kearfott) (Lepidoptera: Tortricidae), and its influence on the associated parasite complex

Effect of western juniper removal on ponderosa pine and associated understory vegetation

Occupancy rates and habitat relationships of northern goshawks in historic nesting areas in Oregon

The importance of maintenance respiration by living cells in the sapwood of subalpine conifers

Development of two coniferous stands impacted by multiple, partial fires in the Oregon Cascades : establishment history and the spatial patterns of colonizing tree species relative to old-growth remnant trees

Interspecific competition in young Douglas-fir plantations of the Oregon coast range

Germination and first-year survival of red alder seedlings in the central Coast Range of Oregon

Modeling riparian zone processes : biomass production and grazing

Response of ponderosa pine forests in central Oregon to prescribed underburning

Effects of seed characters and competitive environment on two-year performance of open-pollinated Douglas-fir families

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