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Autecological studies of two annual herbs, Senecio sylvaticus and Epilobium paniculatum : effects of biotic and abiotic factors

Creator:: Geyer, Melora Arnason
Abstract:: I used greenhouse and field studies to investigate how intraspecific and interspecific competition, soil disturbance, and fertilization affect the biomass and reproductive output of Senecio sylvaticus and Epilobium paniculatum, common winter annuals which invade and dominate western Cascades forests during the first two seasons after clearcutting and slashburning. Field work...
Resource Type:: Masters Thesis

Growth analysis of heterogeneous stands of ponderosa pine and lodgepole pine in central Oregon

Creator:: Mainwaring, Douglas B.
Abstract:: Basal area and height growth were analyzed for individual trees in uneven-aged ponderosa and lodgepole pine stands in central Oregon. Basal area growth was modeled as a function of other stand and tree variables to address five general objectives: 1) to compare the predictive ability of distance-dependent versus distance-independent stand...
Resource Type:: Masters Thesis
Full Text:: thank the other members of my committee, Mike Newton and Everett Hansen. I asked them to join the

Potato (Solanum tuberosum L.) tuber quality response to a transient water stress

Creator:: Eldredge, Eric P.
Resource Type:: Dissertation
Full Text:: irrigation research, and to Dr. Mike Newton, the Graduate Council Representative, for his insight during

Aerial forest operations : mineral amendment project

Creator:: Cornell, Jennie L.
Abstract:: A helicopter operations problem was studied for a private forest landowner testing an experimental application of minerals on Douglas-fir (Pseudotsuga menziesil) in the Coast Range of Oregon to offset growth reductions from Swiss needle cast disease. A planning approach was needed to minimize costs for transportation and aerial application of...
Resource Type:: Capstone Project
Full Text:: committee, Dr. Mike Newton, Dr. John Sessions, and Dr. Loren Kellogg for their support, guidance and

Conifer phytotoxicity and vegetation control efficacy of ten selected herbicides

Creator:: Coate, Jeremy E.
Abstract:: Ten herbicides (atrazine, azafenidin, chlorsulfuron, clopyralid, hexazinone, imazapic, imazapyr, metsulfuron, pendimethalin, and sulfometuron) were evaluated for phytotoxicity in first-year seedlings of eight conifer species (Douglas-fir, grand fir, noble fir, redwood, Sitka spruce, western hemlock, western red cedar, and western white pine). Six of these herbicides (atrazine, clopyralid, hexazinone, imazapyr, metsulfuron,...
Resource Type:: Masters Thesis

Silvicultural mechanical site preparation

Creator:: Moore, William Wardlaw
Abstract:: The preparation of suitable sites for planting and growing of tree seedlings following logging is recognized by British Columbia Forest Service as a major silvicultural problem in the Central and Northern Interior regions of the province. Over the past few decades, scarification trials have been made with various types of...
Resource Type:: Capstone Project

Fifth-year growth responses of Douglas-fir to crowding and other competition

Creator:: Cole, Elizabeth C.
Abstract:: This thesis examines the competitive aspects of Douglas-fir trees growing with two commonly associated competitors--red alder and grass--at varying densities. Two Nelder plots in three different environments in the Oregon Coast Range were studied. The sites represented the warm, dry climate of the Willamette Valley; the warm, moist climate of...
Resource Type:: Masters Thesis

Water relations and associated morphology of conditioned Douglas-fir and jack pine seedlings subjected to periods of drought stress

Creator:: McClain, K. M.
Abstract:: Significant post planting mortality of young conifer seedlings often occurs on drought prone sites because seedlings fail to either establish, or maintain favourable water relations. Survival is contingent upon growth which occurs when turgor pressure is above a threshold level. Since growth after planting is influenced by nursery cultural practices,...
Resource Type:: Dissertation

Performance of Leucaena, sorghum or cowpea and resource sharing in an agrisilviculture system in semi-arid India

Creator:: Osman, Mohammed, 1960-
Abstract:: In an agrisilviculture system, trees and crops compete for above and below ground resources. This study aimed at quantifying the effect of shoot pruning and root barriers around pollarded trees on the production of crop and tree components with and without application of fertilizer to the crop. Sorghum (1991 &...
Resource Type:: Dissertation

ScholarsArchive@OSU

Autecological studies of two annual herbs, Senecio sylvaticus and Epilobium paniculatum : effects of biotic and abiotic factors

Growth analysis of heterogeneous stands of ponderosa pine and lodgepole pine in central Oregon

Potato (Solanum tuberosum L.) tuber quality response to a transient water stress

Aerial forest operations : mineral amendment project

Conifer phytotoxicity and vegetation control efficacy of ten selected herbicides

Silvicultural mechanical site preparation

Fifth-year growth responses of Douglas-fir to crowding and other competition

Water relations and associated morphology of conditioned Douglas-fir and jack pine seedlings subjected to periods of drought stress

Performance of Leucaena, sorghum or cowpea and resource sharing in an agrisilviculture system in semi-arid India

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