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Creator:: Dosskey, Michael G.
Abstract:: Douglas-fir seedlings were inoculated with different species of ectomycorrhizae-forming fungi in order to test the concept that ectomycorrhizae enhance the drought tolerance of seedlings and to investigate the mechanisms responsible for this effect. Seedlings were transplanted at age 6 to 8 weeks into pots containing pasteurized loam soil and inoculated...
Resource Type:: Dissertation
Full Text:: Michael G. Dosskey for the degree of Doctor of Philosophy in Soil Science presented on March 14. 1989

Creator:: Karl, Michael G.
Abstract:: Reforesting harvested lands in southwestern Oregon has been difficult because of low rainfall, high evaporative demand, and competitive understory vegetation. Herbicides have been a preferred method to control competing vegetation but herbicide use on federal lands was curtailed in 1984. As a result, interest in livestock grazing as a vegetation...
Resource Type:: Dissertation
Full Text:: Oregon's southern Cascades AN ABSTRACT OF THE THESIS OF Michael G. Karl for the degree of Doctor of

Creator:: McWilliams, Michael G.
Abstract:: Port-Orford-cedar (Chamaecyparis lawsoniana) is a forest tree native to a small area of Oregon and California. A root disease caused by Phytophthora lateralis causes widespread mortality of Port-Orford-cedar. This dissertation examines three important elements of the Port-Orford-cedar P. lateralis pathosystem related to breeding for disease resistance: use of resistant rootstocks...
Resource Type:: Dissertation
Full Text:: Michael G. McWilliams for the degree of Doctor of Philosophy in Botany and Plant Pathology presented on

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

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