Index Catalog // ScholarsArchive@OSU

Biology and chemistry of a meadow-to-forest transition in the Central Oregon Cascades

Creator:: Heichen, Rachel S.
Abstract:: In this study, biological and chemical characteristics were determined for two high-elevation meadow-to-forest transitions located in the Central Oregon Cascades. The chloroform fumigation incubation method (CFIM) was used to determine microbial biomass C(MBC) and the N flush due to fumigation (NF), and meadow values were compared to forest values for...
Resource Type:: Masters Thesis

Evaluating methods for measuring soil-CO₂-efflux in artificial, controlled and natural ecosystems

Creator:: Nay, Stephan Mark
Resource Type:: Masters Thesis

Effects of burrowing by mountain beaver (Aplodontia rufa) on soil in a young forest in the Oregon Coast Range

Creator:: Russell, William Ogburn, 1964-
Abstract:: Soil effects from mountain beaver (Aplodontia rufa ) burrowing were investigated in Oregon Coast Range soils formed from Tyee sandstone. The potential for observed changes in soil to affect productivity was assessed. Soil horizons from mountain beaver mound soil and adjacent unmounded profiles were collected with a monolith-type quantitative sampler....
Resource Type:: Masters Thesis

Long-term effects of prescribed fire on nitrogen availability in ponderosa pine stands in central Oregon

Creator:: Monleon-Moscardo, Vicente J.
Abstract:: The effects of prescribed burning on the rates of recent litter decomposition, nitrogen and phosphorus release from litter, soil total and inorganic nitrogen pools, and net nitrogen mineralization were determined in ponderosa pine sites that had been burned 0.3, 5 or 12 years earlier. Prescribed burning decreased litter decomposition rates...
Resource Type:: Masters Thesis

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

Thinning and urea fertilization effects on emerging grand fir (Abies grandis) foliage and growth of western spruce budworm (Choristoneura occidentalis) larvae

Creator:: Savage, Thomas J.
Abstract:: The objective of this study was to determine how the balance of carbon to nitrogen in a grand fir ecosystem affects the chemistry of emerging grand fir foliage and the growth of western spruce budworm larvae. Forest plots in the grand fir zone of eastern Oregon were thinned, thinned and...
Resource Type:: Masters Thesis

Association of nitrogen-fixing bacteria with ectomycorrhizae in Douglas-fir

Creator:: Niu, Chih-Hao
Abstract:: Many higher plants have mycorrhizae associated with their roots. These structures are often essential for survival and growth (Harley & Smith 1983). Mycorrhizae are known for the abilities to enhance nutrient absorption. While nitrogen-fixing organisms are found as components of the mycorrhizosphere, mycorrhizal fungi are not presently known to fix...
Resource Type:: Masters Thesis

Effect of nitrogen fertilizer and irrigation on Acacia senegal seedling biomass and photosynthesis

Creator:: Warrag, Esam Eldin I.
Abstract:: Seedlings of Acacia senegal were grown in a glass greenhouse to study the effect of nitrogen and irrigation regimes on dry matter production and allocation to different plant organs, net photosynthesis per unit leaf area, and nitrogen content in the different plant organs. Ammonium nitrate (NH4NO3) was used in this...
Resource Type:: Masters Thesis

Leaf litter chemistry and decomposition in a Pacific Northwest Coniferous forest ecosystem

Creator:: Valachovic, Yana S.
Abstract:: The effects of initial leaf litter chemistry of 16 common coniferous and deciduous hardwoods and shrubs on their annual decomposition patterns were studied on the H.J. Andrews Experimental Forest (Oregon). Leaf litters were characterized by their chemical qualities, which included measurement of elemental fractions (C, N, P, K, Ca, Mg),...
Resource Type:: Masters Thesis

Forest macro-arthropods as potential indicators of ecosystem conditions in Western Idaho : an analysis of community composition, biological diversity, and community structure

Creator:: Ruby, Margaret E.
Abstract:: Adaptive ecosystem management is a new paradigm for managing federal forests which requires regular monitoring of ecosystem function and diversity to measure the effects of management. Managers need new strategies and tools to help them assess their progress in maintaining healthy, productive and biologically diverse forests. Biomonitoring of select forest...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Biology and chemistry of a meadow-to-forest transition in the Central Oregon Cascades

Evaluating methods for measuring soil-CO₂-efflux in artificial, controlled and natural ecosystems

Effects of burrowing by mountain beaver (Aplodontia rufa) on soil in a young forest in the Oregon Coast Range

Long-term effects of prescribed fire on nitrogen availability in ponderosa pine stands in central Oregon

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

Thinning and urea fertilization effects on emerging grand fir (Abies grandis) foliage and growth of western spruce budworm (Choristoneura occidentalis) larvae

Association of nitrogen-fixing bacteria with ectomycorrhizae in Douglas-fir

Effect of nitrogen fertilizer and irrigation on Acacia senegal seedling biomass and photosynthesis

Leaf litter chemistry and decomposition in a Pacific Northwest Coniferous forest ecosystem

Forest macro-arthropods as potential indicators of ecosystem conditions in Western Idaho : an analysis of community composition, biological diversity, and community structure

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