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
Full Text:: Chemistry of a Meadow-to-Forest Transition in the Central Oregon Cascades. Abstract appro Kermit Cromack

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

Soil carbon and nutrient dynamics of windthrow chronosequences in spruce-hemlock forests of southern Alaska

Creator:: McClellan, Michael H.
Resource Type:: Dissertation

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

Ecosystem effects of vegetation removal in coastal Oregon Douglas-fir experimental plantations : impacts on ecosystem production, tree growth, nutrients, and soils

Creator:: Yildiz, Oktay
Abstract:: Effects of partial understory removal on belowground and aboveground ecosystem properties were investigated in 5 and 15 yr old Douglas-fir (Pseudotsuga menziesll (Mirb.) Franco) experimental plantations in western Oregon. Seedling survival was not affected by understory removal at age 5 yr. But through age 15 yr, understory removal increased seedling...
Resource Type:: Dissertation
Full Text:: outstanding committee members. would like to thank my advisor, Dr. Kermit Cromack, Jr., who helped me

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

Soil changes after afforestation in Yellow River loess : a case study in Gansu Province, People's Republic of China

Creator:: McCain, Cindy
Abstract:: Widespread erosion of the Yellow River loess plateau has led to serious soil and water conservation problems for north central China. In the DingXi District of Gansu Province, with less than 400 mm annual precipitation, terraced plantations for timber, fuel, or fodder form part of a large scale afforestation project...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

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

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

Soil carbon and nutrient dynamics of windthrow chronosequences in spruce-hemlock forests of southern Alaska

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

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

Ecosystem effects of vegetation removal in coastal Oregon Douglas-fir experimental plantations : impacts on ecosystem production, tree growth, nutrients, and soils

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

Soil changes after afforestation in Yellow River loess : a case study in Gansu Province, People's Republic of China

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