Index Catalog // ScholarsArchive@OSU

Characteristics of soil organic matter in two forest soils

Creator:: Crow, Susan E.
Abstract:: Soil organic matter (SOM) is the terrestrial biosphere's largest pool of organic carbon (C) and is an integral part of C cycling globally. Soil organic matter composition typically can be traced directly back to the type of detrital inputs; however, the stabilization of SOM results as a combination of chemical...
Resource Type:: Dissertation
Full Text:: ; however, the stabilization of SOM results as a combination of chemical recalcitrance, protection from

The imprint of coarse woody debris on soil biological and chemical properties in the western Oregon Cascades

Creator:: Spears, Julie D. H.
Abstract:: The abundance and spatial heterogeneity of coarse woody debris (CWD) on the forest floor is a prominent feature of Pacific Northwest (PNW) forest ecosystems. The effect of CWD on soil solution chemistry, nutrient cycling and availability, soil physical structure and formation of soil organic matter, however, remains unknown. Therefore, studies...
Resource Type:: Dissertation
Full Text:: multiple comparison test. Treatments with different letters are significantly different at a=O.05. Zero

The fate of organic and inorganic nitrogen inputs in an old-growth forest of the central Oregon Cascade Range

Creator:: Holub, Scott M.
Abstract:: Forests in the Pacific Northwest receive very little nitrogen through atmospheric deposition and thus studying the nitrogen cycle in this region can provide insights into how the unpolluted nitrogen cycle functions. I examined the fate of organic nitrogen versus inorganic nitrogen and the effect of tamlins on N retention by...
Resource Type:: Dissertation
Full Text:: Abstract approved: Kate Lajtha Forests in the Pacific Northwest receive very little nitrogen through

Litter decay processes and soil nitrogen availability in native and cheatgrass-dominated arid rangelands

Creator:: Harrison, Kristen S.
Abstract:: As large-scale restorations of degraded rangelands are initiated, land managers need to understand how decades of dominance by the invasive annual grass, cheatgrass (Bromus tectorum L.), have altered ecosystem processes. One way to assess such alterations is by observing differences in decay rates, since decomposition is determined by factors such...
Resource Type:: Masters Thesis
Full Text:: approved David A. Pyke Kate Lajtha As large-scale restorations of degraded rangelands are initiated, land

Stream DOC, nitrate, chloride and SUVA response to land use during winter baseflow conditions in sub-basins of the Willamette River Basin, OR

Creator:: Frentress, Jay
Abstract:: To better understand the impact of land use on stream nutrient export, a synoptic sampling of 57 sub-basins within the Willamette River basin was conducted during winter baseflow conditions (February 2009). I assessed whether stream dissolved organic carbon (DOC), NO₃⁻ and Cl⁻ and specific ultra-violet absorbance (SUVA) values were correlated...
Resource Type:: Masters Thesis
Full Text:: =<#39#(AQ#/39#5M2<=6=<#?A41/QR=7A24#/P571P/3<2# Y%KL![#R/A?25#O212#<7112A/429#O=48#=39

Expression of secondary metabolites following manipulations of the C:N ratio in spotted knapweed, Centaurea maculosa Lam.

Creator:: Brodhagen, Marion L.
Abstract:: Spotted knapweed, Centaurea maculosa Lam. (Compositae) is an extremely successful introduced weed species in the northwestern United States. Multiple factors may be responsible for its success, including chemical defense. Two different types of putative chemical defense agents are the focus of this thesis. The first is a bitter-tasting sesquiterpene lactone,...
Resource Type:: Masters Thesis
Full Text:: . Abstract approved: Rick G. Kelsey and Kate Laj ha Spotted knapweed, Centaurea maculosa Lam. (Compositae

Characterization, epidemiology, and ecology of a virus associated with black raspberry decline

Creator:: Halgren, Anne B.
Abstract:: The objective of this study was to characterize an unknown agent associated with decline in black raspberry (Rubus occidentalis) in Oregon. A virus was found consistently associated with decline symptoms of black raspberries and was named Black raspberry decline associated virus (BRDaV). Double stranded RNA extraction from BRDaV-infected black raspberry...
Resource Type:: Dissertation
Full Text:: : Characterization, Epidemiology, and Ecology of a Virus Associated with Black Raspberry Decline. Abstract .aprud

Molecular characterization of a protein toxin involved in the Pyrenophora tritici-repentis/wheat interaction

Creator:: Tuori, Robert P.
Resource Type:: Dissertation
Full Text:: Molecular characterization of a protein toxin involved in the

Seasonality as a driving factor of decomposition pathways in both meadows and forests : an exploration across a gradient of climate in Oregon

Creator:: Colby, Samantha E.
Abstract:: Soil food webs process the majority of terrestrial carbon, and influence overall ecosystem function. A primary distinction among soil food webs is based on fungal versus bacterial pathways of decomposition; these lead to fundamentally different soil function, and are expected to differ in dominance between meadows and forests. This assumption...
Resource Type:: Masters Thesis
Full Text:: Plant Pathology presented on November 20, 2014. Title: Seasonality as a driving factor of

The effects of nitrogen manipulations and hydrology on the establishment and competitive abilities of wetland prairie plant species (western Oregon)

Creator:: Davis, Kimberly J.
Abstract:: Many studies suggest that weedy plant species are most successful when soil nitrogen in abundant. Consequently, I used soil nitrogen manipulations to determine if altering nitrogen would affect the establishment of both weedy and native plant species in a western Oregon wetland prairie. In two studies, we added carbon amendments...
Resource Type:: Dissertation
Full Text:: would affect the establishment of both weedy and native plant species in a western Oregon wetland

ScholarsArchive@OSU

Characteristics of soil organic matter in two forest soils

The imprint of coarse woody debris on soil biological and chemical properties in the western Oregon Cascades

The fate of organic and inorganic nitrogen inputs in an old-growth forest of the central Oregon Cascade Range

Litter decay processes and soil nitrogen availability in native and cheatgrass-dominated arid rangelands

Stream DOC, nitrate, chloride and SUVA response to land use during winter baseflow conditions in sub-basins of the Willamette River Basin, OR

Expression of secondary metabolites following manipulations of the C:N ratio in spotted knapweed, Centaurea maculosa Lam.

Characterization, epidemiology, and ecology of a virus associated with black raspberry decline

Molecular characterization of a protein toxin involved in the Pyrenophora tritici-repentis/wheat interaction

Seasonality as a driving factor of decomposition pathways in both meadows and forests : an exploration across a gradient of climate in Oregon

The effects of nitrogen manipulations and hydrology on the establishment and competitive abilities of wetland prairie plant species (western Oregon)

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