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Evaluation of Restored Wetlands in the Greater Willamette Valley

Creator:: Leondar, Elizabeth A.
Abstract:: ABSTRACT Wetlands are considered critically important in the delivery of ecosystem services such as water quality improvement, flood protection, and conservation of native biodiversity. A common measure of the effectiveness of these ecosystem services is denitrification, an anaerobic microbial process that converts nitrate (NO3-), a common water pollutant, into dinitrogen...
Resource Type:: Undergraduate Thesis and Presentation

Response of soil microbial communities and nitrogen cycling processes to changes in vegetation inputs

Creator:: Brewer, Elizabeth Ann
Abstract:: Changes in the type and amount of plant inputs can occur gradually, as with succession, or rapidly, as with harvesting or wildfire. With global change it is anticipated that both gradual and immediate scenarios will occur at increasing frequency. Changes in vegetation inputs alter the quality and quantity of soil...
Resource Type:: Dissertation
Full Text:: ................................................................................................................... 108 Chapter 1: General Introduction Elizabeth A. Brewer 2

The link between nitrogen cycling and soil microbial community composition in forest soils of western Oregon

Creator:: Boyle, Stephanie A.
Abstract:: The objectives of this thesis were to examine the links between soil microbial community composition and function using the nitrogen (N) cycle as a model for these interactions and to assess the impact of environmental factors such as microclimate, vegetation type, and nutrient availability on microbial diversity and N transformations...
Resource Type:: Dissertation
Full Text:: Stephanie A. Boyle for the degree of Doctor of Philosophy in Soil Science presented on March 15, 2007

Soil community dynamics in sagebrush and cheatgrass-invaded ecosystems of the northern Great Basin

Creator:: DeCrappeo, Nicole M.
Abstract:: Sagebrush steppe ecosystems in the Great Basin have become increasingly threatened by the proliferation of cheatgrass (Bromus tectorum L.), an invasive annual grass. Diverse sagebrush and perennial bunchgrass landscapes can be converted to homogenous cheatgrass grasslands mainly through the effects of fire. Although the consequences of this conversion are well...
Resource Type:: Dissertation
Full Text:: . Witwicki contributed to experimental design and provided data for Chapter 3. Elizabeth A. Brewer and

Carbon cycling and priming of soil organic matter decomposition in a forest soil following glucose additions

Creator:: Diaz, David D.
Abstract:: Soils are a globally significant carbon (C) pool and have the potential to respond to elevated CO2 and environmental changes through positive feedback cycles that enhance the turnover of soil organic matter (SOM). Understanding the mechanisms governing the turnover of SOM is particularly important for modeling the fate of C...
Resource Type:: Masters Thesis
Full Text:: , the unexpected loss of my advisor and friend Elizabeth Sulzman was a frightening and confusing

Variation in communities of ammonia-oxidizing and denitrifying bacteria in Fennoscandian boreal forest soils

Creator:: Ghimire, Rama D.
Abstract:: The objective of this study was to examine the variation among ammonia-oxidizing and denitrifying communities in soils of a natural Fennoscandian boreal forest and of a forest with a long history of fertilization with different levels of nitrogen (N), and to examine whether there are any changes in the microbial...
Resource Type:: Masters Thesis
Full Text:: goes to Joan Sandeno for proof reading my thesis, my officemate Elizabeth Brewer for being a good

Microbial community dynamics associated with rhizosphere carbon flow

Creator:: Butler, Jessica L.
Abstract:: The cycling of root-deposited photo synthate (rhizodeposition) through the soil microbial biomass is widely recognized as a critical component of ecosystem functioning. Little is currently known about the flow of photosynthate through the microbial biomass however. My research goal was to examine if and how the flow of root-deposited photo...
Resource Type:: Masters Thesis
Full Text:: recognized as a critical component of ecosystem functioning. Little is currently known about the flow of

Diversity and Activity of Microbial Extracellular Peptidases in Soil

Creator:: Nguyen, Trang T. H.
Abstract:: Soil nitrogen exists largely as organic matter, including plant liter, dead animal matter, and microbial necromass. About 90% of soil organic nitrogen is proteinaceous material that is too large for plants and microorganisms to assimilate directly. Protein depolymerization therefore plays a critical role in mobilizing this organic source of nitrogen,...
Resource Type:: Dissertation
Full Text:: therefore plays a critical role in mobilizing this organic source of nitrogen, producing lower molecular

Effects of vegetation and disturbance on fungal communities in the western Cascades of Oregon

Creator:: Kageyama, Stacie Ann, 1967-
Abstract:: The use of high throughput molecular methods that allow for the study of bacterial communities in environmental samples is commonplace in microbial ecology. Until recently, fungal community ecology has focused on isolation, collection of sporocarps, or collection of ectomycorrhizal roots. The techniques used to extract and amplify DNA from environmental...
Resource Type:: Dissertation
Full Text:: Lajtha, Elizabeth Sulzman, and Bruce Caldwell for allowing me to be a part of the Detritus Input and

ScholarsArchive@OSU

Evaluation of Restored Wetlands in the Greater Willamette Valley

Response of soil microbial communities and nitrogen cycling processes to changes in vegetation inputs

The link between nitrogen cycling and soil microbial community composition in forest soils of western Oregon

Soil community dynamics in sagebrush and cheatgrass-invaded ecosystems of the northern Great Basin

Carbon cycling and priming of soil organic matter decomposition in a forest soil following glucose additions

Variation in communities of ammonia-oxidizing and denitrifying bacteria in Fennoscandian boreal forest soils

Microbial community dynamics associated with rhizosphere carbon flow

Diversity and Activity of Microbial Extracellular Peptidases in Soil

Effects of vegetation and disturbance on fungal communities in the western Cascades of Oregon

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