Index Catalog // ScholarsArchive@OSU

Quantifying C and N contents and isotope signatures of SOM pools in the H. J. Andrews DIRT plots

Creator:: Keirstead, Heath
Abstract:: The mechanisms governing short- and long-term belowground carbon dynamics need to be understood. As part of a larger project developed to assess the effect of quantity and quality of litter inputs on the rate of soil organic matter (SOM) formation, I examined SOM in the H. J. Andrews Detritus Input...
Resource Type:: Masters Thesis
Full Text:: Signatures of SOM poois in the H. J. Andrews DIRT plots. Abstract approved: Elizabeth W. S The mechanisms

Community composition and activities of denitrifying bacteria in soils

Creator:: Rich, Jeremy J.
Abstract:: Few studies have directly compared denitrifying community composition and activities in soils by coupling molecular-genetic techniques and traditional measures of denitnfication. I investigated communities of denitrifying bacteria from adjacent meadow and forest soils in the Cascade Mountains, Oregon. A key gene in the denitrification pathway, N₂O reductase (nosZ), served as...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERTATION OF Jeremy J. Rich for the

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:: Basin. Abstract approved: Peter J. Bottomley David D. Myrold

Exploring mechanisms that drive the development of reversible soil hydrophobicity

Creator:: Woolverton, Priscilla B.
Abstract:: This study focuses on one widespread characteristic of poor soil quality: hydrophobic soil. Previous research has produced conclusive evidence to show that soil hydrophobicity is affected by soil organic matter (SOM) and soil water content (WC). Hydrophobicity that responds to changes in WC is a unique form of surface hydrophobicity...
Resource Type:: Masters Thesis
Full Text:: location.............................................................. 122 Appendix J A model for

Progress in the Search for Early Sites in the Lower Salmon River Canyon, Idaho: A Case Study in Geoarchaeological Prospection

Creator:: Lancaster, JD L.
Abstract:: The search for and discovery of early archaeological sites is an inherently geoarchaeological problem. Archaeological sites of late Pleistocene-age are known to be located in the Intermountain West, however, the record of these early sites remains limited to only a few examples. In the lower Salmon River canyon (LSRC), the...
Resource Type:: Masters Thesis
Full Text:: Facies I (Silt and Very Fine Sand Size Tephra) . . . . . . . . . . . . . 58 Facies J (Massive, Poorly

The Effects of Biofilm on Sandy Soil Hydrology

Creator:: Runion, Danielle N.
Abstract:: It is known that soil biota affects water dynamics through various complex mechanisms. The impact on retention by soil biota are due to a combination of changes to pore geometry, pore clogging by biofilms, biofilms that serve to connect thin water films across many pores as the soil dries, and...
Resource Type:: Masters Thesis

Measuring Electron Activity to Constrain the Role of Soil Structure in the Formation of Biogeochemical Heterogeneity

Creator:: Wanzek, Thomas
Abstract:: Soils have a critical role in global carbon (C) cycling, containing one of the largest fast-cycling carbon stocks on earth. Robust representation of soil organic matter dynamics in Earth System Models is critical for future climate prediction. Current C cycling models assume that all C cycling in non-hydric (i.e. ‘upland’)...
Resource Type:: Masters Thesis

Using Algal Biomass as a Fertilizer

Creator:: Cappellazzi, Shannon B.
Abstract:: Algae can be used in a variety of wastewater systems to capture nutrients while fixing carbon dioxide from the atmosphere. I conducted field trials at three locations in Oregon with both corn and potato crops to assess the agronomic value and environmental impact of using the resulting algal biomass as...
Resource Type:: Dissertation

The effects of the Mazama tephra-falls : a geoarchaeological approach

Creator:: Matz, Stephan E.
Abstract:: About 7,000 years ago two major tephra-falls blanketed the Pacific Northwest in volcanic ash. These two tephra-falls, identified as the Llao and climatic tephra-falls, were a part of the eruptive events that led up to the collapse of Mount Mazama to form Crater Lake in the southern Oregon Cascades. The...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Quantifying C and N contents and isotope signatures of SOM pools in the H. J. Andrews DIRT plots

Community composition and activities of denitrifying bacteria in soils

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

Exploring mechanisms that drive the development of reversible soil hydrophobicity

Progress in the Search for Early Sites in the Lower Salmon River Canyon, Idaho: A Case Study in Geoarchaeological Prospection

The Effects of Biofilm on Sandy Soil Hydrology

Measuring Electron Activity to Constrain the Role of Soil Structure in the Formation of Biogeochemical Heterogeneity

Using Algal Biomass as a Fertilizer

The effects of the Mazama tephra-falls : a geoarchaeological approach

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