Index Catalog // ScholarsArchive@OSU

Ammonia-oxidizer and denitrifier populations in boreal forest soils of differing nitrogen availability

Creator:: Burton, Marci S.
Abstract:: Nitrification and denitrification are major biological processes transforming nitrogen (N) in soils to plant available N, highly leachable nitrate (NO₃⁻) and gaseous N oxides. Although many studies in the past have studied N cycling communities, the effect of increased N inputs on ammonia-oxidizer and denitrifier population dynamics is still under...
Resource Type:: Masters Thesis
Full Text:: ). Ammonia-oxidizing and denitrifying processes in soil are influenced by environmental factors, primarily

Analysis of Carbon-14 Transport from a Contaminated Groundwater Source

Creator:: Napier, Jonathan Bamberger
Abstract:: Radioecology observes the movement of radioactive isotopes throughout the environment. For radioecology, locations of study are limited to areas accidentally contaminated from a number of sources. The Chalk River Laboratories of Atomic Energy of Canada Limited have stored low level waste since the mid 1940s. In certain instances, the wastes...
Resource Type:: Dissertation
Full Text:: . Groundwater, soil gas, and plant samples were collected to observe vertical profiles of stable and

Assessing Soil Salinity from Produced Water Spills with Electromagnetic Induction : A Case Study on Cropland in Bottineau County, North Dakota

Creator:: Erickstad, Karen M.
Abstract:: Produced water is a highly saline waste product of oil and gas production, which is generated in larger volumes than the hydrocarbons themselves in the United States. Spillage of produced water is of concern because its high salinity can contaminate soil, surface water and groundwater resources, and kill vegetation, including...
Resource Type:: Masters Thesis
Full Text:: Karen M. Erickstad for the degree of Master of Science in Environmental Sciences presented on June 15

Essays on land-use change, carbon sequestration and emissions in China

Creator:: Li, Man
Abstract:: China has experienced rapid economic growth in the last twenty years, accompanied by large-scale land conversion, severe environmental degradation, and rising carbon dioxide (CO₂) emissions. Designing policies for sustainable development requires a comprehensive understanding of the relationship between economic growth, land-use change, carbon sequestration and emissions in China. This dissertation...
Resource Type:: Dissertation
Full Text:: growth in the last twenty years, accompanied by large-scale land conversion, severe environmental

Infiltration and temperature characterization of a wastewater hyporheic discharge system

Creator:: Stewart, Ryan D.
Abstract:: The Clean Water Act imposes Total Maximum Daily Load (TMDL) limits on pollutant concentrations within wastewater effluent; in Oregon, thermal discharge is one of the pollutants subject to regulation. The City of Woodburn, Oregon, funded a series of pilot scale studies to investigate the utility of natural systems to reduce...
Resource Type:: Masters Thesis
Full Text:: ........................................................... 16 2.3.5 Soil Hydraulic Parameters

Influence of log truck traffic and road hydrology on sediment yield in western Oregon

Creator:: Miller, Rebecca H.
Abstract:: An understanding of the factors that influence surface erosion from roads is necessary to prevent and mitigate sediment production from forest roads. This study investigated the impacts of log truck traffic and road hydrology on sediment yield from ten forest road segments in the foothills of the Cascade Mountains of...
Resource Type:: Masters Thesis
Full Text:: surface of bare soil which is then subject to erosion from surface runoff and raindrop splash

Long-term Ecohydrologic Response to Western Juniper (Juniperus occidentalis) Control in Semiarid Watersheds of Central Oregon : A Paired Watershed Study

Creator:: Ray, Grace L.
Abstract:: Rangelands span over 50% of the globe and approximately 70% of the United States. Although livestock production is an important use of rangelands, the benefits of rangelands are highly diverse. Humans find intrinsic value in protecting these unique and variable landscapes for wildlife, vegetation, and recreation enthusiasts. Woodland plant encroachment...
Resource Type:: Masters Thesis
Full Text:: of the study presented here were to: 1) Characterize vegetation-soil water interactions at the

Physiochemical mechanisms for the transport and retention of technetium

Creator:: Jansik, Danielle P.
Abstract:: Understanding the transport and retention of radionuclides in the environment is important for protecting freshwater supplies and minimizing impact to biologic systems. Technetium-99 (Tc⁹⁹) is a radionuclide of interest due to its long half-life (2.13 x 10⁵ years) and toxicity. In the form of pertechnetate (TcO₄⁻), Tc is expected to...
Resource Type:: Dissertation
Full Text:: Philosophy in Environmental Engineering presented on January 11, 2013. Title: Physiochemical Mechanisms

Response of Soil Microbially Mediated Nutrient Cycling and Community Structure to Timber Harvest in the Pacific Northwest

Creator:: Danielson, Rachel E.
Abstract:: Forest harvest persists as one of the most globally important industries, and crucially provides raw wood products for both building and fuel materials. Mechanistically complex abiotic and biotic processes curb ecosystem recovery following timber harvest and it is of great importance to understand the effects of this practice on biogeochemical...
Resource Type:: Masters Thesis
Full Text:: Response of Soil Microbially Mediated Nutrient Cycling and

Response of Soil Temperature, Moisture, and Respiration Two Years Following Intensive Organic Matter and Compaction Manipulations in Oregon Cascade Forests

Creator:: Gallo, Adrian Carlos
Abstract:: Forest soils contain a substantial portion of global terrestrial carbon stores. Forest management can influence the soil carbon pool and how soil organic matter functions. The long-term productivity of forests is an ongoing goal where land managers utilize biomass and timber. A site-specific understanding of intensively managed forests can ensure...
Resource Type:: Masters Thesis
Full Text:: , and the quantity of surface residue controls the soil heating potential. As many other researchers

Soil acidity in Oregon : understanding and using concepts for crop production

Creator:: Hart, John M. (John Mervyn), 1949-, Sullivan, Dan M. (Dan Matthew), 1954-, Anderson, Nicole P., Hulting, Andrew Gerald, Horneck, Donald Arthur, Christensen, Neil Walter, 1944-, and Oregon State University. Extension Service
Abstract:: Soil acidity, expressed by low soil pH, causes reduced crop growth and significant economic loss. It is the most commonly overlooked and poorly understood yield-limiting factor in western Oregon and a developing concern in eastern Oregon. This publication describes the concept of soil acidity and the limitations it causes for...
Resource Type:: Technical Report
Full Text:: Soil Acidity in Oregon: Understanding and Using Concepts

Spatial and temporal effects of atmospheric deposition, climate, and land management on forest nutrient cycling and biodiversity

Creator:: McDonnell, Todd C.
Abstract:: Emissions largely associated with the combustion of fossil fuels and agriculture has caused elevated atmospheric deposition of nitrogen (N) and sulfur (S) throughout much of the developed world. Increased atmospheric deposition of N and S can lead to soil and surface water acidification and affect forest soil nutrient supply. The...
Resource Type:: Dissertation
Full Text:: the developed world. Increased atmospheric deposition of N and S can lead to soil and surface water

Use of GIS software to map contaminant distributions and determine integrated dose for purposes of assessing impact to biota

Creator:: Myers, Margaret C.
Abstract:: The objective of this research was to estimate the radiological impact on various non-human biotas by the Fukushima Daiichi Nuclear power plant radiation release resulting from Japan's tsunami in March 2011 consistent with the recent recommendations of the International Commission on Radiological Protection. Soil concentration data given by Japan's Ministry...
Resource Type:: Masters Thesis
Full Text:: International Commission on Radiological Protection. Soil concentration data given by Japan’s Ministry of

ScholarsArchive@OSU

Ammonia-oxidizer and denitrifier populations in boreal forest soils of differing nitrogen availability

Analysis of Carbon-14 Transport from a Contaminated Groundwater Source

Assessing Soil Salinity from Produced Water Spills with Electromagnetic Induction : A Case Study on Cropland in Bottineau County, North Dakota

Essays on land-use change, carbon sequestration and emissions in China

Infiltration and temperature characterization of a wastewater hyporheic discharge system

Influence of log truck traffic and road hydrology on sediment yield in western Oregon

Long-term Ecohydrologic Response to Western Juniper (Juniperus occidentalis) Control in Semiarid Watersheds of Central Oregon : A Paired Watershed Study

Physiochemical mechanisms for the transport and retention of technetium

Response of Soil Microbially Mediated Nutrient Cycling and Community Structure to Timber Harvest in the Pacific Northwest

Response of Soil Temperature, Moisture, and Respiration Two Years Following Intensive Organic Matter and Compaction Manipulations in Oregon Cascade Forests

Soil acidity in Oregon : understanding and using concepts for crop production

Spatial and temporal effects of atmospheric deposition, climate, and land management on forest nutrient cycling and biodiversity

Use of GIS software to map contaminant distributions and determine integrated dose for purposes of assessing impact to biota

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