Index Catalog // ScholarsArchive@OSU

Linkages among land use, riparian zones, and uptake and transformation of nitrate in stream ecosystems

Creator:: Sobota, Daniel J.
Abstract:: Land use alters the physical and biological structure of stream ecosystems and potentially alters their capacity to process nitrogen (N), an essential nutrient that has nearly doubled in abundance on the biosphere during the past century from human activities. In this dissertation, I quantified uptake and transformation of nitrate (NO₃⁻)...
Resource Type:: Dissertation
Full Text:: . Title: Linkages among Land Use, Riparian Zones, and Uptake and Transformation of Nitrate in Stream

An economic evaluation of on-farm strategies for reduction of nitrate groundwater pollution : the case of irrigated production in the Columbia basin

Creator:: Johnson, Scott Lee
Abstract:: Technological advances in agricultural production over the past 40 years have contributed to the high standard of living enjoyed by many in the United States. Extensive use of chemicals to enhance yield and improve crop quality has played a major role in creating this highly productive U.S. agricultural system. Increased...
Resource Type:: Dissertation
Full Text:: for continued monitoring. Oregon's Department of Environmental Quality has found nitrate levels up to

Hydrological and biogeochemical dynamics of nitrate production and removal at the stream – ground water interface

Creator:: Zarnetske, Jay P.
Abstract:: The feedbacks between hydrology and biogeochemical cycling of nitrogen (N) are of critical importance to global bioavailable N budgets. Human activities are dramatically increasing the amount of bioavailable N in the biosphere, which is causing increasingly frequent and severe impacts on ecosystems and human welfare. Streams are important features in...
Resource Type:: Dissertation
Full Text:: . Title: Hydrological and Biogeochemical Dynamics of Nitrate Production and Removal at the Stream

Effects of potato cropping practices on nitrate leaching in the Columbia basin

Creator:: McMorran, Jeffrey P.
Resource Type:: Dissertation
Full Text:: western Umatilla and northern Morrow counties by the Oregon Department of Environmental Quality (ODEQ

Analysis of Oregon's Domestic Well Testing Act data for use in a sentinel surveillance system for private well contaminants

Creator:: Hoppe, Brenda O.
Abstract:: The Safe Drinking Water Act ensures that public systems provide water that meets health standards. However, no such protection exists for millions of Americans who obtain water from private wells. Concern for safety is warranted as most wells draw from underground aquifers, and studies demonstrate that groundwater is affected by...
Resource Type:: Dissertation
Full Text:: – INTRODUCTION………………………………................. 1 Private Wells and Nitrate Contamination in Oregon………………… 8

A biogeochemical study of manganese in the estuarine zone

Creator:: Flegal, Arthur Russell
Resource Type:: Dissertation
Full Text:: invertebrate fecal pellets of the Alsea River, Oregon, and 3) Phase transformations of manganese under

The effects of environmental contaminants on the value of outdoor recreation : mercury and pheasant hunting in Oregon

Creator:: Shulstad, Robert N.
Resource Type:: Dissertation
Full Text:: environmental threat and telling of the harmful effects it could inflict. Final results of the Oregon

Environmental contaminants and ecology of bald eagles in southcentral Oregon

Creator:: Frenzel, Richard Wilmarth
Abstract:: Food habits and levels of organochlorine compounds, lead, and mercury in resident and wintering bald eagles were studied in southcentral Oregon and California, 1979-83. Food habits were assessed by examination of castings from winter communal roosts, identification of 2938 prey items found at nest sites and foraging areas, and observations...
Resource Type:: Dissertation
Full Text:: Title: Environmental Contaminants and Ecology of Bald Eagles in Southcentral Oregon Abstract approved

Investigations of runoff production and sedimentation on forest roads

Creator:: Wemple, Beverley C.
Abstract:: Forest roads constructed in steep mountain landscapes have been associated with a number of effects on hydrologic and geomorphic processes. This research examined the effects of forest roads on the flow of water and sediment in drainage basins in the Cascade range of western Oregon. A study conducted at the...
Resource Type:: Dissertation

The geomorphic significance of log steps in forest streams of the Oregon Coast Range

Creator:: Marston, Richard A.
Abstract:: A log step develops when large woody debris extends across the active channel, creating a change in the water surface elevation as the stream spills over the log step. By forming a series of vertical falls, log steps reduce the amount of potential energy available for conversion to kinetic energy...
Resource Type:: Dissertation
Full Text:: streams of the Oregon Coast Range AN ABSTRACT OF THE THESIS OF Richard Alan Marston for the degree of

ScholarsArchive@OSU

Linkages among land use, riparian zones, and uptake and transformation of nitrate in stream ecosystems

An economic evaluation of on-farm strategies for reduction of nitrate groundwater pollution : the case of irrigated production in the Columbia basin

Hydrological and biogeochemical dynamics of nitrate production and removal at the stream – ground water interface

Effects of potato cropping practices on nitrate leaching in the Columbia basin

Analysis of Oregon's Domestic Well Testing Act data for use in a sentinel surveillance system for private well contaminants

A biogeochemical study of manganese in the estuarine zone

The effects of environmental contaminants on the value of outdoor recreation : mercury and pheasant hunting in Oregon

Environmental contaminants and ecology of bald eagles in southcentral Oregon

Investigations of runoff production and sedimentation on forest roads

The geomorphic significance of log steps in forest streams of the Oregon Coast Range

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