Index Catalog // ScholarsArchive@OSU

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

Scaling, ash-driven bistability, and other agents of soilscape genesis discovered while digitally mapping soils of the Blue Mountains, Oregon

Creator:: Almquist, Vance Warner
Abstract:: This dissertation reports on four related, though separate projects. The first project details the process of carrying out a digitally augmented soil mapping (DSM) effort alongside an ongoing survey in Oregon's Ochoco National Forest (ONF) using a Random Forest algorithm. The second chapter describes a initial soil survey in Oregon's...
Resource Type:: Dissertation
Full Text:: cataclysmic eruptive phase as presented in Matz,S., 1998

Assessing the role of reactive metal species in soil organic matter cycling using chemical imaging

Creator:: Keiluweit, Marco
Abstract:: Intimate associations with reactive metal species permanently protect soil organic matter (SOM) from microbial access and oxidation, contributing to the build-up of organic carbon (C) stocks in soils. It is increasingly recognized, however, that such associations can be reversible and that reactive metal species might even facilitate the oxidation of...
Resource Type:: Dissertation
Full Text:: , Jeremy Bougoure, Xavier Mayali, David Kilcoyne, Hans Bechtel, Matthew Marcus, Suet ‘Shirley’ Liu

Determining the Minimum Treatment Area and Importance of Soil Irrigation for Solarizing Soil Infested with Phytophthora spp.

Creator:: Bennett, Logan L.
Abstract:: Nurseries are an important part of the agriculture industry of the United States. The nursery industry provides ornamental, forest, restoration and specialty products to many markets in N. America. The disease sudden oak death, caused by Phytophthora ramorum, has devastating environmental and economic impacts on forested land, the urban-forest interface,...
Resource Type:: Masters Thesis
Full Text:: . CONTRIBUTION OF AUTHORS Thank you to George Hoffman and Ebba Peterson for their assistance with the

Contributions of ammonia-oxidizing bacteria and archaea to nitrification in forest soils

Creator:: Lu, Xinda
Abstract:: Prior to 2005, ammonia oxidation, the first step of nitrification, was thought mediated mainly by ammonia-oxidizing bacteria (AOB). However, the discovery of Thaumarchaeota carrying the genes coding for the ammonia monooxygenase (AMO) enzyme led to the discovery that ammonia-oxidizing archaea (AOA) also contribute to nitrification. Despite the uptick in studies...
Resource Type:: Masters Thesis
Full Text:: is no clear conclusion about the mechanism(s) controlling niche differentiation. A study was

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:: . 11 References Allison, S. D. (2005). Cheaters, diffusion and nutrients constrain decomposition by

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:: and lab setup: Rockie Yarwood, Jeremy Rich, Elizabeth Brewer, Rama Dhungel, Katie Tinnesand, and

Effects of long-term residue management and nitrogen fertilization on availability and profile distribution of nitrogen, phosphorus, and sulfur

Creator:: Christ, Robert A.
Resource Type:: Masters Thesis
Full Text:: systems to supply nitrogen (N), phosphorus (P), and sulfur (S). Ryegrass (Lolium Perenne L.), grown for

Linking soluble C to microbial community composition and dynamics during decomposition of ¹³C-labeled ryegrass

Creator:: McMahon, Shawna K.
Abstract:: Ryegrass residue consists of three main C fractions: readily available soluble C, intermediately available cellulose and hemicellulose, and slowly available lignin. Changes in chemical composition during decomposition influence rate of degradation as well as composition of the microbial community involved. Use of ¹³C-labeled plant material coupled with analysis of phospholipid...
Resource Type:: Masters Thesis
Full Text:: to work around. Thanks to Jeremy Rich, Stephanie Boyle, and Stacie Kageyama for being great

Plot-Scale Field Investigation : Characterizing Water Motion in Sandy Agricultural Soils

Creator:: Nolasco, Stephanie M.
Abstract:: Irrigated agricultural production in sandy soils presents several unique challenges to growers, including naturally high permeability, low native water retention, as well as high rates of water drainage losses and leaching of chemicals to the shallow aquifers. This study is an initial investigation into water motion in the sandy agricultural...
Resource Type:: Masters Thesis
Full Text:: for agricultural irrigation in the 1950’s and overall trends in nitrate contamination remain high

ScholarsArchive@OSU

Community composition and activities of denitrifying bacteria in soils

Scaling, ash-driven bistability, and other agents of soilscape genesis discovered while digitally mapping soils of the Blue Mountains, Oregon

Assessing the role of reactive metal species in soil organic matter cycling using chemical imaging

Determining the Minimum Treatment Area and Importance of Soil Irrigation for Solarizing Soil Infested with Phytophthora spp.

Contributions of ammonia-oxidizing bacteria and archaea to nitrification in forest soils

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

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

Effects of long-term residue management and nitrogen fertilization on availability and profile distribution of nitrogen, phosphorus, and sulfur

Linking soluble C to microbial community composition and dynamics during decomposition of ¹³C-labeled ryegrass

Plot-Scale Field Investigation : Characterizing Water Motion in Sandy Agricultural Soils

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