Index Catalog // ScholarsArchive@OSU

Impacts of Reduced Tillage and Disturbance on Soil Health and Microbial Community Dynamics in Grass Seed Cropping Systems

Creator:: Zamora, Cesar G.
Abstract:: In Oregon perennial and annual grass seed cropping systems conservation management practices and their impacts on soil health and soil microbial community is not well understood. There is strong motivation to employ conservation tillage and other conservation practices to curb atmospheric carbon levels and improve soil health. However, the few...
Resource Type:: Masters Thesis
Full Text:: Systems. Abstract approved: ______________________________________________________ Kristin

Dilute Permanganate Preferentially Oxidizes Polyphenols Rather than Microbial Food: A Reinterpretation of a Common “Active Carbon” Measurement

Creator:: Christy, Isabel
Abstract:: “Active carbon” is a rapidly cycling soil organic carbon (SOC) fraction that acts as an energy and nutrient source for the microbial community. Dilute permanganate oxidation has been used to measure an “active carbon” fraction with the assumption that permanganate oxidation mimics enzymatic decomposition. Permanganate oxidizable carbon (PoxC) has become...
Resource Type:: Masters Thesis
Full Text:: . Thank you to Adam and Kristin from the OSU Soil Health Lab for all the joyful interactions and help

The Impact of Freeze-Thaw Cycles to the Physical and Biogeochemical Properties of Alaskan Permafrost Soils

Creator:: Rooney, Erin C.
Abstract:: Arctic warming is exposing thawing permafrost to repeated freeze-thaw, a disruptive process that can alter soil biogeochemistry and physical structure. To investigate the impact of permafrost exposure to freeze-thaw, soil response was tested across three scales: 2.5 cm³ aggregates, a forested hillslope, and two sites at contrasting latitudes. XCT imaging...
Resource Type:: Dissertation
Full Text:: express thanks to the OSU Soil Health Laboratory for their support, including Adam Fund and Kristin

Estimating Lime Requirement for Oregon Soils with Non-Hazardous Soil Test Methods

Creator:: Makepeace, Carl A.
Abstract:: Various soil tests are routinely used in the United States to predict soil lime requirement. New non-hazardous methods have recently been proposed for adoption in Oregon, however the accuracy of these methods for Oregon soils has not been established. The objectives of this investigation were: (a) to document and describe...
Resource Type:: Masters Thesis
Full Text:: from 1900 to 2020, (b) to evaluate the accuracy of five non-hazardous LRE methods for Oregon soils

Response of Soil Microbial Activity and Community Composition to Timber Harvest in an Oregon Douglas-Fir Forest

Creator:: Martin, Kelsey M.
Abstract:: Forests and forest soils are some of the largest biologically active carbon reservoirs in the world. Therefore, understanding how disturbances, such as forest harvest, influence biogeochemical cycling is particularly important for managing forests sustainably. Timber harvest can have large impacts on forest soils, which may affect the long-term productivity and...
Resource Type:: Masters Thesis
Full Text:: Kristin Kasschau for all her help with laboratory techniques. I also greatly appreciate my

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:: and become a better science writer. Dr. Kristin Kasschau, my lab manager, always gave me helpful

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:: Mittermaier, Swayne Hall, Tracy Mitzel, Emmalie Goodwin, Kristin Rafai, Kelley Morales, Elizabeth Seeno, Dr

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:: much of her knowledge, and always returned my emails, even two years after graduation! Kristin

Modeling Survival of Soilborne Phytophthora spp. and Characterizing Microbial Communities in Response to Soil Solarization and Biocontrol Amendment in Container Nursery Beds

Creator:: Funahashi, Fumiaki
Abstract:: In horticultural nurseries for container-grown plants, production and sales have been threatened by the presence of a quarantined plant pathogen, Phytophthora ramorum (causal agent of sudden oak death). Infested nursery beds are an important source of P. ramorum, which can initiate disease through movement with surface water to infect roots...
Resource Type:: Dissertation
Full Text:: , Kristin Kasschaw, Chris Klatt, and Ann Taylor in Myrold lab for providing pointed advice and discussion

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:: people: Anne Taylor, Andrew Giguere, Kristin Kasschau, Fumiaki Funahashi, Rachel Danielson. I also

ScholarsArchive@OSU

Impacts of Reduced Tillage and Disturbance on Soil Health and Microbial Community Dynamics in Grass Seed Cropping Systems

Dilute Permanganate Preferentially Oxidizes Polyphenols Rather than Microbial Food: A Reinterpretation of a Common “Active Carbon” Measurement

The Impact of Freeze-Thaw Cycles to the Physical and Biogeochemical Properties of Alaskan Permafrost Soils

Estimating Lime Requirement for Oregon Soils with Non-Hazardous Soil Test Methods

Response of Soil Microbial Activity and Community Composition to Timber Harvest in an Oregon Douglas-Fir Forest

Diversity and Activity of Microbial Extracellular Peptidases in Soil

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

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

Modeling Survival of Soilborne Phytophthora spp. and Characterizing Microbial Communities in Response to Soil Solarization and Biocontrol Amendment in Container Nursery Beds

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

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