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Filtering by: Committee Member Lajtha, Kate Remove constraint Committee Member: Lajtha, Kate Resource Type Dissertation Remove constraint Resource Type: Dissertation

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Tracing Sources of Soil Organic Matter Through Time, Across Ecosystems, and Down Soil Profiles

Creator:

Gallo, Adrian Carlos

Abstract:

Soils contain the largest pool of carbon that is actively cycling on human timescales, leading many to view soils as a natural climate solution with multiple co-benefits. The field of soil science is rapidly evolving, but without a unified understanding of soil carbon dynamics. This dissertation leverages two distinct long-term...

Resource Type:

Dissertation
Non-Destructive Detection and Monitoring of Durability Issues in Wood Panels under Accelerated-Weathering

Creator:

Laleicke, Paul Frederik

Abstract:

Many wood composites are known to poorly resist the effects of moisture and temperature extremes over time. Degradation of adhesive bonds, irreversible thickness swell and dimensional instability result in a decrease of properties and a possible failure of the material. Accelerated weathering has become an essential tool for assessment of...

Resource Type:

Dissertation
Hydrologic and Land Cover Effects on Sources and Fate of In-Stream Fluorescent Dissolved Organic Matter

Creator:

Lee, Baek Soo P.

Abstract:

Dissolved organic matter (DOM) is a critical component of the carbon cycle linking terrestrial and aquatic ecosystems. Although many factors influence DOM fluxes and quality in rivers, controls on DOM compositions in catchments of the western U.S. are poorly understood. UV and fluorescent spectroscopy is a simpler, faster, and less...

Resource Type:

Dissertation
Wood-adhesive bondline analyses with micro x-ray computed tomography

Creator:

Paris, Jesse Loren

Abstract:

There is no doubt that adhesive penetration plays an important role in wood bondline joint performance and durability; yet, to date there is no direct experimental evidence linking penetration depth with bond performance. This is, in part, because adhesive penetration is commonly assessed with various 2D microscopy techniques that are...

Resource Type:

Dissertation
Dose-effects relationships in non-human biota : development of field sampling, dosimetric and analytic techniques through a case study of the aquatic snail Campeloma decisum at Chalk River Laboratories

Creator:

Ruedig, Elizabeth B.

Abstract:

In the last decade regulatory bodies have begun to implement standards to protect populations of non-human biota (NHB) from the consequences of radiation exposure. This is a departure from previous regulatory frameworks which were concerned only with protecting man. The implementation of these new standards has started an ongoing discussion...

Resource Type:

Dissertation
The effects of nitrogen manipulations and hydrology on the establishment and competitive abilities of wetland prairie plant species (western Oregon)

Creator:

Davis, Kimberly J.

Abstract:

Many studies suggest that weedy plant species are most successful when soil nitrogen in abundant. Consequently, I used soil nitrogen manipulations to determine if altering nitrogen would affect the establishment of both weedy and native plant species in a western Oregon wetland prairie. In two studies, we added carbon amendments...

Resource Type:

Dissertation
Development of rapid visual screening tool for seismic evaluation of wood-frame dwellings

Creator:

Lucksiri, Kraisorn

Abstract:

During the past several decades, earthquakes have caused extensive damage to buildings, including wood-frame, single-family dwellings, in the United States. In order to mitigate future losses, existing buildings in earthquake prone areas should be evaluated for their seismic safety. This is also an important issue for buildings in Oregon due...

Resource Type:

Dissertation
Microbial community structure as influenced by season and stand age in a Douglas-fir (Pseudotsuga menziesii) ecosystem

Creator:

Kucera, Jennifer Moore

Abstract:

Forest harvest can have significant impacts on forest ecosystems that may influence the capacity of soils to sequester carbon (C). The microbial community controls decomposition, which is a critical process in partitioning litter- and root-C between CO₂ and storage in semi-permanent soil-C pools. The objectives of this study were to...

Resource Type:

Dissertation
Response of soil microbial communities and nitrogen cycling processes to changes in vegetation inputs

Creator:

Brewer, Elizabeth Ann

Abstract:

Changes in the type and amount of plant inputs can occur gradually, as with succession, or rapidly, as with harvesting or wildfire. With global change it is anticipated that both gradual and immediate scenarios will occur at increasing frequency. Changes in vegetation inputs alter the quality and quantity of soil...

Resource Type:

Dissertation
Patterns of nitrogen fluxes in watersheds of the H.J. Andrews Experimental Forest, OR

Creator:

Vanderbilt, Kristin Lynn, 1967-

Abstract:

Seasonal and annual patterns of N fluxes and concentrations in streamwater in six conifer-dominated watersheds at the H.J. Andrews Experimental Forest, OR, were studied to gain insight into the factors that influence N retention in this ecosystem. Processes affecting N flux in streamwater differed between organic (DON) and inorganic (DIN;...

Resource Type:

Dissertation

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Academic Affiliation

Wood Science and Engineering3
Crop and Soil Science2
Forest Science2
Botany and Plant Pathology1
Forest Engineering Resources and Management1
more Academic Affiliations »

Advisor

Kamke, Frederick A.2
Campana, Michael E.1
Dick, Richard P.1
Flick, Lawrence B.1
Gupta, Rakesh1
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Commencement Year

Commencement Year range begin – Commencement Year range end

Current results range from 2001 to 2023

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Committee Member

Lajtha, Kate[remove]14
Adams, Paul W.1
Bottomley, Peter J.1
Boutton, Thomas W.1
Carozza, Susan E.1
more Committee Members »

Creator

Brewer, Elizabeth Ann1
Davis, Kimberly J.1
Gallo, Adrian Carlos1
Kucera, Jennifer Moore1
Laleicke, Paul Frederik1
more Creators »

Date

Date range begin – Date range end

Current results range from 2000 to 2022

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Decade

2020-20291
2010-20196
2000-20097

Degree Field

Forest Science2
Soil Science2
Wood Science2
Botany and Plant Pathology1
Civil Engineering1
more Degree Fields »

Degree Level

Doctoral14

Degree Name

Doctor of Philosophy (Ph.D.)14

File Format

application/pdf1

Language

English [eng]14

License

All rights reserved11

Location

North America, , (Area)1

Non-Academic Affiliation

Oregon State University. Graduate School13

Peer Reviewed

No12

Resource Type

Dissertation[remove]14

Rights Statement

In Copyright12
Copyright Not Evaluated2

Subject

Nitrogen cycle -- Oregon -- H.J. Andrews Experimental Forest2
Adhesives -- Imaging1
Burning of land -- Indonesia -- Remote sensing1
Campeloma -- Radioactive contamination -- Ontario1
Carbon cycle (Biogeochemistry) -- Washington (State) -- Gifford Pinchot National Forest1
more Subjects »

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