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  • Foliar respiration in an old-growth coniferous forest

    Creator:
    Cooper, Clifton E.
    Abstract:
    Foliar respiration forms a large component of the carbon balance of any coniferous forest. We examine seasonal, interannual, spatial and interspecific variation of foliar maintenance respiration in a forest in Washington, USA, with measurements made quarterly for >4 years on 400-year old trees of Pseudotsuga menziesii, Tsuga heterophylla and Thuja...
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    Respiration in an Old-Growth Coniferous Forest. Abstract approved: Foliar respiration forms a large

  • Measuring and Modeling the Structure of Coniferous Trees with Point Clouds Data

    Creator:
    Fang, Rong
    Abstract:
    Coniferous trees are a major North American crop that has been intensively managed for its commercial value, while also serving as critical habitat for abundant wildlife and as carbon sinks. Having diverse functions, North American temperate coniferous forests have become a research hotspot for numerous scientific studies aiming to integrate...
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    Dissertation
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    . Title: Measuring and Modeling the Structure of Coniferous Trees with Point Clouds Data

  • Dry coniferous forests in the Western Oregon Cascades

    Creator:
    Means, Joseph E.
    Abstract:
    Pseudotsuga menziesii dominates the forests of the Pacific Northwest. But though it is dominat, Tsuaa heteroohylla or Abies amabilis is usually climax. Many researchers have studied Pseudotsuga on the widespread mesic sites where it is seral, but few have examined the relatively rare ecosystems in which Pseudotsuga or its associate...
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    Dissertation
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    variation in plant moisture stress on dry and modal H.J. Andrews reference stands 13 Dry coniferous forest

  • Historical forest succession and disturbance dynamics in Coastal Douglas-fir forests in the southern western Cascades of Oregon

    Creator:
    Merschel, Andrew G.
    Abstract:
    Coastal Douglas-fir (Pseudotsuga menziesii var menziesii) forests are extensive west of the crest of the Cascade Mountains in Oregon and Washington and are renowned for their productivity, biodiversity, and the ecosystem services they provide. Increasing wildfire activity in recent years including the extensive 2020 Labor Day fires, and a warming...
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    . Merschel for the degree of Doctor of Philosophy in Forest Ecosystems and Society presented on September 17

  • Using soil data to enhance modeling of forest responses to climate change

    Creator:
    Peterman, Wendy L.
    Abstract:
    The over-arching theme of this work is that soil data affect the performance and realism of vegetation models with particular focus on their ability to predict or explain disturbances such as fire or disease. We tested the sensitivity of the Excel version of the 3-PG model to soil properties and...
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    : Using Soil Data to Enhance Modeling of Forest Responses to Climate Change. Abstract approved

  • The use of remote sensing for characterizing forests in wildlife habitat modeling

    Creator:
    Vogeler, Jody C.
    Abstract:
    Spatially explicit maps of habitat relationships have proven to be valuable tools for conservation and management applications including evaluating how and which species may be impacted by large scale climate change, ongoing fragmentation of habitat, and local land-use practices. Studies have turned to remote sensing datasets as a way to...
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    FOR CHARACTERIZING FOREST IN WILDLIFE HABITAT MODELING CHAPTER 1: INTRODUCTION Understanding

  • Development of a hybrid modeling framework for intensively managed Douglas-fir plantations in the Pacific Northwest

    Creator:
    Weiskittel, Aaron R.
    Abstract:
    Forest growth models in the Pacific Northwest are predominantly empirical. Predictions of yield under alternative silvicultural regimes cannot rely completely on field trials; yet empirical growth models are often inadequate for extrapolating untested regimes and genotypes. The limitations of current models include (1) long time-steps (e.g. 5-10 years); (2) insufficient...
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    forest nutrition (Kimmins, 1985). The hybrid modeling approach may be an important advancement in

  • Modeling sage-grouse habitat using a state-and-transition model

    Creator:
    Evers, Louisa
    Abstract:
    Habitat for wildlife species that depend on sagebrush ecosystems is of great management concern. Evaluating how management activities and climate change may affect the abundance of moderate and high-quality habitat necessitates the development of models that examine vegetation dynamics, but modeling tools for rangeland systems are limited. I developed state-and-transition...
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    presented on November 9, 2010. Title: Modeling Sage-Grouse Habitat Using a State-and-Transition Model

  • Modeling Forest Response to Changing Climate Conditions in Western North America

    Creator:
    Hawkins, Linnia R.
    Abstract:
    Forests play an integral role in the global carbon cycle, regulating the atmospheric CO₂ concentration by sequestering nearly one third of anthropogenic carbon emissions and storing carbon for centuries. Forest ecosystems are integrated into the culture, ecology, and economy of western North America, supporting wildlife habitat, local economies, recreation, and...
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    , 2019. Title: Modeling Forest Response to Changing Climate Conditions in Western North America

  • The effects of forest fuel reduction on fire severity and long-term carbon storage

    Creator:
    Mitchell, Stephen Richard
    Abstract:
    Two forest management objectives being debated in the context of federally managed landscapes in the US Pacific Northwest involve a perceived trade-off between fire restoration and C sequestration. The former strategy would reduce fuel (and therefore C) that has accumulated through a century of fire suppression and exclusion that has...
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    characteristics are summarized in Table 2.2. Modeling All simulations used version 4.1.2 of the Biome-BGC

  • The effect of levels of cooperation within physical science laboratory groups on physical science achievement

    Creator:
    Chang, Huey-por
    Abstract:
    The purpose of this study was to investigate the effect of the levels of group cooperation on students' achievement during a series of physical science laboratory activities. Six intact seventh grade physical science classes taught by two teachers, with each teacher instructing three classes, were selected from two middle schools....
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    investigate the effect of the levels of group cooperation on students' achievement during a series of

  • Characteristics of soil organic matter in two forest soils

    Creator:
    Crow, Susan E.
    Abstract:
    Soil organic matter (SOM) is the terrestrial biosphere's largest pool of organic carbon (C) and is an integral part of C cycling globally. Soil organic matter composition typically can be traced directly back to the type of detrital inputs; however, the stabilization of SOM results as a combination of chemical...
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    : Characteristics of Soil Organic Matter in Two Forest Soils Abstract approved Soil organic matter (SOM) is the

  • Analysis of the regional carbon balance of Pacific Northwest forests under changing climate, disturbance, and management for bioenergy

    Creator:
    Hudiburg, Tara W.
    Abstract:
    Atmospheric carbon dioxide levels have been steadily increasing from anthropogenic energy production, development and use. Carbon cycling in the terrestrial biosphere, particularly forest ecosystems, has an important role in regulating atmospheric concentrations of carbon dioxide. US West coast forest management policies are being developed to implement forest bioenergy production while...
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    OF THE DISSERTATION OF Tara M. Hudiburg for the degree of Doctor of Philosophy in Forest Science

  • Analysis and prediction of patterns in lichen communities over the western Oregon landscape

    Creator:
    Peterson, Eric B.
    Abstract:
    The diverse lichen flora of the Pacific Northwest is being impacted by population growth and by forest management practices. Accumulating information about our lichen flora will improve our conservation strategies. This dissertation first collects information to improve our understanding of how lichen communities vary among forests of differing structure, and...
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    forest management practices. Accumulating information about our lichen flora will improve our

  • Biogeochemical signals of mountainous forested watersheds' response to disturbance

    Creator:
    Guerrero-Bolaño Francisco J.
    Abstract:
    Small mountainous watersheds are disproportionate sources of land-derived particulate organic matter (POM) to long-term sinks like lake bottoms and the ocean. As such, these ecosystems are an essential component of the global carbon cycle. The burial of POM in lacustrine and marine sediments contributes to the drawdown of atmospheric CO2...
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    Francisco Jose Guerrero Bolaño for the degree of Doctor of Philosophy in Sustainable Forest Management and

  • Modeling Tree Size Distribution in Young Douglas-fir Plantations to Facilitate Tree List Generation for Growth Model Initiation at Different Ages and under Differing Silvicultural Regimes

    Creator:
    Uranga, Martin
    Abstract:
    Two key challenges emerge when initiating individual-tree growth models for bare ground or very young plantations. Both involve the need for a list of individual trees with known or predicted size and known expansion factor (number of trees per unit of area represented by each tree). In the case of...
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    are not typically measured or knowable in forest operations. From a modeling perspective, these

  • Modeling changes in flexural properties of softwood beams during fungal decomposition

    Creator:
    Mitsuhashi Gonzalez, June M.
    Abstract:
    Moisture intrusion in residential structures can lead to substantial fungal decay and this damage costs billions in repair/replacement costs. The extent of damage and the rate at which it occurs are primarily dependent on the wood moisture content and temperature in the structure. Determining the risk of decay for various...
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    10, 2010. Title: Modeling Changes in Flexural Properties of Softwood Beams during Fungal

  • Ecosystem Photosynthesis and Forest-Atmosphere Interactions Inferred from Carbonyl Sulfide

    Creator:
    Rastogi, Bharat
    Abstract:
    An increase in anthropogenic activities since the industrial revolution, primarily due to burning of fossil fuels and changes in land cover, has resulted in a steady increase in the global mean atmospheric CO2 concentrations. While there is unequivocal scientific evidence on global warming and its multidimensional impacts on natural and...
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    old growth coniferous forest. This dissertation is composed of three studies conducted at the Wind

  • Modeling Fine-scale Avian Distributions and Densities with Multi-scale Models: Predicting the Past and Present

    Creator:
    Hallman, Tyler A.
    Abstract:
    Models of a species’ distribution and models of a species’ spatially explicit density are valuable tools for conservation. They allow researchers to estimate changes in distributions, densities, and populations, based on changing environmental conditions. To trust such estimates, however, the quality of models is exceedingly important. Model performance can be...
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    Dissertation
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    . Title: Modeling Fine-scale Avian Distributions and Densities with Multi-scale Models: Predicting the

  • 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...
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    for the degree of Doctor of Philosophy in Sustainable Forest Management presented on 12 October 2022