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  • Transformation of Western Hemlock Tree Crowns by Dwarf Mistletoe

    Creator:
    Calkins, Stephen J.
    Abstract:
    Hemlock dwarf mistletoe (Arceuthobium tsugense subsp. tsugense) is an arboreal, hemiparasitic plant that principally parasitizes western hemlock (Tsuga heterophylla). Hemlock dwarf mistletoe exerts a profound influence on infected trees that can drastically change the structure of the tree crown due to reduced growth, top dieback, branch deformation and death, resulting...
    Resource Type:
    Masters Thesis
    Full Text:
    decrease the efficiency of western hemlock foliage and affect the water transport efficiency of infected

  • Effect of high temperature drying on bending and shear strengths of western hemlock

    Creator:
    Thiam, Massamba
    Abstract:
    The advantages of high-temperature drying are faster drying, reduced inventory, reduced energy requirements, and reduced equilibrium moisture content. However the disadvantages are higher initial costs of the kiln, greater power needs, knot dropout, and reduction in some strength properties. The latter was the subject of this study. Three hundred pieces...
    Resource Type:
    Masters Thesis
    Full Text:
    of High Temperature Drying on Bending and Shear Strengths of Western Hemlock. Michael R. Milota

  • The impact of wood variability on the drying rate at different moisture content levels

    Creator:
    Berberović, Adin
    Abstract:
    Variability in wood properties causes boards within a stack of lumber to dry at different rates and reach different moisture content levels after drying is completed. The consequence is that the boards will have properties that differ from ones that were intended to be achieved by the drying process. The...
    Resource Type:
    Dissertation
    Full Text:
    behavior was investigated for western hemlock (Tsuga heterophylla) lumber. Board weights were

  • Early genetic selection for wood stiffness in juvenile Douglas-fir and western hemlock

    Creator:
    Urhan, Oguz S.
    Abstract:
    Wood modulus of elasticity (MOE), also known as wood stiffness, is one of the most important wood properties. Wood stiffness is a measure of the resistance to deflection, and is important because some products such as laminated veneer lumber, plywood, and dimension lumber require stiff and strong wood. Incorporating wood...
    Resource Type:
    Masters Thesis
    Full Text:
    Douglas fir and Western Hemlock. AN ABSTRACT OF THE THESIS OF Oguz S. Urhan for the degree of

  • Effects of release from suppression on hydraulic architecture, photosynthetic capacity and functional wood characteristics in Douglas-fir and western hemlock

    Creator:
    Renninger, Heidi
    Abstract:
    Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), a shade intolerant species, and western hemlock (Tsuga heterophylla (Raf.) Sarg.), a shade tolerant species, were compared to learn more about the temporal pattern of release from suppression in both species, whether hydraulic architecture or photosynthetic capacity constrain release and how wood functional properties change...
    Resource Type:
    Masters Thesis
    Full Text:
    equivalent minimum water potential, stomatal conductance of western hemlock was found to be more sensitive

  • Predators associated with hemlock woolly adelgid (Hemiptera: Adelgidae) infested western hemlock in the Pacific Northwest.

    Creator:
    Kohler, Glenn R.
    Abstract:
    The hemlock woolly adelgid, Adelges tsugae, is causing widespread mortality of eastern hemlock, Tsuga canadensis, in the eastern United States. In the West, A. tsugae causes negligible damage to western hemlock, Tsuga heterophylla. Host tolerance traits and presence of endemic predators may be contributing to the relative tolerance of western...
    Resource Type:
    Masters Thesis
    Full Text:
    Hemlock Woolly Adelgid (Hemiptera: Adelgidae) Infested Western Hemlock in the Pacific Northwest

  • Modeling the fixed bed drying characteristics of biomass particles

    Creator:
    Yang, Hai
    Abstract:
    The fixed bed drying of western hemlock and Douglas-fir biomass particles at temperatures ranging from 50°C to 200°C and air velocities from 0.3 to 0.9 m/s was investigated. The objectives were to describe the drying characteristics of the particles, fit a model for thin-layer drying, and develop and test a...
    Resource Type:
    Masters Thesis
    Full Text:
    fixed bed drying of western hemlock and Douglas-fir biomass particles at temperatures ranging from 50

  • Numerical simulation of wood drying

    Creator:
    Berberovic, Adin
    Abstract:
    A mathematical and then a numerical model were developed for simulating a convective batch lumber drying process. The model incorporates mass and heat transfer relationships within the lumber stack, as well as thermodynamic properties of the wood and drying air. It takes into account a change of air properties along...
    Resource Type:
    Masters Thesis
    Full Text:
    can be applied to western hemlock lumber. Based on the steps necessary to create and validate the

  • Impacts of dwarf mistletoe on the physiology of host Tsuga heterophylla trees as recorded in tree ring C and O stable isotopes

    Creator:
    Marias, Danielle E.
    Abstract:
    Dwarf mistletoes, obligate, parasitic plants with diminutive aerial shoots, have long-term effects on host tree water relations, hydraulic architecture, and photosynthetic gas exchange and can eventually lead to tree death. To investigate the long-term impacts of dwarf mistletoe on gas exchange of host western hemlock trees, I compared growth, gas...
    Resource Type:
    Masters Thesis
    Full Text:
    related to interception of water and fixed carbon. Water use of western hemlock (Tsuga heterophylla

  • Comparison of the water relations characteristics of woody plants in western Oregon

    Creator:
    Davis, Kent J.
    Abstract:
    I studied the water relations traits, twig conductivity, C'3 isotopic composition, and wood density of three conifer and five angiosperm species in western Oregon. This study took place from spring 2002 to fall 2003 on four sites. Species were selected to represent the diversity of drought tolerance of woody plants...
    Resource Type:
    Masters Thesis
    Full Text:
    Water Relations Characteristics of Woody Plants in Western Oregon. Abstract approved Donald B.Zobe