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  • The effects of logging on periphyton communities of coastal streams

    Creator:
    Hansmann, Eugene W. (Eugene William), 1933-
    Abstract:
    The purpose of this study was to investigate the effects of logging on the productivity, structure and biomass of a periphyton community developed in mountain streams. The three streams used in this investigation were located in the coast range of Lincoln County, Oregon. They were selected for similarity of habitat,...
    Resource Type:
    Dissertation
    Full Text:
    major professor, for his time, assistance, encouragement in the research and for his editorial efforts

  • Hydrogen peroxide oxidation of annual ryegrass lignin and utilization of the products by Rhodotorula mucilaginosa

    Creator:
    Rockhill, Robert Clayton
    Abstract:
    Annual ryegrass (Lolium multiflorum) a major grass seed crop in the Willamette Valley, Oregon, is presently burned in the fields after harvest, causing considerable air pollution and general wastage of a material which could be used in the manufacture of economically important products. The cellulosic component of straw is relatively...
    Resource Type:
    Dissertation
    Full Text:
    . M, L. Laver of the Department of Forest Products in consultation and literature and material

  • Wood properties and use of sensor technology to improve optimal bucking and value recovery of Douglas-fir

    Creator:
    Acuna, Mauricio A.
    Abstract:
    There are a number of wood properties which affect the quality of forest products such as lumber and pulp. Of these, wood density is considered by some to be the single most important physical characteristic because it is an excellent predictor of strength, stiffness, hardness, and paper-making capacities. Accurately assessing...
    Resource Type:
    Dissertation
    Full Text:
    (Noskowiak 1963; Forest Products Laboratory 1999). Lumber sawn from such logs is characterized by slope of

  • Spatial patterns of fuel management activities and their effects on wildfire behavior

    Creator:
    Kim, Young-Hwan
    Abstract:
    Fuel management has been used as an effective local strategy to reduce the undesirable consequences of wildfires. Many efforts toward scheduling of fuel management activities across a broader landscape have been proposed, with the hope of achieving larger landscape-scale management effects. However, scheduling of fuel management treatments across the broader...
    Resource Type:
    Dissertation
    Full Text:
    . USDA Forest Service, Intermountain Research Station, Ogden, UT, General Technical Report INT- 484

  • Attenuation of rainfall intensity by forest canopies

    Creator:
    Keim, Richard F.
    Abstract:
    Interception of precipitation by forest canopies has been found previously to reduce rainfall intensity, but this effect is poorly understood. The goal of this research is to quantify the attenuation of rainfall intensity by forest canopy interception, with the specific objective of estimating the contribution of this attenuation to hillslope...
    Resource Type:
    Dissertation
    Full Text:
    . The goal of this research is to quantify the attenuation of rainfall intensity by forest canopy

  • Education of American research astronomers, 1876-1941

    Creator:
    Hall, Robert Dale, 1947-
    Abstract:
    The education (particularly graduate education) of Americans who were active in astronomical research between 1876 and 1941 is assessed for its effectiveness in preparing the astronomers for careers in research. This period contains three dynamic changes: the growth of American astronomy in becoming the world's leading community of astronomers, the...
    Resource Type:
    Dissertation
    Full Text:
    AMERICAN RESEARCH ASTRONOMERS, 1876-1941. Abstract approval: The education (particularly graduate

  • Comparison and analysis of small area estimation methods for improving estimates of selected forest attributes

    Creator:
    Goerndt, Michael E.
    Abstract:
    One of the most common practices regarding estimation of forest attributes is the partitioning of large forested subpopulations into smaller areas of interest to coincide with specific objectives of present and future forest management. New estimators are needed to improve estimation of selected forest attributes in small areas where the...
    Resource Type:
    Dissertation
    Full Text:
    DISSERTATION OF Michael E. Goerndt for the degree of Doctor of Philosophy in Forest Resources presented

  • In-forest log segregation based on acoustic measurement of wood stiffness

    Creator:
    Amishev, Dzhamal Y.
    Abstract:
    To remain competitive, the forest products industry needs to look for new and innovative processes and technologies to not only reduce costs but also to recover more value through the entire seedling-to-customer forest products supply chain. It is well recognized that measuring wood properties of logs in real time during...
    Resource Type:
    Dissertation
    Full Text:
    applications………………..4 1.1.4 Mechanization and technologies in forest operations…………………...10 1.2 RESEARCH

  • Characterizing early-seral competitive mechanisms influencing Douglas-fir seedling growth, vegetation community development, and physiology of selected weedy plant species

    Creator:
    Dinger, Eric J.
    Abstract:
    Three studies were conducted to characterize and present early-seral competition between Douglas-fir seedlings and the surrounding vegetation communities during Pacific Northwest forest establishment. The first experiment served as the foundation for this dissertation and was designed to quantify tradeoffs associated with delaying forest establishment activities by introducing a fallow year...
    Resource Type:
    Dissertation
    Full Text:
    , precommercially thinned loblolly and shortleaf pines. Canadian Journal of Forest Research 29: 947-959

  • Trophic cascades and large mammals in the Yellowstone ecosystem

    Creator:
    Painter, Luke E.
    Abstract:
    Reintroduction of wolves to Yellowstone National Park (YNP) in 1995-96 provided a rare opportunity to observe the response of an ecosystem to the return of a top predator, including possible reversal of decades of decline of aspen, cottonwood, and tall willows suppressed by intensive herbivory on elk winter ranges. To...
    Resource Type:
    Dissertation
    Full Text:
    DISSERTATION OF Luke E. Painter for the degree of Doctor of Philosophy in Forest Resources presented on May