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Filtering by: Subject Douglas fir beetle -- Washington (State), Western Remove constraint Subject: Douglas fir beetle -- Washington (State), Western Non-Academic Affiliation Oregon State University. Graduate School Remove constraint Non-Academic Affiliation: Oregon State University. Graduate School

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  • Effect of plant date on subsequent seedling field performance

    Creator:
    Taylor, Michael Monroe
    Abstract:
    Douglas-fir (Psudotsuga menziesii (Mirb.) Franco) seedlings were outplanted on eight dates (every three weeks from mid-August 2005 through mid-January 2006). On each plant date, seedlings from a conventional dormancy (CONV) induction treatment, including moisture and nutrient stress, and a shortened daylength (SD) treatment were outplanted on three western Oregon sites...
    Resource Type:
    Masters Thesis
    Full Text:
    Douglas-fir and western larch seedlings in Eastern Washington. Of particular interest was the

  • The effects of stand density on the growth and microclimate of young Douglas-fir stands

    Creator:
    Woodruff, David R.
    Abstract:
    My objectives were to investigate the correlation of height and diameter growth in young Douglas-fir (Pseudotsuga menziesii) plantations with stand density, and to determine the effects of stand density on the canopy boundary layer conductance (g[subscript]ac) and microclimate characteristics of young Douglas-fir plantations. I measured annual height (h) and diameter...
    Resource Type:
    Masters Thesis
    Full Text:
    Washington. Each site consisted of test plantations of eight- and twelve-year-old Douglas-fir in initial

  • Identifying site characteristics that explain variation in Douglas-fir site productivity and stem form

    Creator:
    Magalska, Lauren E.
    Abstract:
    Foresters care about site productivity and stem quality in Douglas-fir plantations for many reasons. The profitability of forest land and the economic returns on silvicultural investments are directly related to site productivity. Thus, understanding the relationships among Douglas-fir productivity, stem form and site characteristics is important economically. My objective was...
    Resource Type:
    Masters Thesis
    Full Text:
    variation in Douglas- fir productivity and stem form throughout western Oregon and Washington by using

  • Height-related trends in structure and function of Douglas-fir foliage

    Creator:
    Woodruff, David R.
    Abstract:
    This dissertation investigated the impacts of tree height upon a range of physiological and structural characteristics of Douglas-fir foliage; relationships between structural and functional trends with height; and compensatory mechanisms that mitigate height-related growth constraints. Height-related trends in foliar physiological and anatomical characteristics were examined both within trees as well...
    Resource Type:
    Dissertation
    Full Text:
    trees was a 450-yr- old Douglas-fir /western hemlock (Pseudotsuga menziesii (Mirb.) Franco/Tsuga

  • Identifying candidate genes associated with cold adaptation in Douglas-fir using DNA microarrays

    Creator:
    Howe, Dana Kathryn
    Abstract:
    In forest trees from temperate and boreal regions, cold acclimation is an important adaptive trait that involves changes in gene expression and physiology. Genecological, quantitative genetic, and QTL studies have been used to study the genetics of cold acclimation in Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), but the genes responsible for...
    Resource Type:
    Masters Thesis
    Full Text:
    cold adaptation in populations of Douglas-fir from Oregon and Washington. I used two populations of

  • Evaluating the effectiveness of commonly used herbaceous weed control regimes in a Pacific Northwest conifer plantation

    Creator:
    Dinger, Eric
    Abstract:
    Early in the establishment of Pacific Northwest conifer plantations, herbaceous weeds often decrease seedling growth through competition for soil moisture during the dry summer months. Critical period studies have reported that reductions in competitive weed cover are necessary during the initial years of establishment to avoid reductions in seedling growth....
    Resource Type:
    Masters Thesis
    Full Text:
    ). 2007. Washington state climate data [accessed 30 January

  • Interference dynamics in mixed red alder/Douglas-fir forests

    Creator:
    D'Amato, Anthony W.
    Abstract:
    This study characterized the nature and dynamics of interference in mixed red alder (Alnus rubra Bong.)/Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) stands in the Pacific Northwest, USA. Long-term spatial and tree measurements from the Cascade Head (CH) and H.J. Andrews (HJA) Experimental Forests in western Oregon and Delezene Creek (DC), Washington...
    Resource Type:
    Masters Thesis
    Full Text:
    ) Experimental Forests in western Oregon and Delezene Creek (DC), Washington were utilized to investigate

  • Western larch resistance to Douglas-fir beetle attack

    Creator:
    Neal, Tiffany A.
    Abstract:
    Live western larch, Larix occidentalis Nutt., a tree species resistant to the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins, produces the monoterpene 3-carene in higher concentrations compared to Douglas-fir, the preferred host of D. pseudotsugae (Reed et al. 1986). The inhibitory effects on attraction to aggregation pheromones and toxicity of 3-carene to...
    Resource Type:
    Masters Thesis
    Full Text:
    relative resistance of live western larch to Douglas-fir beetle attack. lbe monoterpene 3-carene may

  • Response of needle-litter decomposition and soil nitrogen mineralization to logging-debris manipulation and competing vegetation control in western Oregon and Washington

    Creator:
    Meehan, Nathan Andrew
    Abstract:
    Growing societal demand for forest products is pressuring managers to increase productivity from a finite land area, and it is expected that increased supply will come mostly from expansion of intensively managed stands. The USDA Forest Service and numerous collaborators created the Long-Term Soil Productivity (LTSP) network of research sites...
    Resource Type:
    Masters Thesis
    Full Text:
    and growth of Douglas-fir stands in western Washington and Oregon. 14 1.3 Objectives