Search Constraints

Start Over
Filtering by: Subject Volcanism -- Oregon -- Cascade Range Remove constraint Subject: Volcanism -- Oregon -- Cascade Range Academic Affiliation Crop and Soil Science Remove constraint Academic Affiliation: Crop and Soil Science

Search Results

  • The link between nitrogen cycling and soil microbial community composition in forest soils of western Oregon

    Creator:
    Boyle, Stephanie A.
    Abstract:
    The objectives of this thesis were to examine the links between soil microbial community composition and function using the nitrogen (N) cycle as a model for these interactions and to assess the impact of environmental factors such as microclimate, vegetation type, and nutrient availability on microbial diversity and N transformations...
    Resource Type:
    Dissertation
    Full Text:
    Forest and Meadow Sites in the Cascade Mountains of Oregon

  • Community composition and activities of denitrifying bacteria in soils

    Creator:
    Rich, Jeremy J.
    Abstract:
    Few studies have directly compared denitrifying community composition and activities in soils by coupling molecular-genetic techniques and traditional measures of denitnfication. I investigated communities of denitrifying bacteria from adjacent meadow and forest soils in the Cascade Mountains, Oregon. A key gene in the denitrification pathway, N₂O reductase (nosZ), served as...
    Resource Type:
    Dissertation
    Full Text:
    from adjacent meadow and forest soils in the Cascade Mountains, Oregon. A key gene in the

  • Carbon cycling and priming of soil organic matter decomposition in a forest soil following glucose additions

    Creator:
    Diaz, David D.
    Abstract:
    Soils are a globally significant carbon (C) pool and have the potential to respond to elevated CO2 and environmental changes through positive feedback cycles that enhance the turnover of soil organic matter (SOM). Understanding the mechanisms governing the turnover of SOM is particularly important for modeling the fate of C...
    Resource Type:
    Masters Thesis
    Full Text:
    coniferous forest on the western side of the central Oregon Cascade Range. The fate of these small glucose

  • Microbial and biochemical dynamics of ectomycorrhizal mat and non-mat forest soils

    Creator:
    Kluber, Laurel A.
    Abstract:
    Dense hyphal mats formed by ectomycorrhizal (EcM) fungi are prominent features in Douglas-fir (Pseudotsuga menziesii) forest soils and have been estimated to cover up to 40% of the forest floor in some stands. Although previous studies have examined various aspects of EcM fungi, little is known about their associated microbial...
    Resource Type:
    Dissertation
    Full Text:
    the Western Cascade Mountains of Oregon (44˚13”25’N, 122˚15”30’W). Four old-growth and four second