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  • Microbial community dynamics associated with rhizosphere carbon flow

    Creator:
    Butler, Jessica L.
    Abstract:
    The cycling of root-deposited photo synthate (rhizodeposition) through the soil microbial biomass is widely recognized as a critical component of ecosystem functioning. Little is currently known about the flow of photosynthate through the microbial biomass however. My research goal was to examine if and how the flow of root-deposited photo...
    Resource Type:
    Masters Thesis
    Full Text:
    , J.J. 2002. Stable isotopes and biomarkers in microbial ecology. FEMS Microbiology Ecology 40, 85-95

  • Linking soluble C to microbial community composition and dynamics during decomposition of ¹³C-labeled ryegrass

    Creator:
    McMahon, Shawna K.
    Abstract:
    Ryegrass residue consists of three main C fractions: readily available soluble C, intermediately available cellulose and hemicellulose, and slowly available lignin. Changes in chemical composition during decomposition influence rate of degradation as well as composition of the microbial community involved. Use of ¹³C-labeled plant material coupled with analysis of phospholipid...
    Resource Type:
    Masters Thesis
    Full Text:
    soil microbial ecology, an examination of current methodology and some of the limitations of PLFA

  • Litter controls of microbial community composition and function in forest soils

    Creator:
    Brant, Justin B.
    Abstract:
    Most carbon (C) transformations in soil are carried out by a diverse and complex soil microbial community. The size and composition of the soil microbial community is determined by poorly understood interactions between the quantity and chemical composition of plant inputs, as well as climate. Given the metabolic diversity of...
    Resource Type:
    Masters Thesis
    Full Text:
    Environmental Microbiology 64:4202-4209. 16 Atlas, R.M., and R. Bartha. 1998. Microbial Ecology

  • Functional profiles of soil microbial communities in second-growth Douglas-fir forests of the Pacific Northwest

    Creator:
    McGinnis, Megan L.
    Abstract:
    Forests are one of the largest repositories of terrestrial C. Understanding factors that drive organic matter transformations and nutrient efflux from these systems is therefore highly important. Temperate forests are of particular significance due to the large fraction of C that is stored below ground in the soil. Characterizing nutrient...
    Resource Type:
    Masters Thesis
    Full Text:
    presented on September 24, 2013. Title: Functional Profiles of Soil Microbial Communities in Second

  • Impact of Dairy Manure Digestate on Microbial Activities in Soil

    Creator:
    Waggoner, Ashley L
    Abstract:
    Amendments and fertilizers applied to optimize crop production and improve soil health also supply inputs of soil organic matter (SOM) and nutrients that affect soil microorganisms. In the dairy-intensive Pacific Northwest, dairy manure is stored as slurry mixtures until conditions are appropriate for soil application. During storage, the manure begins...
    Resource Type:
    Dissertation
    Full Text:
    : Impact of Dairy Manure Digestate on Microbial Activities in Soil. Abstract approved

  • Diversity and Activity of Microbial Extracellular Peptidases in Soil

    Creator:
    Nguyen, Trang T. H.
    Abstract:
    Soil nitrogen exists largely as organic matter, including plant liter, dead animal matter, and microbial necromass. About 90% of soil organic nitrogen is proteinaceous material that is too large for plants and microorganisms to assimilate directly. Protein depolymerization therefore plays a critical role in mobilizing this organic source of nitrogen,...
    Resource Type:
    Dissertation
    Full Text:
    Soil Science presented on March 19, 2019. Title: Diversity and Activity of Microbial

  • Response of soil microbial communities and nitrogen cycling processes to changes in vegetation inputs

    Creator:
    Brewer, Elizabeth Ann
    Abstract:
    Changes in the type and amount of plant inputs can occur gradually, as with succession, or rapidly, as with harvesting or wildfire. With global change it is anticipated that both gradual and immediate scenarios will occur at increasing frequency. Changes in vegetation inputs alter the quality and quantity of soil...
    Resource Type:
    Dissertation
    Full Text:
    microbial community composition and function in oak canopy and open grassland soils. Microbial Ecology

  • Soil community dynamics in sagebrush and cheatgrass-invaded ecosystems of the northern Great Basin

    Creator:
    DeCrappeo, Nicole M.
    Abstract:
    Sagebrush steppe ecosystems in the Great Basin have become increasingly threatened by the proliferation of cheatgrass (Bromus tectorum L.), an invasive annual grass. Diverse sagebrush and perennial bunchgrass landscapes can be converted to homogenous cheatgrass grasslands mainly through the effects of fire. Although the consequences of this conversion are well...
    Resource Type:
    Dissertation
    Full Text:
    species and Bromus tectorum. Restoration Ecology 15:44-52. Saetre, P. and J. M. Stark. 2005. Microbial

  • Evolution and ecology of the Ceanothus-Frankia symbiosis

    Creator:
    Jeong, Soon-Chun
    Abstract:
    The evolutionary relationship between Frankia and actinorhizal plants was evaluated by reconstructing molecular phylogenetic trees from nifH, 16S rDNA, and rbcL nucleotide sequences. Subgroupings in Frankia phylogenetic trees reconstructed from nifH and from 16S rDNA sequences were consistent in terms of plant origins of Frankia strains. Although the branching order...
    Resource Type:
    Dissertation
    Full Text:
    ECOLOGY OF THE CEANOTHUS- FRANKIA SYMBIOSIS Abstract approved: The evolutionary relationship between

  • The development and decline dynamics of two ectomycorrhizal fungal mat soil microbial communities in response to a reciprocal soil transfer experiment in old-growth Douglas-fir forests

    Creator:
    Cappellazzi, Jed E.
    Abstract:
    Ectomycorrhizal fungi (EmF) form symbioses with trees. These symbioses profoundly influence forest ecology. Certain EmF form specialized profusions of hyphae, known as ectomycorrhizal fungal mats (mats) which are visible to the naked eye, alter forest soil biogeochemistry, substantially contribute to soil microbial biomass/respiration and support unique microbial communities. Piloderma and...
    Resource Type:
    Masters Thesis
    Full Text:
    system, supported by over 30 years of research, to test difficult microbial ecology questions