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Filtering by: Creator Norman, D. W. (David W.) Remove constraint Creator: Norman, D. W. (David W.) Contributor advisor sim Myrold, David D. Remove constraint Contributor advisor sim: Myrold, David D.

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  • Nitrogen dynamics in red alder

    Creator:
    Swanston, Christopher W.
    Abstract:
    Red alder (Alnus rubra Bong.) is recognized as an important source of nitrogen to ecosystems that it inhabits. I examined N dynamics within alder trees, alder leaf litter, and the soil beneath alder leaf litter. ¹⁵Nitrogen, a stable isotope of N, was used as a tracer to follow the movement...
    Resource Type:
    Masters Thesis

  • Soil pH and calcium effects on nodulation of nursery grown red alder

    Creator:
    Crannell, Wanda K.
    Resource Type:
    Masters Thesis
    Full Text:
    CALCIUM EFFECTS ON NODULATION OF NURSERY GROWN RED ALDER. Abstract approved: Ht49414' David D. My ld

  • 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:
    Input. Abstract approved: ______________________________________ David D. Myrold

  • 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:
    . Abstract aooroved: • • 7Elizabeth W. Sulzmarf/ Most carbon (C) transformations in soil are carried out

  • Contributions of ammonia-oxidizing bacteria and archaea to nitrification in forest soils

    Creator:
    Lu, Xinda
    Abstract:
    Prior to 2005, ammonia oxidation, the first step of nitrification, was thought mediated mainly by ammonia-oxidizing bacteria (AOB). However, the discovery of Thaumarchaeota carrying the genes coding for the ammonia monooxygenase (AMO) enzyme led to the discovery that ammonia-oxidizing archaea (AOA) also contribute to nitrification. Despite the uptick in studies...
    Resource Type:
    Masters Thesis
    Full Text:
    : _____________________________________________________________________ David D. Myrold Prior to 2005, ammonia oxidation, the first step of nitrification, was

  • 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:
    : _____________________________________________________ David D. Myrold Soil nitrogen exists largely as organic matter, including plant liter

  • 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:
    OF THE THESIS OF David D. Diaz for the degree of Master of Science in Soil Science presented on

  • Variation in communities of ammonia-oxidizing and denitrifying bacteria in Fennoscandian boreal forest soils

    Creator:
    Ghimire, Rama D.
    Abstract:
    The objective of this study was to examine the variation among ammonia-oxidizing and denitrifying communities in soils of a natural Fennoscandian boreal forest and of a forest with a long history of fertilization with different levels of nitrogen (N), and to examine whether there are any changes in the microbial...
    Resource Type:
    Masters Thesis
    Full Text:
    . Abstract approved: David D. Myrold The objective of this study was to examine the

  • 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:
    hours for the first 5 d, and Redacted for Privacy weekly thereafter. Destructive sampling took place

  • 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:
    :2919-2923. Benson, D. R., and W. B. Silvester (1993). Biology of Frankia strains, actinomycete