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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

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:: privacy ACKNOWLEDGMENTS First of all, I would like to express my special appreciation to Dr. David

Nitrogen fixation and cycling in a mixture of young red alder and Douglas-fir

Creator:: Tang, James Y.
Resource Type:: Masters Thesis
Full Text:: a Mixture of Young Red Alder and Douglas-fir Abstract approved: David D. Myrold Red alder (Alnus

Ammonia-oxidizer and denitrifier populations in boreal forest soils of differing nitrogen availability

Creator:: Burton, Marci S.
Abstract:: Nitrification and denitrification are major biological processes transforming nitrogen (N) in soils to plant available N, highly leachable nitrate (NO₃⁻) and gaseous N oxides. Although many studies in the past have studied N cycling communities, the effect of increased N inputs on ammonia-oxidizer and denitrifier population dynamics is still under...
Resource Type:: Masters Thesis
Full Text:: Abstract approved: David D. Myrold Nitrification and denitrification are major biological

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:: advisors, David Myrold and Peter Bottomley, and Mark Williams for helping me grow into myself as a

Using Algal Biomass as a Fertilizer

Creator:: Cappellazzi, Shannon B.
Abstract:: Algae can be used in a variety of wastewater systems to capture nutrients while fixing carbon dioxide from the atmosphere. I conducted field trials at three locations in Oregon with both corn and potato crops to assess the agronomic value and environmental impact of using the resulting algal biomass as...
Resource Type:: Dissertation
Full Text:: : ______________________________________________________ David D. Myrold Algae can be used in a variety of wastewater systems to capture

ScholarsArchive@OSU

Nitrogen dynamics in red alder

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

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

Litter controls of microbial community composition and function in forest soils

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

Evolution and ecology of the Ceanothus-Frankia symbiosis

Nitrogen fixation and cycling in a mixture of young red alder and Douglas-fir

Ammonia-oxidizer and denitrifier populations in boreal forest soils of differing nitrogen availability

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

Using Algal Biomass as a Fertilizer

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