Nitrous Oxide Emission and Abundance of N-cycling Microorganisms in Corn-based Biofuel Cropping Systems

dc.contributor.advisorDunfield, Kari E.
dc.contributor.advisorWagner-Riddle, Claudia
dc.contributor.authorNémeth, Deanna Deaville
dc.date.accessioned2012-05-30T14:27:56Z
dc.date.available2012-05-30T14:27:56Z
dc.date.copyright2012-04
dc.date.created2012-04-18
dc.date.issued2012-05-30
dc.degree.departmentFaculty of Environmental Sciencesen_US
dc.degree.grantorUniversity of Guelphen_US
dc.degree.nameMaster of Scienceen_US
dc.degree.programmeLand Resource Scienceen_US
dc.description.abstractAgriculture management including tillage and crop residues impact the functioning of soil microbiota. Soil microbiota cycle nutrients, with greenhouse gases being a byproduct within the cycle. The main objectives of this thesis were to 1) assess tillage and corn residue impact on N-cycling soil microorganisms and N2O emissions in situ (Chapter 3); and 2) evaluate N-cycling soil microorganisms in situ relative to N2O flux during a spring thaw cycle (Chapter 4). In situ sampling addresses how changing field conditions influence soil bacterial processes. Results indicated tillage and removal of corn residue declined soil microbial abundance and increased N2O emissions. These responses were dependent on local environmental conditions; moisture, carbon and nitrogen availability. The spring thaw study highlighted N-cycling microorganisms were present and active over the spring thaw event, and delayed nosZ denitrifier activity was related to the timing of significant N2O emission events, suggesting new evidence of de novo denitrification.en_US
dc.description.sponsorshipOntario Ministry of Agriculture, Food and Rural Affairs
dc.description.sponsorshipNatural Science and Engineering Research Council
dc.identifier.urihttp://hdl.handle.net/10214/3693
dc.language.isoenen_US
dc.publisherUniversity of Guelphen_US
dc.rightsAttribution-ShareAlike 2.5 Canada*
dc.rights.urihttp://creativecommons.org/licenses/by-sa/2.5/ca/*
dc.subjectdenitrificationen_US
dc.subjectnitrificationen_US
dc.subjectcrop residuesen_US
dc.subjectN2O emissionen_US
dc.subjectsoil microorganismsen_US
dc.titleNitrous Oxide Emission and Abundance of N-cycling Microorganisms in Corn-based Biofuel Cropping Systemsen_US
dc.typeThesisen_US

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