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

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dc.contributor.advisor Dunfield, Kari E.
dc.contributor.advisor Wagner-Riddle, Claudia Németh, Deanna Deaville 2012-04-18 2012-05-30T14:27:56Z 2012-05-30T14:27:56Z 2012-05-30
dc.description.abstract Agriculture 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.sponsorship Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) and Natural Science and Engineering Research Council (NSERC) en_US
dc.language.iso en en_US
dc.rights.uri *
dc.subject denitrification; nitrification; crop residues; N2O emission; soil microorganisms en_US
dc.title Nitrous Oxide Emission and Abundance of N-cycling Microorganisms in Corn-based Biofuel Cropping Systems en_US
dc.type Thesis en_US Land Resource Science en_US Master of Science en_US Faculty of Environmental Sciences en_US

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