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dc.contributor.supervisor Tenuta, Mario (Soil Science) Amiro, Brian (Soil Science) en
dc.contributor.author Glenn, Aaron James
dc.date.accessioned 2010-10-26T20:11:22Z
dc.date.available 2010-10-26T20:11:22Z
dc.date.issued 2010-10-26T20:11:22Z
dc.identifier.citation Glenn A.J., Amiro B.D, Tenuta M., Stewart S.E., and Wagner-Riddle C. 2010. Carbon dioxide exchange in a northern prairie cropping system over three years. Agricultural and Forest Meteorology 150: 908 – 918. en
dc.identifier.uri http://hdl.handle.net/1993/4286
dc.description.abstract Agriculture contributes significantly to national and global greenhouse gas (GHG) inventories but there is considerable control over management decisions and changes in production methods could lead to a significant reduction and possible mitigation of emissions from the sector. For example, conservation tillage practices have been suggested as a method of sequestering atmospheric carbon dioxide (CO2), however, many questions remain unanswered regarding the short-term efficacy of the production method and knowledge gaps exist regarding possible interactions with essential nutrient cycles, and the production of non-CO2 GHGs, such as nitrous oxide (N2O). Between autumn 2005 and 2009, a micrometeorological flux system was used to determine net CO2 and N2O exchange from an annual cropping system situated on clay soil in the Red River Valley of southern Manitoba. Four plots (4-ha each) were independently evaluated and planted to corn in 2006 and faba bean in 2007; in 2008, two spring wheat plots were monitored. As well, during the non-growing season in 2006-2007 following corn harvest, a second micrometeorological flux system capable of simultaneously measuring stable C isotopologue (12CO2 and 13CO2) fluxes was operated at the site. Tillage intensity and crop management practices were examined for their influence on GHG emissions. Significant inter-annual variability in CO2 and N2O fluxes as a function of crop and related management activities was observed. Tillage intensity did not affect GHG emissions from the site. After accounting for harvest removals, the net ecosystem C budgets were 510 (source), 3140 (source) and -480 (sink) kg C/ha/year for the three respective crop years, summing to a three-year loss of 3170 kg C/ha. Stable C isotope flux measurements during the non-growing season following corn harvest indicated that approximately 70 % and 20 – 30 % of the total respiration flux originated from crop residue C during the fall of 2006 and spring of 2007, respectively. The N2O emissions at the site further exacerbated the net global warming potential of this annual agroecosystem. en
dc.format.extent 6636946 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.rights info:eu-repo/semantics/openAccess
dc.subject agrometeorology en
dc.subject agroecology en
dc.subject greenhouse gas budget en
dc.subject net ecosystem exchange en
dc.subject nitrous oxide en
dc.subject stable C isotopes en
dc.title Greenhouse gas fluxes and budget for an annual cropping system in the Red River Valley, Manitoba, Canada en
dc.type info:eu-repo/semantics/doctoralThesis
dc.degree.discipline Soil Science en
dc.contributor.examiningcommittee Lobb, David (Soil Science) Papakyriakou, Tim (Environment and Geography) Griffis, Timothy (University of Minnesota-Twin Cities) en
dc.degree.level Doctor of Philosophy (Ph.D.) en
dc.description.note February 2011 en


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