Perennial legume phase and annual crop rotation influences on CO2 and N2O fluxes over two years in the Red River Valley, Manitoba, Canada

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dc.contributor.supervisor Tenuta, Mario (Soil Science) en
dc.contributor.author Stewart, Siobhan Elaine
dc.date.accessioned 2011-01-18T21:52:25Z
dc.date.available 2011-01-18T21:52:25Z
dc.date.issued 2011-01-18T21:52:25Z
dc.identifier.uri http://hdl.handle.net/1993/4366
dc.description.abstract Studies have shown that including perennial forages in cropping rotations can increase soil carbon (C) and lower nitrous oxide (N2O) emissions when compared to continuous annual cropping. Research is needed to evaluate the inclusion of a perennial forage in an annual crop rotation on net carbon dioxide (CO2) and N2O fluxes, natural and agronomic drivers of seasonal greenhouse gases (GHGs), and the possibility of using forages as a C sequestration-CO2 mitigation tool. A long-term field experiment site to determine GHG budgets for Red River Valley cropping systems in Manitoba, Canada was used. The site consisted of four plots with the same annual rotation management history. A perennial legume, alfalfa, was grown in 2008 and 2009 on two plots and spring wheat and industrial oilseed-rapeseed grown on the other two plots in 2008 and 2009, respectively. Nitrous oxide and CO2 fluxes were measured continuously using the flux gradient micrometeorological method. For the net study period, the perennial phase sequestered twice the atmospheric CO2 (2070 kg C ha-1) compared to the annual crops. The annual rotation emitted 3.5 times more N2O than the perennial legume phase. When accounting for harvest C removals and considering GHGs in CO2-equivalent (eq.), the perennial legume phase was a net sink of 5440 kg CO2-eq. ha-1 and the annual rotation was a net source of 4500 kg CO2-eq. ha-1 for the two year study period. Information gathered will help bridge missing data gaps in national emission trends and enhance development of Canadian GHG mitigation models. en
dc.format.extent 1250052 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.subject perennial legume forage en
dc.subject wheat en
dc.subject rapeseed en
dc.subject flux gradient method en
dc.subject CO2 en
dc.subject N2O en
dc.title Perennial legume phase and annual crop rotation influences on CO2 and N2O fluxes over two years in the Red River Valley, Manitoba, Canada en
dc.degree.discipline Soil Science en
dc.contributor.examiningcommittee Amiro, Brian (Soil Science) Entz, Martin (Plant Science) en
dc.degree.level Master of Science (M.Sc.) en
dc.description.note February 2011 en

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