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Burning and cultivation effects on greenhouse gas emissions and nutrients in wetland soils from Saskatchewan, Canada
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Burning and cultivation effects on greenhouse gas emissions and nutrients in wetland soils from Saskatchewan, Canada
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Journal Article
Burning and cultivation effects on greenhouse gas emissions and nutrients in wetland soils from Saskatchewan, Canada
2007
Overview
Wetland fringe areas in prairie agricultural landscapes may be subjected to burning of vegetation in autumn followed by cultivation in spring. The objective of this study was to examine the greenhouse gas (CO₂, N₂O and CH₄) emissions and plant nutrient (NO₃, PO₄ and SO₄) supplies in wetland fringe soils as affected by simulated burning + cultivation, at field capacity and saturation moisture content. Using undisturbed soil cores collected from grassed wetland fringes at four sites in southern Saskatchewan, the impacts were examined over a 20-day period. The burning + cultivation treatment generally reduced CO₂ emissions, tended to increase NO₃-N availability, and had no consistent effect on N₂O emissions, or PO₄-P and SO₄-S supply. Production of CH₄ occurred only at one site, and only under saturated conditions. Compared to field capacity, saturation reduced CO₂ emissions and NO₃-N supply, tended to increase PO₄-P availability, and had no consistent effect on N₂O emissions and SO₄-S. The CO₂ emissions and SO₄-S were greater for soil cores with higher organic matter and salinity, respectively. The N₂O emissions were only occasionally related to soil NO₃-N supply rate.
