Upscaling Chamber-Based Measurements of N sub(2)O Emissions at Snowmelt

The emissions of nitrous oxide during snowmelt can be a major component of annual emissions, but the magnitude of emissions can differ significantly between years at a given site and among land uses and topographical positions. In this study, N sub(2)O emissions were measured in a small region near...

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Bibliographic Details
Published in:Canadian journal of soil science 2005-02, Vol.85 (1), p.113-113
Main Authors: Pennock, D, Farrell, R, Desjardins, R, Pattey, E, MacPherson, JI
Format: Article
Language:English
Subjects:
Pisum sativum
Triticum aestivum
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Summary:The emissions of nitrous oxide during snowmelt can be a major component of annual emissions, but the magnitude of emissions can differ significantly between years at a given site and among land uses and topographical positions. In this study, N sub(2)O emissions were measured in a small region near Laird, SK, Canada, during the 2002 snowmelt using small chamber measurements, and the spatial and temporal patterns of emissions were examined among sites grouped by a specific ecosystem-scale variable. The soils were dominantly Black Chernozemic soils, and the study fields had been planted to wheat, canola, field peas, or forages. Stratification of the sampling sites into crop type and manure use was found to be successful for assessing the agro-ecosystem-scale pattern in emissions. The observed low N sub(2)O emissions were attributed to the low water-filled pore space in the fall preceding the measurement period and/or to the low soil nitrate concentrations measured in the preceding fall.
ISSN:0008-4271