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Nitrous Oxide Emissions from Agricultural Toposequences in Alberta and Saskatchewan

^a Joint Global Change Research Institute, Univ. of Maryland, 8400 Baltimore Ave., Suite 201, College Park, MD 20740-2496
^b Agriculture and Agri-Food Canada, Semiarid Prairie Agricultural Research Centre, P.O. Box 1030, Airport Road, Swift Current, SK S9H 3X2, Canada
^c Alberta Agriculture, Food and Rural Development, 206 J.G. O'Donoghue Bldg., 7000 113 St., Edmonton, AB T6H 5T6, Canada

View larger version (18K): [in a new window]   Fig. 1. Nitrous oxide fluxes at Mundare, AB, from four landscape positions during the spring thaw period of 1996. Also shown are average air temperatures during the measurement periods and, with black arrows, days with significant precipitation 5 mm.

View larger version (17K): [in a new window]   Fig. 2. Relationship between N2O flux (g NO2–N ha–1) and water-filled pore space (m3 m–3) at Swift Current during the summer of 1999.