Quantifying denitrification on a field-scale in hummocky terrain
Date
1989-02-16
Authors
Elliott, J.A.
de Jong, E.
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Abstract
Down-slope and cross-slope curvature and elevation were used to identify nine landscape elements for a slough-focused basin in hummocky terrain near Hafford, Saskatchewan. Denitrification was measured at monthly intervals from April to October in 1986, 1987, and 1988. The measured values were interpolated to daily values using a simple soil moisture budget and a regression model relating denitrification to moisture
content and air temperature. The model predicted denitrification well except in 1987, the fallow year, when the denitrification flush due to substrate availability was underestimated. Annual denitrification was higher in 1987 than in either 1986 or 1988 when wheat and canola, respectively, were grown. Low-lying and convergent elements had greater denitrification than diverging elements or those higher in the landscape. The relative abundance of the landscape elements was used to extend the denitrification predicted for the landscape elements to the whole field.
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Soils and Crops Workshop