Denitrification in a Tallgrass Prairie Landscape
We characterized factors controlling denitrification and quantified rates of N gas production by this process in a tallgrass prairie landscape in central Kansas. The experimental design included three land use classes (unburned, annually burned, and annually burned and grazed) in factorial combination with three slope positions (summit, back-slope, toe-slope), plus a cultivated site in a toe-slope position (10 sites total). Denitrification was measured using an acetylene-based soil core technique four times in 1987, once in early 1988, and six times in 1989. Cores were incubated under field-moist conditions and after amendment with water or water plus nitrate. Microbial biomass and nitrification and dentrification enzyme activities were also measured. Denitrification was higher (P
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