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Effects of Oxygen on Denitrification Inhibition, Repression, and Derepression in Soil Columns

^a Dep. of Chemistry and Biochemistry, Univ. of Windsor, Windsor, ON, Canada N9B 3P4
^b Greenhouse and Processing Crops Research Centre, Agriculture and Agri-Food Canada, Harrow, ON, Canada N0R 1G0

View larger version (17K): [in a new window]   Fig. 1. (a) Net rates of NO and N2O production under anaerobic (0.5–27 h), partially aerobic (27–51 h), and restored anaerobic (51–72 h) conditions. Error bars indicate standard errors , and those not shown were smaller than the symbols. (b) Net rates of NO and N2O production in the anaerobic reference column that was maintained under anaerobic conditions for the entire 72 h

View larger version (21K): [in a new window]   Fig. 2. Net rates of production of NO after addition of O2 relative to their respective anaerobic rates from 27 to 33 h. Error bars indicate standard errors , and those not shown were smaller than the symbols

View larger version (16K): [in a new window]   Fig. 3. Effect of O2 on net rates of NO and N2O production expressed as a percentage of the anaerobic rates. Rates were measured 5 min after addition of O2. Error bars indicate standard errors , and those not shown were smaller than the symbols

View larger version (14K): [in a new window]   Fig. 4. Rate of repression of NO and N2O production as a function of added O2. Note that the more negative the slope of production rates presented in Fig. 2, the greater is the repression rate. Error bars indicate standard errors , and those not shown were smaller than the symbols

View larger version (20K): [in a new window]   Fig. 5. Net rates of NO production in soil relative to the 51-h anaerobic rate following restoration of anoxic conditions. Error bars indicate standard errors , and those not shown were smaller than the symbols

View larger version (16K): [in a new window]   Fig. 6. Net rates of NO and N2O production 5 min after restoration of anaerobic conditions at 51 h (expressed as a percentage of their respective reference anaerobic rates at 51 h) vs. percentage O2 added. Error bars indicate standard errors , and those not shown were smaller than the symbols