Effect of nitrification inhibitor and aeration regulation on soil N2O emission

Laboratory incubation experiments were carried out to investigate effects of soil moisture and temperature on(nitrification) rate and N2O emission,and effects of nitrification inhibitor(N-Serve) incorporated with sand on N2O emission.The rate of nitrification was increased with the rising of soil temperature,with the highest rate at 30 ℃;soil moisture didn't affect the rate of nitrification significantly.N2O emission is increased with the rising of soil temperature and moisture.The highest N2O emission occurred at soil moisture being 28.5% and soil temperature being 20℃ or 30 ℃.At 30 ℃,N2O production was quite low under moisture stress(14.2%) with a cumulative N2O emission being 126.4 (mg/kg),which was primarily from nitrification;cumulative N2O emission was decreased by 65.0% when 80mg/kg N-Serve was added.Cumulative N2O emission increased rapidly with the cumulative emission being 764.4 mg/kg when soil moisture increased to 28.5% under which denitrification occured;however,it was decreased by 82.9% and 62.1%,(respectively) when mixing sand at a ratio of 1∶1 or adding N-Serve.We could conclude that applying N-Serve could(inhibit) nitrification at low soil moisture,while at the high soil moisture,applying sand or combine applying sand with N-serve could inhibit N2O emission efficiently.