N2O emissions from agricultural soils in the North China Plain:the effect of chemical nitrogen fertilizer and organic manure

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N2O emissions from agricultural soils in the North China Plain:the effect of chemical nitrogen fertilizer and organic manure

An enclosed chamber technique was used to measure N2O emissions from intensively agricultural soils of the North China Plain during the periods of 1995-1996 and 1997-1998, to reflect distinct components of winter wheat and summer maize growing seasons. The results showed that the continuous application of fertilizer in agricultural soils increased N2O emissions by a factor of 24. 1-28.1, the calculated annual chemical N fertilizer-transformed N2O-N emissions was 0.67%. Our results indicated that the application of organic manure also had a significant influence on soil N2O emissions, which combined with the use of chemical N increased about 20% in a year. It was calculated that there were about 0.11% N of organic manure transformed as N2O-N. Annual mean N2O emission from our study area of fertilized soils was estimated to be 57.1 μgN2O/(m2 ＠ h). A weak correlation was also found between. N2O emissions and soil available nitrogen content NH+4 .