Abstract:
The advanced research achievements in the processes of N
2O production and emission,their influencing factors and measurement methods and estimation for total N
2O emision are studied in this paper.The results show that N
2O can be produced by nitrification and denitrification.The soil moisture,soil temperature,pH,soil organic carbon content and soil texture are the main factors that influence N
2O production and emision.According to the measured N
20 fluxes and some related models,the total N
2O emission from cropland in China is N 398Gg/a,accounting for 10%of the total emlssion from agricultural soil in the world.And N
2O emissions are N 310Gg/a and 88Gg/a from upland and paddy fields,respectively.