Abstract
The main research results of nitrous oxide (N 2O) emission from paddy fields in China were summarized. Paddy fields are an important source of N 2O emission. Denitrification process exists not only in the upper flooded cultivated layer in paddy fields but also in the underground saturated soil layer. The cropping system with rice–wheat rotation and the water regime with mid-season aeration (MSA) in paddy fields of China are not only the controlling factors of N 2O emission but also the main factors influencing methane (CH 4) emission. There is a trade-off relationship between N 2O and CH 4 emissions from paddy fields. Straw amendment reduced N 2O emission but promoted CH 4 emission. Therefore, effects of both CH 4 and N 2O emissions from rice fields on the global warming potential (GWP) should be taken into consideration when any mitigation options are to be established.
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