Integrated effect of decreasing CH_4 and N_2O emission by Biochar incorported to paddy field on late rice

The field experiment of CH4 and N2O emission by straw incorporated to paddy field(RS) and biochar incorporated to paddy field(BC) during late rice growth stages was studied in Hunan province using the static chamber-gas chromatograph techniques.Results showed that Amount of CH4 emissions by treatments of RS and BC were increased by 24.70%(P0.05) and 6.32% respectively,compared with chemical fertilization treatment(CF),but amount of N2O emission was reduced by 37.08%(P0.05) and 37.61%(P0.05),respectively.Amount of CH4 emissions by BC treatment was decrease by 14.74%(P0.05) than that of RS treatment.According to Global Warming Potential(GWP) converted by CH4 and N2O emissions at one hundred years scale,the result showed that GWP of unit yields arranged by RS CK BC CF.Therefore,biochar returned to field not only was stabilized rice yields,but also reduced CH4 and N2O emission of later rice,and application of BC has a well environment benefits.