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In this study, we investigated the greenhouse gas emission under different application of biochar in the conditions of continuous flooding and water-saving irrigation in paddy fields, whereas, plant and soil carbon sequestration were considered in the calculation of net greenhouse gas emissions. The emission rates of methane (CH 4 ), carbon dioxide (CO 2 ), and nitrous oxide (N 2 O) gases were simultaneously monitored once every 7-10 days using the closed-chamber method. As a whole, the net greenhouse gas emission in the water-saving irrigation was more than that of the continuous flooding irrigation conditions. Compared with the water-saving irrigation, the continuous flooding irrigation significantly increased the CH 4 in the control (CK) and chemical fertilizer treatments (NPK). The CO 2 emissions increased in each treatment of the water-saving irrigation condition, especially in the chemical fertilizer treatments (NPK FW ). Similarly, the soil N 2 O emission was very sensitive to the water-saving irrigation condition. An interesting finding is that the biochar application in soils cut down the soil N 2 O emission more significantly than NPK FW in the water-saving irrigation condition while the effect of biochar increased under the continuous flooding irrigation condition.

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