关键词: 甲烷；排放；减排；杂交稻；沼渣；层次分析法

Abstract: Based on the experiments and research on the generation and emission factors of methane carried out for several years, 3 promising methods for mitigation of methane emission from rice field were found. The effectiveness and economic benefits of each method for mitigation of methane emission from rice field were analyzed by using cost benefit analysis method AHP. At present, the major methods are using biogas pit residue to substitute fresh organic fertilizers, rice cultivar selection, and water regime. Using biogas pit residue to substitute fresh organic fertilizers and using the hybrid rice insted of conventional rice cultivars are suitable to China. The first method can mitigate methane emission significantly, and it’s social and environmental benefits are better than the second one. But the economic benefit of the second one is prominent.

Key words: Methane, Methane, Emission, Mitigation, Hybrid rice, Biogas pit residues, AHP