Applying rice straw just before soil is flooded for rice transplanting (DFL) significantly enhanced CH4 flux by 3.04 times in 1996 and 7.12 times in 1997 compared with rice straw application just before the previous crop season (DFE).

• 与前茬季节前施用稻草(稻草早)相比；水稻移栽前施用稻草(稻草晚)的处理CH4排放量增加了3.；04(1996年)和7