水分管理影响稻田甲烷排放研究进展

Water Regime Management Affects Methane Emission from Rice Paddy Field:A Review

水分管理是影响稻田甲烷(CH4)产生、氧化与排放的重要因素之一。根据国内外文献资料,综述了非水稻生长期和水稻生长期水分管理对稻田CH4产生排放的影响,以及非水稻生长期水分管理对水稻生长期CH4产生排放的影响,并提出有待研究的内容。综合多年的研究结果表明,冬季淹水不仅引起冬季(非水稻生长期)CH4的大量排放,还影响水稻生长期CH4排放量。非水稻生长期土壤水分含量越高,随后水稻生长期CH4排放量越大,产生和氧化能力越强。水稻生长期烤田相对于持续淹水能大量减少CH4排放。

Water regime management is one of the factors affecting methane（CH4）generation, oxidation, and emission of rice paddy fields. Flooding of the paddy field in winter causes high CH4 emission not only during the non-rice growing season, i. e. winter, but also during the rice growing season to follow. The higher the soil moisture content in the non-rice growing season, the higher CH4 emission, and the stronger CH4 production and oxidation capacities of the soil during the rice growing season. The effect of water regime management during the non- rice growing season on CH4 emission during rice growth season was attributed to water content affecting methanotroph and methanogenesis. Drying rice paddy fields in sunshine or plantation of wheat in winter could profoundly reduce CH4 emission from long flooded paddy fields. Also, CH4 emission could be sharply decreased by midseason aeration during rice growing period. In this paper a review is presented to sum- marize the effect of water regime management during the non-rice and rice growing seasons on CH4 emission from the soils and the effect of water regime management during the non-rice growing season on CH4 emission during the rice growing season, and issues that need further studying are also put forward.