土壤性质和非水稻生长期土壤水分对CH4 产生、氧化和排放的影响

土壤有机质含量是影响CH4产生的最重要土壤性质 .土壤CH4氧化能力与包括活性碳、有机碳和全氮含量在内的土壤理化性质之间都不存在显著相关性 .非水稻生长期较高的水分含量能促进水稻生长季节CH4的产生、氧化和排放 .在影响稻田CH4排放大尺度空间变异性的主要因素中 ,土壤水分历史可能比土壤性质更为重要 .结果表明 ,非水稻生长期土壤水分对水稻生长期CH4产生、氧化和排放具有极其重要的控制和调节作用

Soil Moisture During the Non-Rice Growing Season and Soil Properties Affect CH4 Production, Oxidation and Emission

Soil organic matter content is the most important property to affect CH 4 production. There is no specific soil property to affect significantly CH 4 oxidation. The CH 4 production, oxidation and emission potentials are all stimulated by higher soil water content during the previous non rice growing season. Soil water history might be a more important factor than soil property in controlling the spatial variability of CH 4 emissions from rice fields on large spatial scale. The results demonstrate the importance of water management between rice crops as a means to regulate CH 4 production,oxidation and emission during rice growing season.