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在西南农业大学和华南农业大学农场的田间试验表明 ,长期淹水是我国西南地区冬灌田水稻生长期CH4排放通量高于一般水田的主要原因 .土壤淹水前连续干燥的时间越长 ,水稻生长期CH4排放通量越低 ,但这种作用仅能维持一季水稻生长期 .冬灌田冬季排干 ,种植冬小麦 ,次年水稻生长期CH4平均排放通量可减少 63～ 72 % .如果我国西南地区冬灌田的水利设施能够得到有效改善 ,改冬灌为冬排 ,一年一季水稻为一水一旱 ,将可提高该类土壤生产力和大大减少我国稻田CH4排放总量 .
Field experiments in Southwest Agricultural University and South China Agricultural University farm showed that long-term flooding was the main reason for higher CH4 flux in paddy rice growing season than in paddy fields in southwest China. The longer the continuous drying time before flooding, The lower the flux of CH4 in growth period, but this effect can only maintain one season of rice growth.Water irrigation winter winter drafts, planting winter wheat, next year rice growth period average emissions of CH4 can be reduced by 63 ~ 72% .If the Southwest China The water conservancy facilities in the winter irrigation fields in the area can be effectively improved. The winter irrigation can be changed to the winter row. The rice is a water-drought in a year, which will increase the soil productivity and greatly reduce the total CH4 emissions in paddy fields in China.