地下水位与有机肥及水分管理对稻田甲烷排放的影响

Effects of Groundwater Level,Organic Manuer and Water Regime on Methane Emission from Rice Fields

采用长期定位模拟试验研究了地下水位、有机肥、水分管理对稻田甲烷排放的影响 .结果表明 ,不同有机肥用量条件下 ,早稻高量绿肥低水位处理稻田甲烷排放速率高于常量绿肥低水位处理 ,晚稻则相反 ;不同地下水位条件下 ,早稻高量绿肥低水位处理稻田甲烷排放速率高于高量绿肥高水位处理 ,晚稻相反 ;但是间歇排灌处理无论是排放速率还是排放总量都大大低于正常灌溉处理 ,且在所有处理中也是最低的 .可见 。

The effects of groundwater level, water regime and organic manure on methane emission were studied from imitation field with collector boxes. The results show that methane emission rate from larger quantity of green manure plot(HHS 2) is higher than that from normal quantity of green manure plot(HMS 1) during early rice vegetation period, while to late rice, the order is HMS 1>HHS 2. The methane emission rate from low water level plot(HHS 2) is higher than that from high water level plot(HHS 1) during early rice vegetation period, while to late rice, the order is HHS 1>HHS 2. The methane emission rate from wetting and drying cycle plot is much lower than that from normal irrigation plot during the whole rice season, and it is at the lowest level in the four treatments. The results indicate that the improved water management is an effective method to mitigat CH 4 emission from rice fields.