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稻田土壤Ｅｈ值＜－１５０ｍＶ时甲烷大量产生，甲烷排放速率随着温度的上升而加大，与稻田水层温度的相关系数ｒ＝０．９６１１＊＊，水稻整个大田生长期的甲烷平均排放通量为１８２．１８ｍｇ·ｍ－２·ｄ－１。通过控水晒田可迅速提高土壤Ｅｈ值，使土壤水溶解的甲烷量和排放量骤然下降，其下降幅度在９０％以上。稻田耕层土壤水溶解的甲烷量，随土层深度增加而逐渐上升，土层为５ｃｍ、１０ｃｍ和１５ｃｍ的溶解甲烷量，分别为０．４６、１．８３、２．２４和３．１３μｇ·ｍｌ－１。较低的Ｃ％和Ｎ％水稻土，其甲烷产生和释放的潜力较弱。
Methane was produced in a large amount when paddy soil Eh <-150mV. The methane emission rate increased with the increase of temperature, and the correlation coefficient r = 0.9611 ** with rice paddy water temperature. The average methane emission of paddy field during the growing season The amount was 182.18 mg · m-2 · d-1. By controlling the water sunning field can quickly increase the soil Eh value, the amount of methane dissolved in water and emissions of soil suddenly dropped, the decline of more than 90%. The amount of methane dissolved in the topsoil of paddy soil gradually increased with the depth of the soil layer, and the amount of dissolved methane of 5cm, 10cm and 15cm soil layers were 0.46, 1.83, 2.24 and 3.13μg · ml-1. Lower C% and N% paddy soils have weaker potential for methane production and release.