The effect on methane emission by different soil enzyme activity in paddy soil

In this study, with the paddy soil by different fertilized in Chengdu Plain, we have researched the correlation between soil cataloes, phosphates and unease activity and CH₄ emission. The results showed that: (1) in the rice growth period, the Soil cataloes, phosphates and unease activity for each treatment got the trend that decreasing first and then increasing, decreasing finally. The soil cataloes, phosphates and unease activity maximized at tailoring stage, heading stage next, followed by the jointing stage, maturity is the lowest. (2) CH₄ emission from paddy soil in each treatment was decreased in the whole rice growth period. From the tailoring to jointing stage CH₄ emission reduced much larger than the others. (3) We got a significant positive correlation between CH₄ emission and soil enzymatic activities in DM, T3 and T₄ treatments.