秸秆还田与全膜双垄集雨沟播耦合技术对玉米产量、土壤有机碳库及微生物特性的影响

In this paper, in order to improve soil fertility and crop yeild, we coupled straw and double ridges and furrows with plastic mulch to make full use of the advantages of both technologies. This study aimed at discussing the effect of both the tecnologies on maize yeild, soil organic carbon pool and microbial properties. Results showed that both of the straw (S) and plastic mulch (M) improved maize yeild. Compared to CK treatment, we found S, M and S+M treatments improved maize yeild by 15.4%, 105.0% and 136.1% respectively in 2009, and by 5.9%, 88.8% and 93.0% respectively in 2010. Straw returning to field increased all of the soil organic carbon, partical organic carbon and light organic carbon, but plastic mulching decreased the content of their, and the trend of their content among treatments was S > S+M > CK > M. Both of the straw and plastic mulch increased all of the microbial biomass carbon, ?-glucosidase, alkaline phosphatase and urease, and the content of their in S+M treatment was significantly higher than that of CK. Correlation analysis showed three enzymes were highly positive correlated with microbial biomass carbon.