外源纤维素酶对秸秆降解速率及土壤速效养分的影响

Influences of outer cellulose on degradation rates of straws and available nutrients of soil

为探求促进秸秆降解的新途径，采用室内培养法研究了外源纤维素酶对秸秆降解速率及土壤速效养分的影响。结果表明，整个培养期内，小麦秸秆、玉米秸秆加酶处理与不加酶处理降解率都存在极显著差异（P〈0．01），到培养结束时小麦秸秆加酶处理降解率高出不加酶处理7．10％～11．86％，玉米秸秆高出8．01％～14．04％；整个培养期内，小麦秸秆、玉米秸秆加酶处理与不加酶处理间土壤碱解氮、速效磷、钾含量都存在极显著差异（P〈0．01），培养结束时，小麦秸秆最优处理碱解氮、速效磷、钾含量分别高出对照4．15，3．60，32．35mg／kg，玉米秸秆分别高出6．50，4．27，47．97mg／kg。结果说明添加外源纤维素酶能够提高秸秆降解速率，促进秸秆养分矿化。

In order to find the new way to promote the degradation rates of crop straws, the influences of outer cellulose on degradation rates of straws and available nutrients of soil were investigated by incubation experiments. When the incubation finished, the degradation rate of wheat straw added cellulose were increased 7.10% -11.86%, and the rate of corn straw were increased 8.01% ~ 14.04%. Compared with the CK, the contents of soil available N, available P and available K for the optimal Tr of wheat straw were increased 4.15, 3.60, 32.35 mg/kg, and for the Tr of corn straw were increased 6.50, 4.27, 47.97 mg/kg respectively when the incubation finished.