The invertase activity of soil under different years of continuous cropping .
不同连作年限土壤的转化酶活性。
The activity of soil urease , acidphosphotase and invertase weakened with increase of soil depth .
各林地土壤脲酶、酸酶和转化酶随着土壤剖面的加深，其活性减弱。
Microbial biomass had a decreasing trend with the increase of grazing intensity . Soil urease , catalase , invertase , and protease had a decreasing trend accompanied with the increase of grazing intensity .
