Effects of Different Plants on Soil Microbial Biomass and Enzyme Activities in Zhifanggou Watershed of Loess Plateau

To reveal the effects of different vegetation types of Zhifanggou watershed on soil microbial biomass and soil enzyme activities,we studied the microbial biomass,soil enzyme activities and the correlation between soil physicochemical factors and mentioned parameters,taking nine vegetations of this valley as the materials.The results showed that:(1)Compared with the abandoned land,soil physiochemical properties,microbial biomass and enzyme activities of arbor and shrub increased;the available nitrogen,microbial biomass P,soil urease activity and catalase activity of herbaceous decreased.(2)Soil microbial biomass C,microbial biomass N,invertase activity and alkaline phosphatase activity of different vegetation types were consistent with the law of shrubarborherbaceous,while the microbial biomass P,urease activity and catalase activity were consistent with the law of arborshrubherbaceous.(3)The soil microbial biomass C,N and P were significant positively correlated with soil organic material,total nitrogen and total phosphorus,and there were significant positive correlations between enzyme activities and soil organic material,total nitrogen and alkali-hydrolyzed nitrogen.It indicated that soil microbial biomass and enzyme activities were influenced by vegetation types and soil physicochemical properties collectively,and the artificial shrub had a better effect on plant recovering than those of artificial arbor and herbaceous.