To study effects of different restored vegetations on soil microbial community activities in a degraded ecological system

and probe into the sensitive and reliable indicating index for revealing suitable vegetations in local ecological conditions.The results showed that soil microbial biomass C

N

P and soil microbial quotient

soil enzymes such as sucrase

urease

catalase and alkaline phosphatase were significantly different(P<0.05) in the restored Agriophyllum squarrosum

Artemisia sphaerocephala kasch

Caragana korshinskii

Ammopiptanthus mongolicus and artificial arbor(Pinaceae sylvestris L.Var.mongolicus Litv.mixed with Robinia pseudoacacia L.) stands.In soil profile

soil microbial biomass C

P and N in Caragana korshinskii stand were relatively high except for soil microbial biomass N at upper soil layer in artificial arbor stand

and they were low in Agriophyllum squarrosum stand;soil microbial quotient didn't have obvious trend in the restored vegetations stands.Activities of sucrase in artificial arbor stand and urease in Caragana korshinskii stand were relatively high

the activities of catalase and alkaline phosphatase also didn't have regular trends

and the activities of sucrase

urease and catalase were relatively low in Agriophyllum squarrosum stand and so was the activity of alkaline phosphatase in Artemisia sphaerocephala kasch stand.Analysis of variance(ANOVA) explained that the relations between tested soil enzymes

soil organic matter and soil total N and soil microbial biomass C

N

P was closely correlated

principal component analysis indicated that soil microbial biomass C

N

P

sucrase and soil microbial quotient expressed the main information on the response of soil microbial community activities to the restored vegetation in studied area.From the changes of soil microbial community activites in the restored vegetation stands it is indicated that Caragana korshinskii and artificial arbor are suitable vegetation restoration types to local ecological conditions.