Soil microbial biomass and soil enzyme activities are key indicators of soil function and indicators of soil recovery and environmental changes. The dynamic patterns of soil microbial biomass carbon and nitrogen and soil enzyme activities in different soil layers (0-5, 5-10 and 10-20 cm) at revegetated areas in the southeastern fringe of the Tengger Desert, respectively, were investigated by taking moving sand dune as control. The results showed that:The soil microbial biomass carbon, microbial biomass nitrogen, urease, polyphenol oxidase, alkaline phosphatase, catalase, amylase, cellulase and sucrase all increased with the increasing restoration age, and decreased with the increasing soil depth, significant differences were found among different revegetated areas and different soil layers (P<0.05). And 0-5 cm soil layer changes most obviously. After 62-year-revegetation,the soil microbial biomass carbon, microbial biomass nitrogen, urease, polyphenol oxidase, alkaline phosphatase, catalase, amylase, cellulase and sucrase increased by 16.44, 8.79, 3.99, 3.01, 2.54, 19.35, 0.77, 0.65 and 16.61 times,and their average annual rate of change is 1.55, 0.21 mg·kg-1 and 6.14×10-4, 1.25×10-2, 9.32×10-4, 6.05×10-2, 8.22×10-5, 9.07×10-5, 4.24×10-3 mg·g-1·h-1 respectively. The soil microbial biomass carbon and nitrogen and soil enzyme activities were highly positive correlated with silt and clay content, pH, electronic conductivity, the concentrations of organic carbon, inorganic carbon, total nitrogen, available nitrogen, available phosphorus and available potassium, while negatively correlated with sand and bulk density. The results showed that planting xerophytic shrubs can effectively promote the restoration of sandy soil function and improve the environment in the sandy area.
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