[Objective] The relationship between salinification and alkaline of topsoil and vegetation cover was analyzed to provide scientific basis for the prevention and control of soil secondary salinization in this area.[Methods] Plant height

aboveground biomass of glycyrrhiza community and soil moisture

pH value

salt content in soil surface(0-5 cm) were measured. The relationships between indexes of vegetation characteristics and physical and chemical indexes of topsoil through measuring vegetation coverage were analyzed.[Results] With the extension of growing years

the vegetation coverage

plant height and aboveground biomass of Glycyrrhiza uralensis appeared an increasing trend. On the contrary

salt content and pH value of topsoil indicated a decreasing trend. Correlation analysis displayed

there was a negative relation between soil salt content and pH value of topsoil and all indexes of vegetation characteristics. Correlation coefficients ranked as vegetation coverage > plant height > aboveground biomass. Regression analysis indicated

salt content and pH value of topsoil and indexes of vegetation characteristics all showed a negative linear relation. When coverage

height and aboveground biomass of Glycyrrhiza uralensis vegetation each increased one unit

pH values of topsoil decreased 0.012

0.011 and 0.002

salt content of topsoil decreased 0.108

0.107 and 0.015 g/kg.[Conclusion] Vegetation significantly influenced salt content and pH value of topsoil. The most influence index is vegetation. When only considering the restraining of soil salt

those crops with more branches and leaves

and with high stalks should be selected.