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Soil Seed Bank Properties under Different Land-used Models on Sloping-land with Purple Soils in Hengyang of Hunan Province,South-central China Changes of soil properties in re-vegetation stages on sloping-land with purple soils in hengyang of Hunan Province, South-central China Dynamic Changes of Soil Microbial Biomass and Soil Nutrients along Re-Vegetation on Sloping-Land with Purple Soils in Hengyang of Hunan Province, South-Central China