Soil Seed Bank Properties under Different Land-used Models on Sloping-land with Purple Soils in Hengyang of Hunan Province,South-central China Adaptability of agricultural ecosystems in the hilly areas in Southern China: a case study in Hengyang Basin Changes in SBR and qCO2 at Different Re-vegetation Stages on Slopingland with Purple Soils in Hengyang of Hunan Province, South-central China Soil enzyme activities in different re-vegetation stages on sloping-land with purple soils in Hengyang of Hunan Province,  China Changes of soil properties in re-vegetation stages on sloping-land with purple soils in hengyang of Hunan Province, South-central China Site Evaluation of Chinese Fir and Its Application in Hengyang Area