Effects of sewage sludge amendment on physico-chemical properties of mine tailings and physiological responses of Cinnamomum camphora Relationship among microbial groups,enzyme activity and physico-chemical properties under different artificial forestry in hilly red soil Characteristics of Growth and Soil Properties in a Mixed Stand of Pinus luchuensis and Schima wallichii kort. Ssp. Liukiuensis Bloenb. In Subtropical Zone