Influence of Grassland Ecosystems Shift on Soil Organic Carbon in the Karst Mountain Area of Guizhou Province Effects of different land-use types on soil enzyme activity in karst mountain areas of Southwest Guangxi Soilmicrobial biomass and active characters under different land-use types in karst mountain areas of southwest Guangxi Fire Resistance of Leaves During Fire Prevention Period of Nine Common Tree Species in Karst Mountain Regions The processes of land rocky desertification in typical Karst Mountain area: a case study in the karst mountain area of North Guangdong Influence of fire on stands of Pinus massoniana in a karst mountain area of central Guizhou province Effect of land use on the characteristics of organic carbon and labile organic carbon in soil aggregates in Karst mountain areas