Study on the pattern of high benefit and special ecological agriculture in Kant Area-A case study from Fengshan County,Guangxi Zhuang Autonomous Region Spatio-temporal simulation of land cover scenarios in southwestern of China Diversity of arbuscular mycorrhizae of Viburnum utile in karst areas Grasslands eco-environment and stockbreeding development in the karst areas of Guizhou province Differential characteristics of soil δ15N under varying vegetation in karst areas