Algal Fossils from Late Precambrian Banded Manganese Formation (BMF), Xiangtan, Hunan Province of China Biological cycling of Koelreuteria paniculata plantation microelements in Xiangtan Manganese Mine wasteland Soil physical and chemical properties of the wasteland in Xiangtan manganese mine Dynamics of carbon storage at different aged Koelreuteria paniclata tree in Xiangtan Mn mining wasteland Monitoring and Analysis of Vegetation Fractional Cover in Changsha-Zhuzhou-Xiangtan Core Region Based on Remote Sensing Data