本文由国家自然科学基金项目41301422、安徽大学博士科研启动基金项目33190223,J10118520143和安徽省国土资源科技项目2016-K-12资助;This work was supported by the Natural Science Foundation of China 41301422,the Doctoral Scientific Research Foundation of Anhui University33190223,J10118520143 and Technology Project of Land and Resources of Anhui Province 2016-K-12.