贵州省国内一流学科建设项目“贵州师范大学地理学”黔教科研发[2017]85号;国家自然科学基金41263011;贵州省科学技术基金黔科合计省合[2012] 7005号Supported by Guizhou Province First-Class Subject Construction Project " Geography of Guizhou Normal University"85 [2017];the National Natural Science Foundation of China41263011;the Guizhou Province Science and Technology Foundation7005 [2012]