College of Earth Sciences, East China Institute of Technology, Nanchang, Jiangxi 330013, China;
Geography and Planning School, Sun Yat-sen University, Guangzhou, Guangdong 510275, China;
Geography and Planning School, Sun Yat-sen University, Guangzhou, Guangdong 510275, China;
School of Geography, South China Normal University, Guangzhou, Guangdong 510631, China;
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi 'an,Shaanxi 710061, China;
Department of Tourism, Huizhou University, Huizhou, Guangdong 516007, China;