1. Faculty of Geography, Yunnan Normal University, Kunming 650500, China
2. School of History and Administration, Yunnan Normal University, Kunming 650500, China
3. Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, China
4. School of Geographical Sciences, Harbin Normal University, Harbin 150025, China