1. Key Laboratory of Mountain Hazards & Surface Process, Institute of Mountain Hazards and Environment; Chinese Academy of Sciences; 610041 Chengdu PR China
2. Division of Geography and Tourism, Department of Earth and Environmental Sciences; Katholieke Universiteit Leuven; Celestijnenlaan 200E BE-3001 Heverlee Belgium
3. Institute of Tropical Eco-agricultural Sciences; Yunnan Academy of Agricultural Sciences; Yuanmou 651300 Yunnan PR China