1. School of Geographic Sciences, Hunan Normal University, Changsha 410081, China
2. College of Geography and Tourism, Hengyang Normal University, Hengyang 421002, China
3. Hunan Provincial Key Laboratory for Eco-Environmental Changes and Carbon Sequestration of the Dongting Lake Basin, Changsha 410081, China
4. College of Ecology and Environment, Xinjiang University, Urumqi 830046, China