1. Key Laboratory of the Three Gorges Reservoir Region’s Eco-environments, Ministry of Education, Institute of Environment and Ecology, Chongqing University, 174 Shapingba Road, Chongqing 400045, P.R. China
2. School of Architecture and Urban Planning, Chongqing Jiaotong University, 66 Xuefu Avenue, Chongqing 400074, P.R. China
3. Key Laboratory of Agro-ecological Processes in Subtropical Regions, Changsha Research Station for Agricultural & Environmental Monitoring, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan 410125, P.R. China