1. College of Forestry, Guangxi University, Nanning 530004, China
2. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
3. School of Mechanical Engineering, Guangxi University, Nanning 530004, China
4. Institute of Ecological Protection and Restoration, Chinese Academy of Forestry (CAF), Beijing 100091, China
5. International Center for Climate and Global Change Research, College of Forestry, Wildlife and Environment, Auburn University, Auburn, AL 36849, USA