1. Life and Science Department, Central South University of Forestry and Technology, Changsha, Hunan 410004, China
2. Hunan Institute of Science and Technology Information, Changsha, Hunan 410004, China
3. National Engineering Laboratory for Applied Technology of Forestry & Ecology in South China, Changsha, Hunan 410004, China
4. College of Arts and Sciences, Governors State University, University Park, Illinois 60484, United States
5. Laboratory of Urban Forest Ecology of Hunan Province, Changsha, Hunan 410004, China