1. College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
2. College of Natural Resources and Environment, Northwest Agriculture and Forestry University, Xianyang 712100, China
3. Institute of Soil and Water Conservation, Northwest Agriculture and Forestry University, Xianyang 712100, China
4. Key Laboratory for Forest Ecosystem Process and Management of Fujian Province, Fuzhou 350002, China