1. Yanchi Research Station; School of Soil and Water Conservation; Beijing Forestry University; Beijing China
2. UMR 5805 EPOC; University of Bordeaux; Talence Cedex France
3. Engineering Research Centre of Forestry Ecological Engineering; Ministry of Education; Beijing Forestry University; Beijing China
4. Key Laboratory of State Forestry Administration on Soil and Water Conservation; Beijing Forestry University; Beijing China