1. State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and Hydropower, Sichuan University Chengdu China
2. State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science Beijing Normal University Beijing China
3. Department of Ecosystem Science and Management The Pennsylvania State University University Park PA USA
4. USDA Forest Service, Southern Research Station, 81 Carrigan Drive, Aiken Center University of Vermont Burlington VT USA