1. CAS Key Laboratory of Forest Ecology and Management Institute of Applied Ecology, Chinese Academy of Sciences Shenyang PR China
2. Department of Reclamation of Arid and Mountainous Regions Natural Resources Faculty, University of Tehran Karaj Iran
3. Forest Ecology Research Group College of Life Sciences, Hebei University Baoding Hebei PR China
4. Lancaster Environment Centre Lancaster University Lancaster UK
5. Smithsonian Tropical Research Institute Panama City Panama
6. Institute of Plant Sciences, University of Bern Bern Switzerland