1. Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences Beijing China
2. University of Chinese Academy of Sciences Beijing China
3. Rubenstein School of Environment and Natural ResourcesUniversity of Vermont Burlington VT USA
4. Center for Ecosystem Studies and SocietyDepartment of Biological SciencesNorthern Arizona University Flagstaff AZ USA
5. Department of Earth System ScienceTsinghua University Beijing China