1. State Key Laboratory of Vegetation and Environmental Change; Institute of Botany; Chinese Academy of Sciences; Beijing 100093 China
2. Research Network of Global Change Biology; Beijing Institutes of Life Science; Chinese Academy of Sciences; Beijing 100101 China
3. University of Chinese Academy of Sciences; Beijing 100049 China
4. International Center for Ecology, Meteorology, and Environment (IceMe); Nanjing 210044 China
5. CGCEO/Geography; Michigan State University; East Lansing Michigan 48823 USA
6. Department of Forest Resources; University of Minnesota; St. Paul Minnesota 55108 USA
7. Hawkesbury Institute for the Environment; University of Western Sydney; Penrith New South Wales 2753 Australia
8. State Key Laboratory of Forest and Soil Ecology; Institute of Applied Ecology; Chinese Academy of Sciences; Shenyang 110164 China
9. Department of Biology and Graduate Degree Program in Ecology; Colorado State University; Fort Collins Colorado 80523 USA
10. Key Laboratory of Ecosystem Network Observation and Modeling; Synthesis Research Center of Chinese Ecosystem Research Network; Institute of Geographic Sciences and Natural Resources Research; Chinese Academy of Sciences; Beijing 100101 China
11. Environmental Studies; University of California; Santa Cruz California 95064 USA
12. National Soil Fertility and Fertilizer Effects Long-term Monitoring Network; Institute of Agricultural Resources and Regional Planning; Chinese Academy of Agricultural Sciences; Beijing 100081 China