1. Center for Ecosystem Science and Society, Department of Biological Sciences; Northern Arizona University; Flagstaff AZ USA
2. Department of Soil and Water Conservation; Nanjing Forestry University; Nanjing China
3. Department of Microbiology and Plant Biology; University of Oklahoma; Norman OK USA
4. Laboratoire des Sciences du Climat et de l'Environnement; Gif-sur-Yvette France
5. Earth, Ocean and Atmospheric Sciences; Florida State University; Tallahassee FL USA
6. Environmental Sciences Division and Climate Change Science Institute; Oak Ridge National Laboratory; Oak Ridge TN USA
7. U.S. Forest Service, Northern Research Station; Center for Research on Ecosystem Change; Grand Rapids MN USA
8. Department of Earth System Science; Tsinghua University; Beijing China