1. International Center for Climate and Global Change Research, School of Forestry and Wildlife Sciences, Auburn University, Auburn, Alabama, 36849USA
2. Department of Plant and Soil Sciences, College of Agriculture, Food and Environment, University of Kentucky, Lexington, Kentucky, 40506USA
3. Eastern Forest Environmental Threat Assessment Center, USDA Forest Service, Raleigh, North Carolina, USA
4. State Key Lab of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085China
5. Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101China
6. Department of Earth and Environmental Sciences, Lehigh University, 1 W. Packer DriveBethlehem, Pennsylvania, 18015-3188USA
7. The Ecosystem Center, Marine Biological Laboratory, Woods Hole, Massachusetts, 02543USA
8. Joint Program on Science and Policy of Global Change, Massachusetts Institute of Technology, 77 Massachusetts AvenueCambridge, Massachusetts, 02139USA