1. International Center for Climate and Global Change Research and School of Forestry and Wildlife Sciences; Auburn University; Auburn AL USA
2. Research Center for Eco-Environmental Sciences, State Key Laboratory of Urban and Regional Ecology; Chinese Academy of Sciences; Beijing China
3. Department of Ecology, Evolutionary, and Organismal Biology; Iowa State University; Ames IA USA
4. Department of Plant and Soil Sciences, College of Agriculture, Food and Environment; University of Kentucky; Lexington KY USA
5. School of Historical Studies; Institute for Advanced Study; Princeton NJ USA
6. Department of Geology and Geography; West Virginia University; Morgantown WV USA