1. Department of Plant and Microbial Biology University of Minnesota St Paul MN 55108 USA
2. Center of Forest Ecosystem Studies and Qianyanzhou Station Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China
3. Climate Change Science Institute and Environmental Sciences Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA
4. Intercollege Graduate Degree Program in Ecology The Pennsylvania State University University Park PA 16802 USA
5. Department of Ecosystem Science and Management The Pennsylvania State University University Park PA 16802 USA
6. University of the Chinese Academy of Sciences Beijing 100101 China
7. Plant Sciences (IBG‐2) Forschungszentrum Jülich GmbH Jülich D‐52425 Germany
8. Department of Forest Resources University of Minnesota St Paul MN 55108 USA
9. Hawkesbury Institute for the Environment University of Western Sydney Penrith NSW 2751 Australia
10. Institute of Dendrology Polish Academy of Sciences Parkowa 5 Kórnik 62‐035 Poland
11. Department of Biological Sciences George Washington University Washington DC 20052 USA