1. Department of Biogeochemical Processes Max‐Planck Institute for Biogeochemistry Hans‐Knoll Str. 10 07745 Jena Germany
2. Earth and Environmental Sciences Los Alamos National Laboratory Los Alamos NM 87545 USA
3. Princeton Environmental Institute Princeton University Princeton NJ 08544 USA
4. Institute for Systematic Botany and Ecology Ulm University D‐89081 Ulm Germany
5. Department of Biological Sciences Macquarie University Sydney NSW Australia