1. Chair of Tree Physiology, Institute of Forest Sciences, Albert-Ludwigs-Universität Freiburg, Georges-Köhler-Allee 53, 79110 Freiburg, Germany
2. Institute for Landscape Biogeochemistry, Leibniz Centre for Agricultural Landscape Research (ZALF), Eberswalderstr. 84, 15374 Müncheberg, Germany
3. Institute of Ecology, Leuphana University of Lüneburg, Scharnhorststrasse 1, 21335 Lüneburg, Germany
4. Department of Biology, Graduate Programs in Cell & Systems Biology and Ecology & Evolutionary Biology, University of Toronto, 3359 Mississauga Road, Mississauga, ON, Canada
5. Forest Research Institute of Baden-Württemberg (FVA), Wonnhaldestrasse 4, D-79100 Freiburg i. Brsg., Germany
6. Present address: Institute of Bio and Geosciences IBG-2, Plant Sciences, Forschungszentrum Jülich GmbH, Jülich, Germany
7. Centre for Biosystems Analysis (ZBSA), Habsburgerstr. 49, Albert-Ludwigs-Universität Freiburg, Germany
8. Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB), 14195 Berlin, Germany
9. Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), 8903 Birmensdorf, Switzerland