1. Department of Physical Geography, Stockholm University, 10691 Stockholm, Sweden
2. Bolin Centre for Climate Research, Stockholm University, 10691 Stockholm, Sweden
3. Institute of Soil Science and Land Evaluation, Biogeophysics, University of Hohenheim, 70599 Stuttgart, Germany
4. Department of Environmental Microbiology, Helmholtz Centre for Environmental Research (UFZ), 04318 Leipzig, Germany
5. Department of Ecology and Evolutionary Biology, University of California Irvine, Irvine, California 92697, United States
6. Institute of Soil Science and Land Evaluation, Soil Biology, University of Hohenheim, 70599 Stuttgart, Germany
7. Federal Institute for Geosciences and Natural Resources (BGR), 30655 Hannover, Germany