1. Agroscope, Plant‐Soil Interactions Group Zurich8046Switzerland
2. Department of Plant and Microbial Biology University of Zurich 8008 Zurich Switzerland
3. Department of Forest Mycology and Plant Pathology Swedish University of Agricultural Sciences 75651 Uppsala Sweden
4. Institute of Biology Freie Universität Berlin 14195 Berlin Germany
5. Berlin‐Brandenburg Institute of Advanced Biodiversity Research (BBIB) 14195 Berlin Germany
6. Department of Environmental System Sciences Soil Resources Group ETH Zurich 8092 Zurich Switzerland