1. Forest Soils and Biogeochemistry, Swiss Federal Institute for Forest, Snow and Landscape Research (WSL) Zürcherstrasse 111 Birmensdorf 8903 Switzerland
2. Forest Ecology, Institute of Terrestrial Ecosystems (ITES) ETH Zurich Universitätsstrasse 16 Zürich 8092 Switzerland
3. Department of Forest and Soil Sciences, Institute of Forest Ecology University of Natural Resources and Life Sciences (BOKU) Peter‐Jordan Straße 82 Vienna 1190 Austria
4. Environment Agency Austria Spittelauer Lände 5 Vienna 1090 Austria
5. Center for Health and Bioresources Austrian Institute of Technology GmbH (AIT) Konrad‐Lorenz‐Straße 24 Tulln 3430 Austria
6. Symbiocyte Konrad‐Lorenz‐Straße 24 Tulln 3430 Austria
7. Department of Forest Protection and Wildlife Management, Faculty of Forestry and Wood Technology Mendel University in Brno Zemědělská 3 Brno 613 00 Czech Republic