1. Institute of EcologyUniversity of Innsbruck Innsbruck Austria
2. Max Planck Institute for Biogeochemistry Jena Germany
3. Forest Research Group, Universidad de Extremadura Plasencia Spain
4. Department of Environmental EngineeringTechnical University of Denmark Kongens Lyngby Denmark
5. Institute of Agricultural and Environmental SciencesEstonian University of Life Sciences Tartu Estonia