1. Department of Microbiology, University of Helsinki, P.O.Box 56, FIN-00014 Helsinki, Finland
2. Institute for Atmospheric and Earth System Research/Forest Sciences, Faculty of Agriculture and Forestry, University of Helsinki, P.O.Box 27, FIN-00014 Helsinki, Finland
3. Department of Agricultural Sciences, University of Helsinki, P.O.Box 56, FIN-00014 Helsinki, Finland
4. Natural Resources Institute Finland, P.O.Box 2, 00791 Helsinki, Finland
5. Collaborative Innovation Center of Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, NO.159, Longpan Road, Nanjing, 210037, China
6. Finnish Meteorological Institute FMI, Climate System Research, P.O.Box 503, FIN-00101 Helsinki, Finland