Affiliation: | 1.Department of Forest Sciences, University of Helsinki, Latokartanonkaari 7, P.O. Box 27, 00014, Helsinki, Finland ;2.Vantaa Unit, Finnish Forest Research Institute (Metla), P.O. Box 18, 01301, Vantaa, Finland ;3.Joensuu Unit, Finnish Forest Research Institute (Metla), P.O. Box 68, 80101, Joensuu, Finland ; |