Institution: | (1) Department of Applied Biology, University of Helsinki, P.O. Box 27, 00014 Helsinki, Finland;(2) Department of Forest Ecology, University of Helsinki, P.O. Box 27, 00014 Helsinki, Finland;(3) Finnish Forest Research Institute, Suonenjoki Research Station, Juntintie 40, 77600 Suonenjoki, Finland;(4) North Karelia University of Applied Sciences, Tikkarinne 9, 80200 Joensuu, Finland |