Affiliation: | Ecological Laboratory, Department of Environmental Sciences, University of Kuopio, P.O. Box 1627, FIN-70211 Kuopio, Finland;The Finnish Forest Research Institute, Suonenjoki Research Station, FIN-77600 Suonenjoki, Finland;The Estonian Forest Research Institute, Róómu tee 2, EE-240 Tartu, Estonia;The Finnish Forest Research Institute, Department of Forest Ecology, P.O. Box 18, FIN-01301 Vantaa, Finland |