作者单位:Liisa Ukonmaanaho (1) Mike Starr (2) Antti-Jussi Lindroos (1) Tiina M. Nieminen (1)
1. Finnish Forest Research Institute, P.O. Box 18, 01301, Vantaa, Finland 2. Department of Forest Sciences, University of Helsinki, P.O. Box 27, 00014, Helsinki, Finland