Institute of Forest Sciences,Faculty of Environment and Natural Resources,University of Freiburg,Tennenbacherstr.4,D-79106 Freiburg,Germany;
Swiss Federal Research Institute WSL,Zürcherstrasse 111,CH-8903 Birmensdorf,Switzerland;
Institute of Forest Sciences,Faculty of Environment and Natural Resources,University of Freiburg,Tennenbacherstr.4,D-79106 Freiburg,Germany;
Institute of Forest Sciences,Faculty of Environment and Natural Resources,University of Freiburg,Tennenbacherstr.4,D-79106 Freiburg,Germany;