Groupe de foresterie pour le développement,Department of Environmental Sciences,ETH Zurich,8092 Zurich,Switzerland;
HELVETAS Swiss Intercooperation,3001 Berne,Switzerland;
Laboratory of Forest Resources,Forest Research Institute,720015 Bishkek,Kyrgyzstan;
Swiss Federal Research Institute WSL,Zürcherstrasse 111,8903 Birmensdorf,Switzerland;