1. Swiss Federal Research Institute for Forest; Snow and Landscape WSL, Forest Dynamics; Zürcherstrasse 111 8903 Birmensdorf Switzerland
2. Paul Scherrer Institute PSI, Lab for Atmospheric Chemistry; Ecosystem Fluxes Research Group; 5232 Villigen PSI Switzerland
3. Berlin-Brandenburg Institute of Advanced Biodiversity Research BBIB; Altensteinstr. 6 14195 Berlin Germany
4. ETH Zürich; Institute of Agricultural Sciences, Universitätsstrasse 2; 8092 Zürich Switzerland
5. Lamont-Doherty Earth Observatory; Columbia University; 61 Route 9W Palisades 10964 USA