1. Lab for Atmospheric Chemistry; Stable Isotopes and Ecosystem Fluxes; Paul Scherrer Institute PSI; Villigen; CH; 5232; Switzerland
2. Forest Ecology and Forest Management Group; Wageningen University; Wageningen; AA; 6700; The Netherlands
3. WSL Swiss Federal Institute for Forest; Snow and Landscape Research; Zuercherstrasse 111; Birmensdorf; CH; 8903; Switzerland
4. Swiss Federal Institute of Technology Zurich; Chair of Forest Ecology; Zurich; CH; 8092; Switzerland