1. Laboratory for Air Pollution & Environmental Technology, Empa; Swiss Federal Laboratories for Materials Science and Technology; Überlandstr. 129, CH-8600 Dübendorf Switzerland
2. Department of Chemical Science and Engineering; Tokyo Institute of Technology; 4259 Nagatsuta, Midori-ku Yokohama 226-8502 Japan
3. Stable Isotope Laboratory (IsoLab); Max-Planck-Institute for Biogeochemistry (MPI-BGC); Hans-Knöll-Str. 10, D-07745 Jena Germany
4. Forest Soils and Biogeochemistry; WSL; Zürcherstrasse 111, CH-8903 Birmensdorf Switzerland
5. Biogeochemistry; University of Basel; Bernoullistrasse 30, CH-4056 Basel Switzerland
6. Sustainable Agroecosystems; ETH Zürich; Tannenstrasse 1, CH-8092 Zürich Switzerland
7. Institute of Agricultural Sciences, ETH Zürich; Universitätstrasse 2; CH-8092 Zürich Switzerland
8. Earth-Life Science Institute; Tokyo Institute of Technology; 2-12-1 Ookayama, Meguro-ku Tokyo 152-8550 Japan