1. Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB)Chemical Analytic and BiogeochemistryBerlinGermany
2. Leibniz Centre for Agricultural Landscape Research (ZALF)Institute of Landscape BiogeochemistryMünchebergGermany
3. Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB)Experimental LimnologyBerlinGermany
4. Leibniz Centre for Agricultural Landscape Research (ZALF), Institute of Soil LandscapeStechlin, MünchebergGermany
5. Swiss Federal Institute for Forest, Snow and Landscape Research WSLBirmensdorfSwitzerland
6. Institute of Biochemistry and BiologyPotsdam UniversityPotsdamGermany
7. Leibniz Centre for Agricultural Landscape Research (ZALF)Institute of Landscape HydrologyMünchebergGermany
8. USDA Forest Service, Northern Research StationLawrence Livermore National LaboratoryLivermore, California 94550USA
9. Institute of Earth and Environmental SciencesPotsdam UniversityPotsdamGermany
10. Aarhus UniversityDepartment of BioscienceSilkeborgDenmark