1. Institute of Geography Augsburg University Augsburg 86159 Germany
2. Department of Environment Ghent University Ghent 9000 Belgium
3. Department of Green Chemistry and Technology, Isotope Bioscience Laboratory – ISOFYS Ghent University Ghent 9000 Belgium
4. Faculty of Agricultural Sciences Université Catholique de Bukavu Bugabo 02 Bukavu Democratic Republic of the Congo
5. Department of Environmental Systems Science ETH Zurich Zurich 8092 Switzerland
6. Institute of Soil Science and Site Ecology Technische Universität Dresden Tharandt 01737 Germany
7. Department of Forest and Soil Sciences Institute of Forest Ecology, University of Natural Resources and Life Sciences Vienna (BOKU) Vienna 1190 Austria