1. Department of Agricultural Soil Science; University of Göttingen; Büsgenweg 2 Göttingen 37077 Germany
2. Department of Soil Science and Temperate Ecosystems; University of Göttingen; Büsgenweg 2 Göttingen 37077 Germany
3. Institute of Physicochemical and Biological Problems in Soil Science; Russian Academy of Sciences; 142290 Pushchino Russia
4. Department of Soil Science of Tropical and Subtropical Ecosystems; University of Göttingen; Büsgenweg 2 Göttingen 37077 Germany
5. Key Laboratory of Ecosystem Network Observation and Modeling; Institute of Geographic Sciences and Natural Resources; Chinese Academy of Sciences; Beijing 100101 China
6. Centre for Stable Isotope Research and Analysis; University of Göttingen; Büsgenweg 2 37077 Göttingen Germany
7. Institute of Environmental Sciences; Kazan Federal University; 420049 Kazan Russia
8. Agro-Technology Institute; RUDN University; Moscow Russia