1. Research Unit for Comparative Microbiome Analysis, Department of Environmental Science; Helmholtz Zentrum München D-85758 Oberschleissheim Germany
2. Soil Biology, Institute of Soil Science and Land Evaluation, University of Hohenheim; D-70599 Stuttgart Germany
3. Institute of Biochemical Plant Pathology, Department of Environmental Science; Helmholtz Zentrum München D-85758 Oberschleissheim Germany
4. Institute for Groundwater Ecology, Department of Environmental Science; Helmholtz Zentrum München D-85758 Oberschleissheim Germany
5. Institute of Organic Agriculture, University of Bonn; D-53115 Bonn Germany
6. Chair for Soil Science, Research Department Ecology and Ecosystem Management, Technische Universität München; D-85350 Freising-Weihenstephan Germany