University of Antwerp - Research Group Plants and Ecosystems, University of Innsbruck - Department of Ecology, University of Innsbruck - Department of Ecology, University of Vienna - Centre for Microbiology and Environmental Systems Science, University of Antwerp - StatUa Center for Statistics, University of Antwerp - Research Group Plants and Ecosystems, University of Innsbruck - Department of Ecology, University of Antwerp - Research Group Plants and Ecosystems, University of Vienna - Centre for Microbiology and Environmental Systems Science, Agricultural University of Iceland, Colorado State University, Fort Collins - Department of Soil and Crop Sciences and University of Antwerp - Research Group Plants and Ecosystems