1. Soil Physics and Land Management, Environmental Sciences Group; Wageningen University; Droevendaalsesteeg 4 6708 PB Wageningen The Netherlands
2. Physical Geography; Catholic University of Eichstätt-Ingolstadt; Ostenstraße 18 85072 Eichstätt Germany
3. Soil Geography and Landscape Group, Environmental Sciences Group; Wageningen University; Droevendaalsesteeg 4 6708 PB Wageningen The Netherlands
4. Institute for Biodiversity and Ecosystem Dynamics (IBED), Computational Geo-Ecology; University of Amsterdam; P.O. Box 94248 1090 GE Amsterdam The Netherlands