Marcel Gaj1,2, Stephan Kaufhold2, Jeffrey J McDonnell1. 1. Global Institute for Water Security, School of Environment and Sustainability, University of Saskatchewan, 117 Science Park, Saskatoon, S7N 5A2, Canada. 2. Federal Institute for Geosciences and Natural Resources - Soil as a Resource, Stilleweg 2, Hannover, 30655, Germany.