1. Department
of Earth and Environmental Science, Division of Soil and Water Management, KU Leuven, Kasteelpark Arenberg 20, B-3001 Heverlee, Belgium
2. Department
of Soil and Environment, Swedish University of Agricultural Sciences (SLU), Box 7014, 750 07 Uppsala, Sweden
3. Department
of Microbial and Molecular Systems, Centre for Surface Chemistry and
Catalysis, KU Leuven, Celestijnenlaan 200F − 02461, B-3001 Heverlee, Belgium