1. Swiss Federal Research Station for Agroecology and Agriculture (FAL); Reckenholzstrasse 191 CH-8046 Zurich Switzerland
2. University of Connecticut; Dep. of Civil and Environmental Engineering; 261 Glenbrook Road Storrs CT 06269-2037
3. Laboratory of Soil & Environmental Physics (LASEP); School of Architectural, Civil and Environmental Engineering (ENAC) Ecole Polytechnique Federale de Lausanne (EPFL); CH-1015 Lausanne Switzerland