1. Physics of Soils and Terrestrial Ecosystems, Department of Environmental Systems Science, ETH Zurich , Zurich , Switzerland
2. Soil Physics, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth , Bayreuth , Germany
3. Agronomy and Plant Genetics, College of Food, Agricultural and Natural Resource Sciences, University of Minnesota , Twin Cities, MN , USA