1. Key Laboratory of Plant-Soil Interactions (MOE), College of Resources and Environmental Sciences, China Agricultural University, Beijing, China;
2. Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Gilat Research Center, M.P. Negev, Israel;
3. Department of Soil and Water Sciences, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel