1. College
of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
2. Key
Laboratory of Agricultural Water Resources, Center for Agricultural
Resources Research, Institute of Genetic and Developmental Biology, The Chinese Academy of Sciences, 286 Huaizhong Road, Shijiazhuang 050021, Hebei China
3. Department
of Soil Quality, Wageningen University, P.O. Box 47, 6700 AA, Wageningen, The Netherlands