Institute of Agricultural Resources and Regional Planning;
Chinese Academy of Agricultural Sciences;
Beijing 100081;
P.R.China;
Institute for the Study of Earth;
Oceans and Space;
University of New Hampshire;
Durham;
NH 03824;
USA;
Department of Geology and Soil Science (WE13)/Laboratory of Soil Science;
Ghent University;
Gent B-9000;
Belgium;