[1]Institute of Agricultural Resources and Regional Planning;
Chinese Academy of Agricultural Sciences;
Beijing 100081;
P.R. China;
[2]CAAS-UGent Joint Laboratory of Global Change and Food Security;
Beijing 100081;
P.R. China;
[3]Department of Geology and Soil Science (WE13);
Ghent University;
9000 Gent;
Belgium;
[4]Earth and Life Institute;
Universite Catholique de Louvain;
1348 Louvain-la-Neuve;
Belgium;