[1]Agricultural Information Institute;
Chinese Academy of Agricultural Sciences;
Beijing 100081;
P.R.China;
[2]Key Laboratory of Intelligent Agricultural Early Warning Technology;
Ministry of Agriculture;
Beijing 100081;
P.R. China;
[3]Key Laboratory of Intelligent Agricultural Early Warning Technology and System;
Chinese Academy of Agricultural Sciences Beijing 100081;
P.R.China;
[4]Institute of Geographical Sciences and Natural Resources Research;
Chinese Academy of Sciences;
Beijing 100101;
P.R. China;
[5]College of Economics & Management;
China Agricultural University;
Beijing 100081;
P.R. China;