Institute of Geographic Sciences and Natural Resources Research;
CAS;
Beijing 100101;
China;
Changjiang Institute of Survey;
Planning;
Design and Research Co.;
Ltd.;
Wuhan 430010;
China;
Environmental Science Program;
Beijing Normal University-Hong Kong Baptist University United International College;
Zhuhai 519080;
Guangdong;
China;
College of Resources and Environment;
University of Chinese Academy of Sciences;
Beijing 100049;
China;
modified export coefficient model; pollution load; non-point source pollution; total nitrogen; total phosphorus;