USDA-ARS National Soil Erosion Research Lab,West Lafayette,IN,USA,E-mail:chihua@purdue.edu;
Institute of Soil & Water Conservation,Yangling,Shaanxi,P.R.China,E-mail:flzh@ms.iswc.ac.cn;
National Institute Agricultural Research(INRA),Orleans,FRANCE,Frederic,E-mail:Darboux@orleans.inra.fr;