Since 1999, eco-geochemical survey has been carried out in more than 20 provinces, municipalities and autonomous regions in China. The eco-geochemical survey was named from Russia literature and defined as a subject on research mechanisms of transportatio Since 1999, eco-geochemical survey has been carried out in more than 20 provinces, municipalities and autonomous regions in China. The eco-geochemical survey was named from Russia literature and defined as a subject on research mechanisms of transportatio