摘要
///Typical karst tiankengs,located in the Leye County,Guangxi,were chosen as the study area.The soil samples collected from different karst topography were analyzed for hexachlorocyclohexane(HCHs) and dichloro-diphenyl-trichloroethane(DDTs) by using GC-ECD.The results show that the concentration of total organochilorine pesticides (OCPs) in the bottom soils was obviously higher than that of the top soils.Consequently,Dashiwei karst tiankengs showed an obvious “cold trap effect” of organic pollutants.