摘要：To provide scientific information in prevention and treatment of pesticide residues in Caohai Wetland,spatial distribution characteristics of DDTs and HCHs in surficial sediments and soils under different land uses surrounding the water body were studied.In March and Augest of 2016,sediments and surrounding soils were collected from the east (6 sampling sites),southwest (5 sampling sites) and northwest parts (5 sampling sites) of the Caohai wetland.Organochlorine pesticides content in samples were analyzed,and their pollution characteristics and pollution sources were discussed.The results showed that the average content of HCHs and DDTs in surficial sediments of Caohai Wetland was 3.36 ng.g-1 and 8.56 ng.g-1,respectively.The mean value of HCHs in soils from surrounding cropland,forestland and swamp meadow was 5.13 ng.g-1,2.84 ng.g-1 and 3.16 ng.g-1,respectively.While,The mean value of DDTs in soils from surrounding cropland,forestland and swamp meadow was 10.32 ng.-1,3.00 ng.g-1 and 8.58 ng.-1,respectively.Generally,the content of organochlorine pesticides in surficial sediments of Caohai Lake is higher in dry season than those in flood season,but the content of DDTs in sediments of the southwest and east parts of Caohai Lake is slightly higher in flood season than those in dry season.The contents of DDTs,HCHs and their sum in surficial sediments from the southwest part of the Caohai Lake were higher than those from the northwest part followed by from the east part.
关键词：Caohai;soil;Different use types;Organochlorine pesticide;Residues
