Factors affecting HCH and DDT in soils around wate

Authors: Wenyou Hu Yonglong Lu Tieyu Wang Wei Luo Xiang Zhang Jing Geng Guang Wang Yajuan Shi Wentao Jiao Chunli Chen

Publish Date: 2009/05/31

Volume: 32, Issue: 2, Pages: 85-94

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Abstract

The factors that influence the dynamics of hexachlorocyclohexane HCH and dichlorodiphenyltrichloroethane DDT in soils around the watersheds of Beijing reservoirs were examined Compared with other studies on HCH and DDT in soils and established reference values the concentrations of HCH and DDT in soils around our study area were relatively low The relationships between HCH and DDT concentrations and land use soil texture and soil properties were discussed HCH and DDT concentrations were higher in arable soils than those in uncultivated fallow soils Although land use was the most important factor affecting HCH and DDT residues additional factors such as soil texture and soil total organic carbon were also involved in pesticide retention in soils The results indicated that the historical agricultural applications of HCH and DDT were the major source of their residues Atmospheric deposition as well as longdistance transportation and inputs from surrounding weathered agricultural soils may also serve as important sources of HCH and DDT residues in the watershedsThis study was supported by the National Basic Research Program of China “973” Research Program with Grant No 2007CB407307 the Knowledge Innovation Program of the Chinese Academy of Sciences with Grant No KZCX2YW4205 the National Key Technology RD Program with Grant No 2008BAC32B07 and the National Natural Science Foundation of China with Grant No 40601089 The authors are grateful to Professor Kurunthachalam Kannan Wadsworth Center Albany New York for his constructive comments

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