Factors affecting HCH and DDT in soils around watersheds of Beijing reservoirs,China |
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Authors: | Wenyou Hu Yonglong Lu Tieyu Wang Wei Luo Xiang Zhang Jing Geng Guang Wang Yajuan Shi Wentao Jiao Chunli Chen |
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Institution: | (1) State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 100085 Beijing, China;(2) Graduate School of Chinese Academy of Sciences, 100039 Beijing, China; |
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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 long-distance transportation and inputs from surrounding weathered agricultural
soils may also serve as important sources of HCH and DDT residues in the watersheds. |
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