title: Factors affecting HCH and DDT in soils around watersheds of Beijing reservoirs, China.
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.
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 100085, Beijing, China.
authors.forename: Wenyou
authors.initials: W
authors.lastname: Hu
authors.forename: Yonglong
authors.initials: Y
authors.lastname: Lu
authors.forename: Tieyu
authors.initials: T
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Luo
authors.forename: Xiang
authors.initials: X
authors.lastname: Zhang
authors.forename: Jing
authors.initials: J
authors.lastname: Geng
authors.forename: Guang
authors.initials: G
authors.lastname: Wang
authors.forename: Yajuan
authors.initials: Y
authors.lastname: Shi
authors.forename: Wentao
authors.initials: W
authors.lastname: Jiao
authors.forename: Chunli
authors.initials: C
authors.lastname: Chen
mesh_terms: D002681:China; D003634:DDT / Q000032:analysis*; D004784:Environmental Monitoring; D001556:Hexachlorocyclohexane / Q000032:analysis*; D007700:Kinetics; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D014881:Water Supply / Q000032:analysis
chemical_list: D012987:Soil; D012989:Soil Pollutants; D001556:Hexachlorocyclohexane; D003634:DDT