title: Characteristics of residual organochlorine pesticides in soils under different land-use types on a coastal plain of the Yellow River Delta.
abstract: The residual levels of organochlorine pesticides (OCPs) were examined in soils covering five types of land use along a salinity gradient on the Yellow River Delta. The most prominent OCPs were dichlorodiphenyltrichloroethane (∑DDT, arithmetic mean = 5.11 μg kg(-1)), hexachlorocyclohexane (∑HCH, 1.69 μg kg(-1)) and ∑endosulfan (10.4 μg kg(-1)). The spatial variability of OCPs composition shifted from γ-HCH and o,p'-DDT dominated pesticides in coastal soils to p,p'-DDE dominated pesticides in inland soils. In different land-use types, the percentages of β-HCH and p,p'-DDE are characterized by more recalcitrant components in decreasing order of vegetable fields, cereal fields, cotton fields, wetlands and tidal flats with increasing soil salinity. However, the less recalcitrant components, γ-HCH and o,p'-DDT, showed an opposite trend. Endosulfan sulfate predominated in all land-use types. Residual levels of β-HCH were affected by soil organic matter. The correlations between γ-HCH and clay content and between p,p'-DDE, o,p'-DDT and salinity might associate with the influence of sediment cotransport by the Yellow River and the density of anthropogenic activities in coastal region. Depth distribution of the OCPs in typical soil profiles also implied that local historical usage and sediment transport by the Yellow River both affected the OCPs residual in this region.
authors.affiliation: Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, China.|University of Chinese Academy of Sciences, Beijing, 100049, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Li
authors.affiliation: Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, China.|University of Chinese Academy of Sciences, Beijing, 100049, China.
authors.forename: Haibo
authors.initials: H
authors.lastname: Zhang
authors.affiliation: College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China.
authors.forename: Qingbo
authors.initials: Q
authors.lastname: Li
authors.affiliation: Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, China.|University of Chinese Academy of Sciences, Beijing, 100049, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhou
authors.affiliation: Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, China.|University of Chinese Academy of Sciences, Beijing, 100049, China.
authors.forename: Xiaobing
authors.initials: X
authors.lastname: Chen
authors.affiliation: Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Tu
authors.affiliation: Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, China. ymluo@yic.ac.cn.|University of Chinese Academy of Sciences, Beijing, 100049, China. ymluo@yic.ac.cn.
authors.forename: Yongming
authors.initials: Y
authors.lastname: Luo
authors.affiliation: Agri-Food and Biosciences Institute, Newforge Lane, Belfast, BT9 5PX, UK.
authors.forename: Peter
authors.initials: P
authors.lastname: Christie
authors.affiliation: Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, China.|University of Chinese Academy of Sciences, Beijing, 100049, China.
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Hu
authors.affiliation: Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, China.
authors.forename: Lianzhen
authors.initials: L
authors.lastname: Li
mesh_terms: D002681:China; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D006843:Hydrocarbons, Chlorinated; D010573:Pesticide Residues; D012989:Soil Pollutants
keywords: Coastal zone; Land-use types; Organochlorine pesticides; Salinity gradient; Yellow River Delta