中文摘要：

[目的]揭示上海市杨浦区土壤重金属污染情况,为环境磁学在城市表土重金属污染的应用提供科学依据。[方法]结合磁学方法与传统化学方法,对杨浦区5个功能区内的17个表土样品进行磁学特征和重金属浓度的分析。[结果]杨浦区表土磁化率值平均值为2.42×10-6 m3/kg,磁性特征以低矫顽力的亚铁磁性矿物为主导,颗粒较粗。除频率磁化率外,磁学参数整体呈现工业区与交通区值较高的特点;重金属Zn,Pb,Cu,Cr浓度值高于背景值,且高值集中在工业区、交通区、居住区,污染负荷指数（PLI）的值为1.962,属于轻度污染。除工业区外,各功能区之间重金属含量与磁学参数的相关性较好（p〈0.05）,磁化率（χlf）、饱和等温剩磁（SIRM）、硬剩磁（HIRM）对杨浦区表土重金属含量有良好的指示作用。[结论]环境磁学方法可以快速简便地提供城市污染信息。

英文摘要：

[Objective] The heavy metal pollution of topsoil from Yangpu District of Shanghai City was illustrated to provide scientific basis for the application of environmental magnetism in heavy metal pollution.[Methods] A systematic analysis of 17 topsoil samples collected from 5 functional areas in Yangpu District was conducted. The analysis involved magnetic characteristics and heavy metal concentration using magnetic method and traditional chemical method.[Results] The average magnetic susceptibility of the topsoil in Yangpu District was 2.42×10-6 m3/kg, and the soil was characterized by low-coercivity magnetite and coarse grain size particles. The values of magnetic parameters, including magnetic susceptibility（χlf） saturation isothermal remanent magnetization（SIRM）, the susceptibility of anhysteretic remanent magnetization（χARM）, χARM/χlf, χARM/SIRM, S-ratio（IRM-300/SIRM） and magnetically hard isothermal remanent magnetization（HIRM））, were high in industrial and traffic area. The concentrations of Zn, Pb, Cu, and Cr were much higher than the background values. The relatively high heavy metal values were found concentrated in industrial, traffic and residential areas. Generally, the pollution loading index（PLI） value was 1.962, belonging to mild contamination. Except in industrial area, the contents of heavy metal in other areas were significantly correlated with magnetic parameters. χlf, SIRM and HIRM can be generally regarded as good indicators of heavy metal concentration of topsoil in Yangpu District.[Conclusion] Environmental magnetism is capable of indicating heavy metal pollution in topsoil.