摘要
An extensive soil investigation was conducted in different domains of Changchun to disclose the fractionations of Pb, Cu, Cd, Zn and Ni in urban soils. Meanwhile correlation analysis and multiple stepwise regressions were used to define relationships between soil properties and metal fractions and the chief factors influencing the fractionation of heavy metals in the soils. The results showed that Pb, Ni and Cu were mainly associated with the residual and organic forms; most of Cd was concentrated in the residual and exchangeable fractions. Zn in residual and carbonate fraction was the highest. The activities of the heavy metals probably declined in the following order: Cd, Zn, Pb, Cu and Ni. The chemical fractions of heavy metals in different domains in Changchun City were of significantly spatial heterogeneity. Soil properties had different influences on the chemical fractions of heavy metals to some extent and the main factors influencing Cd, Zn, Pb, Cu and Ni fractionation and transformation were apparently different.
An extensive soil investigation was conducted in different domains ofChangchun to disclose the frac-tionations of Pb, Cu, Cd, Zn and Ni in urban soils. Meanwhilecorrelation analysis and multiple stepwise regressions were used to define relationships betweensoil properties and metal fractions and the chief factors influencing the frac-tionation of heavymetals in the soils. The results showed that Pb, Ni and Cu were mainly associated with the residualand organic forms; most of Cd was concentrated in the residual and exchangeable fractions. Zn inresidual and carbonate fraction was the highest. The activities of the heavy metals probablydeclined in the following order: Cd, Zn, Pb, Cu and Ni. The chemical fractions of heavy metals indifferent domains in Changchun City were of significantly spatial heterogeneity. Soil properties haddifferent influences on the chemical fractions of heavy metals to some extent and the main factorsinfluencing Cd, Zn, Pb, Cu and Ni fractionation and transformation were apparently different.
