摘要：Based on the field investigation, 197 soil samples were collected to analyse the concentration and speciationdistribution characteristics of Cd, Cu, Pb, Cr and Zn. The relationships between the soil acid chemicalproperties and the speciation of heavy metals were studied in this paper. The results showed that the contentof Cd, Cu, Pb, Cr and Zn in the soil significantly increased compared with the Second National Soil Survey.Comparing with the standard of National Soil Environmental Quality, the heavy metals of soil in the Chengduplain has polluted the soil to certain degree. For the form distribution of soil heavy metal, Cd was mainlypresented in the Fe-Mn oxidation bound and Cu, Pb, Cr, Zn mainly consisted in the residual form. There wascertain correlation between each active state (exchangeable form, carbonate state, Fe-Mn oxidation stateand organic combination state), which could be converted mutually and had strong potential hazards toenvironment. The acid chemical properties of soil had notable or highly notable impact on the pattern distributionof heavy metals. Soil pH had obvious effect on the liable morphological changes of Cd, Pb and Zn. The soilacid buffer property (soil acid damage capacity) had highly significant positive correlation with exchangeableform, carbonate state, Fe-Mn oxidation state and liable speciation of Cd in the soil, while had highly significantnegative correlation with exchangeable form, organic bound and liable speciation of Cr in the soil, andremarkable negative or positive correlation with exchangeable form, organic bound, carbonate state and FeMn oxidation of Zn in the Chengdu Plain.
