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CONTENTS AND DISTRIBUTION OF SOME HEAVY METAL ELEMENTS IN THE VEGETABLE CULTIVATED SOILS IN CHINA

Zhang Min and Gong Zitong(Institute of Soil Science,Academia Sinica,Nanjing 210008)  
The total and available contents of several heavy metal elements in thirty-seven Profiles of Fimus soils, different vegetable cultivated mellow soils and corresponding grain crop soils derived from different original soils in China were studied.The distribution characteristics of heavy metals,the relationships between total and available element contents, between elements and some soil properties,and among elements were elucidated. Results showed that as the ripening degree increased,there was an evident increase tendency of increase in the contents of Zn,Pb,Cu and Cd.Total and available metal element contents decreased with the soil depth.In Fimus soils,the elemental contents were higher in the upper horizon of 0 to 40 cm and decreased dramatically below the transitional horizons due to the thicker fimic epipedons.In the moderately and slightly ripening vegetable cultivated soils,element contents were higher only in the surface horizons and decreased sharply below surface horizons,but there were no evident changes in the profiles of grain crop soils.Correlation analyses indicated that there existed significant positive correlations among Zn, Pb and Cu,and between total and available contents of elements,available P and available elemental contents.There was no significant relationship between pH and CaCO3 on the one hand and Zn, Pb and Cu on the other.In contrast,total Fe and available Fe and Mn were found to bear significant negative correlations with pH and CaCO3 but no significant relationship existed between Fe and Mn contents and organic matter contents,suggesting that Fe and Mn contents had no retationship with the ripening processes.However, Zn,Pb and Cu contents increased with the ripening degree.Therefore, Zn,Pb and Cu could be considered as the main contaminant elements in vegetable cultivated mellow soils.
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