湖州市土壤磁化率与重金属元素分布规律及其相关性研究

Distribution of Soil Magnetic Susceptibility and Heavy Metal Elements and Their Correlativity in Huzhou City

通过对84个地表土样、17个剖面土样和11个基岩样的磁参数与化学分析测试,对湖州市进行了土壤磁化率与重金属元素分布规律、成因及两者的相关性研究。结果表明:表层土壤磁化率高值异常区与土壤重金属元素高值分布区吻合程度非常高,剖面土壤磁化率值与重金属元素含量总体上均呈向下递减的相同特点;表层土壤磁化率与重金属元素高值异常均系人类经济工程活动影响所致,主要与当地城镇生活垃圾随意堆放、垃圾施肥、工业粉尘、废气、废物和污水排放、农药和化肥的过量使用等有关;表层土壤磁化率值与重金属元素Cd、Hg、Pb、As和Cr含量之间在不同环境条件下相关性有着明显的差异。在旱地土壤中磁化率与重金属元素Hg、Pb高度相关,与Cd、As和Cr不相关;在水田土壤中磁化率与重金属元素Pb、As高度相关,与Cd显著相关,而与Hg、Cr不相关。

Based on the test results of magnetic parameters and chemical analysis of 84 surface and 17 section soil samples, 11 rock samples, the distribution of soil magnetic susceptibility and heavy metal elements, origin and their correlativity were studied in Huzhou City where industry and agriculture are flourishing. The study revealed that： The high anomalous areas of magnetic susceptibility are consistent with those of soil heavy metal elements in the surface soils in the Huzhou City of developed industry and agriculture areas; The magnetic susceptibility and heavy metal element contents in the section soils are both decreasing from the upper to the lower; The high anomaly of the magnetic susceptibility and heavy metal element contents in the surface soils resulted from the influence of man-kind economic and engineering activities in Huzhou City, such as free piling up mucipal garbage, applying garbage as fertilizer, discharge of industrial waste gas, material and water, over-application of pesticide and chemical fertilizer in the local towns; It is obvious that the correlativity between soil magnetic susceptibility and Cd, Hg, Pb,As and Cr contents are different in the different environmental conditions. In dry land magnetic susceptibility is highly correlated with Hg and Pb and has poor correlativity with Cd, As and Cr; in paddyfield magnetic susceptibility is highly correlated with Pb and As, and evidently with Cd and no correlativity with Hg and Cr.