基于地质累积指数与内梅罗指数结合法的耕地土壤重金属污染空间分布

按8km×8km网格将聊城市耕地分为136个采样点，调查As、Cd、Cr、Cu、Hg、Ni、Pb、Zn等8种重金属的含量。采用地质累积指数与内梅罗指数相结合的综合指数法进行污染评价，并以此判断重金属污染的程度；并对8种重金属进行各样点的含量差异分析；最后，应用ArcGIS8.3，以污染评价结果为数据支持，进行重金属污染空间分布研究。新的综合指数法评价结果表明，聊城市重金属污染的程度依次为Hg＞Cu＞Cd＞Zn＞Cr＞Pb＞As＞Ni；各元素总体平均变异程度为：Zn> As>Hg>Cr>Ni>Cu>Pb>Cd；土壤各重金属污染分布不尽相同，但总体上区域差异较小。

The Resarch of Heavy Metals Pollution in Soil Based on the Connection of Geoaccumulation Index and Nemero Index

As,Cd,Cr,Cu,Hg,Ni,Pb and Zn in 136 soil samples had been monitored in Liaocheng.A new method which connect geoaccumulation index with Nemero index was used to evaluate the metal pollution.The polluted degree of all heavy metals had been ensured.Then,the Variance in all samples of all heavy metals had been analyzed.At last,ArcGIS8.3 had been used to study the distribution of heavy metals pollution.The result showed that the polluted degree of all heavy metals is different.Its order is：Hg〉Cu〉Cd〉Zn〉,Pb〉As〉Ni.The Coefficient of variation order of all heavy metals is： Zn〉 As〉Hg〉Cr〉Ni〉Cu〉Pb〉Cd. There were not big difficult in different soil samples.