平阴县土壤中重金属元素异常成因研究

通过对平阴县周边及其西部农田区采样调查，平阴县周边元素异常具有异常衬度较高，富集系数大等特征，西部农田区异常具有各元素套合关系好，多数异常衬度不高，富集系数小的特点。结果表明，西部农田区异常是以As，Cd为主要成分的异常，元素含量与SiO2，Al2O3，Fe2O3等常量组分间具有显著的相关性，随SiO2含量的增加而降低，随Al2O3，Fe2O3含量的增加而增加，说明土壤常量组分及其所决定的土壤质地是导致异常形成的主要因素；而平阴城区异常是以S，Hg，As，Zn，Mn等元素为主的异常，是典型的人为综合因素（化工烟尘、工厂污水、生活垃圾）产生的异常。

Study on Origin of Heavy Metals Abnomalities in Soil in Pingyin County

Through survey on samples gained from agricultural soil in surrounding areas and western Pingyin coun- ty, it is regarded that abnormal elements surrounding trast and high enrichment factors, while the elements Pingyin county has the characteristics of high abnormal con- in western agricultural land has the characteristics of abnormal relationship between the nested elements, low abnormal contrast and low enrichment factorsr. As showed by the re- sults, As, Cd are major abnormal elements in western abnormal farmland area. There is a significant relation be- tween elements compontents and constants as SiO2, Al2 O3 and Fe2O3. Elements compontents will descending along with the content increasing of SiO2, while it will increasing with the content increasesing of Al2O3 and Fe2O3. It showed that soil constant component and soil texture are major factors in the formation of abnormality ; while abnormal elements in Pingyin city are mainly composed of S, Hg, As, Zn and Mn. It is a typical abnormality caused by human pollution （chemical smog, factory waste water, solid waste） .