吉林黑土区土壤-作物系统重金属元素地球化学特征研究

Geochemical Characteristics of Heavy Metal Element of Soil-Plant System in Black Soil Region in Jilin

在吉林中部系统的野外调查和土壤及玉米籽实样品采集、测试的基础上,采用统计对比及相关分析方法研究了土壤重金属元素含量、有效态含量及玉米籽实重金属元素含量的空间分异,并对土壤-作物系统重金属污染状况进行了评价,目的在于为这一重要粮食产区的环境保护提供科学的依据。结果表明:土壤重金属元素含量、有效态含量及玉米籽实中重金属元素含量在不同研究区存在差异;研究区没有As、Cr、Cu、Ni、Zn元素的外来污染源;Cd元素的表层富集趋势可能是使用化肥所致;吉林黑土区土壤环境质量非常好,处于Ⅰ级水平,十分安全。

Based on systematic field investigations and sample collection and test of soil and maize seeds in black soil region in central Jilin, by using methods of statistical comparison and correlation analysis, studied were made on the spatial differences of heavy metal content in soil, available content in soil and heavy metal content in maize seeds. At the same time heavy metal pollution in soil - plant system were evaluated. The aim of the research is to provide scientific basis for environmental protection in the important grain producing area. The results show that heavy metal content in soil, available content in soil and heavy metal content in maize seeds are different in different research areas; There are no external pollution sources of As,Cr ,Cu ,Ni,Zn elements; The surface enrichment trend of Cdelement may be caused by the use of pesticide; The soil environmental quality is very good in black soil region in central Jilin, which is very safe and of the first level.