辽宁省土壤背景点位重金属垂直分布特征与变化规律分析

为了解辽宁省土壤背景点位近30年来土壤重金属变化情况,对辽宁省土壤背景点位开展调查,基本掌握了61种无机元素含量状况及分布特征,分析了8种重金属背景值含量变化。结果表明,辽宁省土壤重金属背景值水平垂直分布规律为自上而下逐渐降低,与辽宁省“七五”时期调查相比,镉、汞、砷、铅、铬、铜、锌、镍等8种重金属含量均有所上升,主要为背景点位及点位周边土地利用方式的变化所致。

In order to understand the changes of heavy metals in soil background sites in Liaoning Province in the past 30 years,the soil background sites in Liaoning Province were investigated,the content and distribution characteristics of 61 inorganic elements were basically mastered,and the content changes of 8 heavy metals were analyzed.The results show that,the horizontal and vertical distribution law of soil heavy metal background value in Liaoning Province is gradually decreasing from top to bottom,and compared with the survey during the“7^(th) Five-year plan”period in Liaoning Province,the contents of eight heavy metals such as Cd,Hg,As,Pb,Cr,Cu,Zn and Ni all have increased,which was mainly caused by the change in the land use mode of the background and surrounding points.