黄河下游滩区原阳段硒元素分布特征

Distribution Characteristics of Soil Selenium in Yuanyang Section of Floodplain Area in Lower Yellow River

硒元素作为人体必需的微量营养元素之一,与人体健康密切相关。选取黄河下游滩区原阳段为研究区,通过采样分析获得该区表层及深层硒元素及镉、汞、铅、砷、铜、铬元素的含量,并对硒元素进行质量评价,结果表明:研究区表层土壤硒含量为0.022~1.232 mg/kg,平均值为0.448 mg/kg,深层土壤硒含量为0.081~2.570 mg/kg,平均值为0.945 mg/kg,总体上属于中等及高硒土壤;缺硒区域主要分布在研究区西部,硒含量较高区域则主要集中在研究区中部,且表层和深层硒元素分布范围一致;研究区硒含量主要受成土母质、土壤pH值和有机质含量的影响;研究区镉、汞、铅、砷、铜、铬元素含量较低,土壤环境质量整体良好。

Selenium,as one of the essential micronutrients is closely related to human health.In this paper,the contents of selenium and cad⁃mium,mercury,lead,arsenic,copper and chromium in the surface and deep layers of Yuanyang section in the floodplain area of the Lower Yellow River were obtained by sampling and analysis and the quality of selenium was evaluated.The results show that the selenium content in surface soil is 0.022-1.232 mg/kg and the average is 0.448 mg/kg,the selenium content in deep soil is 0.081-2.570 mg/kg and the average is 0.945 mg/kg.Generally,it belongs to medium and high selenium soil.Selenium deficient areas are mainly distributed in the west part of the studied area,while the areas with higher selenium content are mainly concentrated in the middle part and the distribution range of seleni⁃um in the surface and deep layers is consistent.The selenium content is mainly affected by soil parent material,pH and the organic matter.In addition,the contents of cadmium,mercury,lead,arsenic,copper and chromium are relatively lower and the soil environmental quality is good as a whole.