辽宁丹东地区土壤Se元素地球化学特征及其影响因素

doi:10.13278/j.cnki.jjuese.20190204

摘要/Abstract

摘要： 以辽宁省丹东市富硒（Se）土壤为研究对象，依据表层土壤、土壤剖面及成土母岩的调查数据，研究了土壤中Se元素质量分数、分布规律及其影响因素。结果表明：研究区表层土壤中Se质量分数变化范围为（0.028~0.910）×10^-6，高于全国土壤Se质量分数平均值；Se元素空间分布受辽河群影响，显示出表层富集特征。研究区土壤中Se元素富集主要有以下原因：Se元素来源于盖县岩组和高家峪岩组变质岩，其富集受成土过程影响较大，棕壤土层中黏粒或铁氧化物等聚集，易与Se结合发生聚集；区内表生环境地球化学作用对表层土壤中Se元素起到一定的富集作用，土壤中S、N与Se相互吸附固定，有利于土壤Se的富集，此外Al、Fe氧化物对Se具有很强的吸附能力；研究区土壤中Se质量分数与pH值具有显著的负相关关系，土壤中pH值越小，Se质量分数越高。总体上，研究区土壤硒质量分数与有机碳、铝铁氧化物、S、N质量分数具有较好的相关性，这与广州、江西丰城、湖北恩施等地开展的富硒研究相一致。

关键词: 土壤, Se, 地球化学特征, 辽宁丹东地区

Abstract: The content, distribution regular and enrichment mechanism of Se in the soil of Dandong area (Liaoning Province) were discussed based on the survey data of the surface soil, soil profiles,and pedogenic rocks. The results show that the content of Se in the surface soil in the study area ranges from 0.028×10^-6 to 0.910×10^-6, which is higher than the national Se average in soil. The spatial distribution of Se is affected by the strata of Liaohe Group, showing the characteristics of surficial enrichment. The Se enrichment mechanism in the soil is the following:Se derived from the metamorphic rocks of Gaixian Formation and Gaojiayu Formation, gathered and affected by the process of soil formation, in which the clay particles or iron oxides aggregated in the brown loam layer and combined with selenium; The environmental geochemistry played a certain role in the enrichment of selenium in the surface soil, and the S, N and Se in soil adsorbed and fixed with each other, which was conducive to Se enrichment in soil;In addition, Al and Fe oxides had a strong adsorption capacity to Se; A significant negative correlation occurs between Se and pH in the soil in the study area, implying the low pH value in the soil accompanied by high Se content. In general, the content of Se in soil in the study area shows obviously positive relationship with organic matter, Fe-Al oxides, S and N, which is consistent with the research results of Se in Guangzhou, Fengcheng,and Enshi.

Key words: soil, selenium, geochemical charactertics, Dandong area, Liaoning

中图分类号:

P595

李玉超, 王诚煜, 于成广. 辽宁丹东地区土壤Se元素地球化学特征及其影响因素[J]. 吉林大学学报(地球科学版), 2020, 50(6): 1766-1775.

Li Yuchao, Wang Chengyu, Yu Chengguang. Geochemical Characteristics and Influencing Factors of Selenium in Soil from Dandong Area, Liaoning Province[J]. Journal of Jilin University(Earth Science Edition), 2020, 50(6): 1766-1775.

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