广西永福县表层土壤硒地球化学特征及其影响因素分析

Geochemical Characteristics and Influencing Factors of Selenium in Surface Soil of Yongfu County,Guangxi

为了给广西永福县发展硒产业提供地质依据,通过对农用地土壤硒含量的调查,研究了土壤硒分布特征及其影响因素。研究结果表明,土壤硒含量为(0.15~8.73)×10^(-6),平均值为0.65×10^(-6),区内存在大面积富硒土壤,具备开发天然富硒农产品的条件。硒在本区分布不均匀,受地质背景控制,不同地层单元表层土壤硒含量分布差异大;其中,石炭系鹿寨组(C1lz)表层土壤硒含量最高,达到1.01×10^(-6),富集作用与其黑色岩系密切相关;此外,地形地貌、土壤类型、土壤pH和土地利用方式对土壤硒含量的分布与富集也有一定的影响作用。

In order to provide geological basis for the development of selenium-rich industry in Yongfu County,Guangxi,the distribution characteristics of soil selenium and its influencing factors were studied through the investigation of soil selenium content in agricultural land.The results showed that the soil selenium content was(0.15~8.73)×10^(-6),with an average of 0.65×10^(-6).There was a large area of selenium-rich soil in the area,which had the conditions for the development of natural selenium-rich agricultural products.The distribution of selenium in this area is uneven.Controlled by geological background,the distribution of selenium content in surface soil of different stratigraphic units is different.Among them,the selenium content in the surface soil of the Carboniferous Luzhai Formation(C1lz)is the highest,reaching 1.01×10^(-6).The enrichment is closely related to the black rock series.In addition,topography,soil type,soil pH and land use pattern also have certain effects on the distribution and enrichment of soil selenium content.