Study on the Distribution of Selenium-rich Soil and the Regularity of Selenium Enrichment-Migration in Shitai Area, Anhui, China
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摘要: 安徽省南部石台县是潜在的富硒地区，调查该区富硒土壤分布特征并研究Se元素的富集迁移规律，对该区富硒农产品开发具有重要意义。笔者采用元素分析等技术对石台地区富硒土壤分布特征及Se的富集迁移规律进行研究。结果表明，石台地区表层土壤Se含量平均值为0.56 mg/kg，明显高于土壤富硒标准（0.4 mg/kg）。石台县硒含量分布较不均匀，其中均值达到富硒标准的乡镇有5个：仙寓镇、大演乡、小河镇、丁香镇及仁里镇。该区高Se区主要集中于寒武系荷塘组和黄柏岭组，尤其是石煤层出露区域，指示这些地层为石台地区土壤Se的主要来源。土壤中Se含量与pH值、C、S及有机质含量有很好的相关性，表明土壤成分和性质对土壤中Se的迁移分布具有重要作用。石台地区局部富Se地层（尤其是寒武系黄柏岭组）同时也富集Cd、Hg等重金属元素，导致地层周边土壤富Se的同时还遭受重金属污染。该区发展富硒农业时应避开这些高重金属含量的区域。Abstract: Shitai County in the southern Anhui Province is a potential Selenium (Se)-rich area. Investigating the distribution characteristics of Se-rich soil and studying the regularity of Se enrichment-migration are of great significance for the development of Se-rich agricultural products in this area. In this study, the distribution characteristics of Se-rich soil and the regularity of selenium enrichment and migration in the Shitai area were studied using elemental analysis techniques. Our results show that the average Se contents in the surface soils of the Shitai area are 0.56 mg/kg, which are significantly higher than the threshold value (0.4 mg/kg) of Se enrichment in soil. The distribution of Se contents in the Shitai area is not uniform, and the average soil Se contents of five towns in Shita have reached the standard Se-enrichment, i.e., Xianyu town, Dayan township, Xiaohe town, Dingxiang town, and Renli town. High-Se areas in Shitai are mainly concentrated in the areas where the Cambrian Hetang and Huangboling formation strata, especially the stone coal stratum are exposed. This indicates that these strata are the main sources of Se in the soil of the Shitai area. There are good correlations between soil selenium contents and pH values, and the contents of carbon, sulfur, and organic matter, indicating that the composition and property of soil play an important role in the migration and distribution of Se. Local Se-rich strata (especially the Cambrian Huangboling formation) in the Shitai area are also rich in heavy metals such as Cd and Hg, resulting in both selenium enrichment and heavy-metal pollution in surrounding soils. These areas with high heavy metal contents should be avoided when developing Se-rich agriculture in the Shitai area.
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Key words:
- Shitai /
- Se-rich soil /
- distribution regularity /
- geochemistry
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