The distribution of soil selenium in Shouning County of Fujian Province and its influencing factors
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摘要:
通过福建省寿宁县多目标区域地球化学调查，查明了土壤硒分布和富集特征，研究了土壤硒与pH值及其他元素的相关关系。结果表明，表层土壤硒含量为0.13~0.92 mg/kg，平均值为0.35 mg/kg，深层土壤硒含量为0.14~0.54mg/kg，平均值为0.29 mg/kg，燕山晚期正常花岗岩（ξγK1）发育的土壤中硒含量最高，平均值为0.39mg/kg，其次为南园组四段（J3n4）和小溪组上段（K1x2）发育的土壤，不同土壤类型硒平均含量呈现出黄壤>红壤>水稻土的特点。表层土壤总体上属于富硒、足硒土壤，富硒土壤面积为405.04 km2，占28.24%，表层土壤硒含量相对于深层土壤表现出明显的富集特征，强烈富集区域与富硒土壤区域基本吻合，具有开发富硒农产品的潜力。相关分析表明，土壤硒含量与TOC、Al2O3、TFe2O3、Mn等呈显著正相关，与pH呈显著负相关，说明土壤理化性质、铁锰氧化物等对硒的表生地球化学行为有重要影响。
Abstract:Based on multi-purpose regional geochemical survey in Shouning County of Fujian Province, the authors found the characteristics of selenium distribution and enrichment and the correlation between selenium and pH as well as other elements. The results show that the selenium content in surface soil is from 0.13 mg/kg to 0.92 mg/kg, with the average value of 0.35 mg/kg. The total selenium content in deep soil is from 0.14 mg/kg to 0.54 mg/kg, with the average value of 0.29 mg/kg. The selenium content in the soil developed in late Yanshanian normal granite is the highest, with an average value of 0.39 mg/kg, followed by the soil developed in 4th member of the Nanyuan Formation and the upper part of the Xiaoxi Formation. The selenium content of different soil types shows that the content of yellow soil is higher than that of red soil, and that of red soil is higher than that of paddy soil. The surface soil generally belongs to selenium-rich and selenium-sufficient soil, the area of selenium-rich soil contains 405.04km2, accounting for 28.24%. The selenium content in the surface soil demonstrates an apparent feature of enrichment relative to the content in the deep soil, with the strong enrichment area basically consistent with the area of selenium-rich soil with the potential of developing selenium-rich agricultural products. The correlation analysis indicates that the selenium content in soil has a significant positive correlation with organic carbon, aluminum oxide, total iron oxide and manganese, and has a negative correlation significantly with pH, indicating that soil physical and chemical properties, iron and manganese oxides in the soil play important roles in the geochemical behaviors of selenium.
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表 2 寿宁县表层土壤和深层土壤硒元素(mg/kg)地球化学参数
Table 2. Geochemical parameter of selenium(mg/kg) in surface soil and deep soil, Shouning
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表 3 不同地质背景下表层土壤硒含量（mg/kg）特征
Table 3. Selenium content (mg/kg) in different geological backgrounds
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表 5 表层土壤和深层土壤硒丰缺划分结果
Table 5. Abundance and deficiency of selenium in surface soil and deep soil
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表 6 土壤硒表层生富集系数分类及富集面积
Table 6. Classification of supergene concentration coefficients of soil selenium and area of each grade
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表 7 寿宁县表层土壤中全硒含量与其他元素含量的相关性
Table 7. Correlation coefficients between selenium and other indicators in the surface soils of Shouning
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