Geochemical characteristics and bioavailability of selenium in alkaline soil in Shizuishan area, Ningxia
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摘要: 以石嘴山地区碱性土壤为研究对象,全面采集了石嘴山地区表层土壤样品,分析了土壤中硒及有效硒等地球化学指标。结果表明:研究区土壤硒的主要来源为贺兰山区黑色岩系,其次为引黄灌溉淤积;研究区硒的生物有效性处于较高水平,有效硒富集及以上的区域占全区的79.2%,面积约为777.2 km2;硒不同形态含量依次为残渣态>强有机结合态>腐殖酸结合态>离子交换态≈水溶态>碳酸盐结合态≈铁锰氧化物结合态,全硒含量有限但水溶态硒含量较高;土壤全氮及有机质含量越高,土壤全硒及有效态硒的含量越高;随着研究区土壤含盐量升高,硒活化度呈现逐步升高的趋势; pH值在7.5~9之间的灌淤土及潮土全硒含量适中,有效硒含量较高,是种植富硒农产品的优质选区。Abstract: Based on the comprehensive collection of samples from the alkaline soil in the Shizuishan area, Ningxia, this study analyzes the geochemical indicators of selenium and available selenium in soil in the area.The results are as follows. The seleniumin soil in the study area is mainly originated from the black rock series in the Helan Mountain area, followed by siltation brought in by the agricultural irrigation water diverted from the Yellow River. The bioavailability of selenium in the study area is at a relatively high level, and the effective selenium enrichment and above covers 79.2% of the whole study area, with an area of about 777.2 km2. The content of different forms of selenium is in the order ofresidualselenium>strongly organic matter-bound selenium>humic acid-bound selenium>ion exchangeableselenium≈water-soluble selenium > carbonate-bound selenium≈iron manganese oxide-boundselenium. The total selenium content is limited, while thewater-soluble selenium content is relatively high. The higher the total nitrogen and organic matter content in soil, the higher the total selenium and available selenium content. As the salt content in soil in the study area increases, the bioavailability of seleniumtends to gradually increase. The irrigation-silted soiland thefluvo-aquic soil with a pH value between 7.5 and 9 have moderate total selenium content and high available selenium content, and they are high-quality areas for planting selenium-rich agricultural products.
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Key words:
- alkaline soil /
- geochemical characteristics /
- available selenium /
- selenium form /
- Shizuishan
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