青海省富硒土壤中硒的形态和价态分析

发布时间：2018-06-15 20:29

本文选题：青海省东部 + 富硒土壤　；参考：《江苏农业科学》2017年16期

【摘要】：通过检测分析青海省东部富硒土壤中硒的含量、赋存形态和价态,旨在为正确评价青海省东部土壤的富硒状况,有效利用富硒土壤资源及富硒农产品的开发提供理论依据。结果表明,青海省东部富硒土壤全硒含量变幅为0.342~0.770 mg/kg,平均值为0.487 mg/kg,是我国土壤平均硒含量的1.68倍,远大于全国土壤硒含量的平均值,属于足硒到中等高硒水平。供试土壤中可溶态硒、可交换态及碳酸盐结合态硒和残渣态硒分别占全硒含量的10.91%~21.35%、11.56%~23.52%、11.69%~23.98%,铁锰氧化物结合态硒含量最少,占全硒含量的3.52%~11.82%;而有机结合态硒占土壤全硒含量的比例高达27.49%~50.65%,平均值为36.55%,土壤中硒的赋存形态主要以有机结合态为主。对土壤硒价态的研究表明,可溶态硒和可交换态及碳酸盐结合态硒中均存在Se~(4+)、Se~(6+),不存在Se~(2-),且以Se~(6+)为主要赋存形态。青海省东部富硒土壤分布集中,含量适宜,供硒潜力巨大,具有良好的开发利用前景。
[Abstract]:Based on the analysis of selenium content, occurrence form and valence state of selenium-rich soils in eastern Qinghai Province, this paper aims to provide a theoretical basis for the correct evaluation of selenium-enriched soils and the utilization of selenium-enriched soil resources and selenium-rich agricultural products. The results showed that the range of total selenium content in selenium-enriched soils in eastern Qinghai Province was 0.342U 0.770 mg / kg, with an average of 0.487 mg / kg, which was 1.68 times of the average selenium content in China, and was much larger than the average of the national soil selenium content, which belonged to the level of sufficient selenium to moderate high selenium. Soluble selenium, exchangeable and carbonate bound selenium and residual selenium account for 10.91% of the total selenium content in the tested soil, respectively. The content of iron and manganese oxide bound selenium is the least. 3.52% of the total selenium content was 11.82%, while the proportion of organic-bound selenium to soil total selenium content was as high as 27.49% and 50.65, with an average value of 36.55. The main forms of selenium in the soil were organic bound forms. The study on the valence state of selenium in soil shows that the soluble selenium, the exchangeable selenium and the carbonate bound selenium are all present in Seanzhuan4, Seanzhuan6, and there is no Seanzhuan2 ~ (2), and the main occurrence form is Seanzao (6). The selenium-rich soil in eastern Qinghai Province is concentrated in distribution, suitable in content, and has great potential for selenium supply, and has a good prospect of exploitation and utilization.
【作者单位】：青海大学农牧学院农林系;三江源生态与高原农牧业国家重点实验室;
【基金】：国家自然科学基金(编号:41401354) 青海省自然科学基金(编号:2014-ZJ-928Q)
【分类号】：S153.6

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