| 土壤硒含量影响因素及富硒土地资源区划研究——以湖北恩施沙地为例 |
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| 引用本文： | 曾庆良,余涛,王锐.土壤硒含量影响因素及富硒土地资源区划研究——以湖北恩施沙地为例[J].现代地质,2018,32(1):105. |
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| 作者姓名： | 曾庆良 余涛 王锐 |
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| 作者单位： | (中国地质大学(北京) 地球科学与资源学院，北京100083) |
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| 基金项目： | 中南重点重金属高背景区土地质量地球化学调查(DD20160323)。 |
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| 摘 要： | 硒是人体必需的微量元素之一。为了研究土壤硒含量分布特征及其主要影响因素，并对富硒土地资源进行安全利用区划，本研究在恩施市沙地乡系统地采集并分析化验了199件表层土壤样，60件农作物样。分析了玉米籽实及对应的表层土壤中硒含量等地球化学参数的相关性，建立了玉米籽实硒元素吸收模型。结果表明：研究区表层土壤硒含量变化范围为019~1557 mg·kg-1，算术平均值为188 mg·kg-1，远超过湖北省及全国表层土壤硒含量水平，足硒、富硒土壤面积占研究区总面积的8443%；表层土壤硒含量分布受控于地质背景，不同地质背景的表层土壤硒含量分布存在较大差异，二叠系茅口组地层表层土壤硒含量显著高于其他地层分布区域；土壤有机碳含量及海拔高度是影响研究区表层土壤硒含量的重要因素；农作物硒含量变化范围较大，其中处于富硒水平的农作物所占比例最大，为4322%；研究区富硒土地面积和潜在富硒土地面积分别占研究区总面积的6533%和2312%。
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| 关 键 词： | 硒 影响因素 模型 富硒土壤 湖北恩施 |
The Influencing Factors of Selenium in Soils and Classifying the Selenium-rich Soil Resources in the Typical Area of Enshi,Hubei |
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| ZENG Qingliang,YU Tao,WANG Rui.The Influencing Factors of Selenium in Soils and Classifying the Selenium-rich Soil Resources in the Typical Area of Enshi,Hubei[J].Geoscience——Journal of Graduate School,China University of Geosciences,2018,32(1):105. |
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| Authors: | ZENG Qingliang YU Tao WANG Rui |
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| Institution: | School of Earth Sciences and Resources, China University of Geosciences, Beijing100083,China |
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| Abstract: | Selenium is an essential element for mammals. In order to study the distribution characteristics, the important influencing factors of selenium distribution in soils and to classify selenium rich soil resources, this study systematically collected and analyzed 199 top soil samples and 60 crop samples in Shadi township of Enshi City. The correlation of the geochemical parameters, such as the selenium concentrations of corn seeds and top soils, was analyzed, and as a result an absorption model of selenium in corn seeds was established. Results of the analysis show that concentrations of total selenium in the top soils ranged from 019 mg·kg-1 to 1557 mg·kg-1, and averaged 188 mg·kg-1, which is clearly higher than the average concentrations in Hubei Pro vince and China as a whole. The area with selenium sufficient soil and selenium rich soil accounts for 8443% of the study area. The distribution of selenium is mainly influenced by geology. There is a significant difference in selenium content distribution in top soils formed in proximity to different geologies. The selenium content in the outcropping area of Permian Maokou Formation is higher than that of other stratigraphic regions. The results also indicate that soil TOC and altitude were important influencing factors on selenium content. The selenium concentrations in crops had a large range. Se enriched crops have the largest proportions, accounting for 4322%. The selenium rich land and potentially selenium rich land accounted for 6533% and 2312% of the study area, respectively. |
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| Keywords: | selenium influencing factor model selenium rich soil Enshi Hubei |
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