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恩施典型富硒区土壤硒与其他元素组合特征及来源分析
余 涛1, 杨忠芳2, 王 锐2, 曾庆良2, 侯宛苓2
1.中国地质大学(北京)数理学院;2.中国地质大学(北京)地球科学与资源学院
摘要:
硒是重要的人体和动物必需微量元素之一,在功能农业发展中起着重要的作用。为了研究高硒土壤中硒与其他元素组合特征及来源,从而支撑富硒资源的安全有效利用,本研究在恩施市沙地乡系统采集并分析了200个表层土壤样和2组土壤垂向剖面样品,运用统计学工具进行了聚类分析和因子分析。结果表明:研究区表层土壤硒含量平均值为1.88 mg/kg ± 2.51 mg/kg,明显高于全国表层土壤硒含量平均值。研究区土壤元素组合特征可分为三类,第一类中硒与钼、钒、铬、镉和镍等元素具有较强的伴生关系,与黑色岩系分布密切相关;第二类为三氧化二铝、铅和砷等元素/氧化物,与土壤中黏土矿物有关;第三类为钙和锶等元素,表明该同族元素的地球化学性质具有相似性。因子分析结果进一步证实了土壤硒和镉伴生主要发生在黑色岩系,不同成土母质硒等元素差异较大。
关键词:    元素组合  来源  因子分析
DOI:10.13758/j.cnki.tr.2018.06.009
分类号:P595;X142
基金项目:国家重点研发计划项目(2017YFD0800304)和中国地质调查局项目(DD20160323)资助。
Characteristics and Sources of Soil Selenium and Other Elements in Typical High Selenium Soil Area of Enshi
YU Tao11, YANG Zhongfang2, WANG Rui2, ZENG Qingliang2, HOU Wanling2
1.School of Science, China University of Geosciences;2.School of Earth Science and Resources, China University of Geosciences
Abstract:
Selenium is one of the important trace elements in humans and animals and plays an important role in the development of functional agriculture. In order to study the combination characteristics and sources of selenium and other elements in high selenium soils to support the safe and effective utilization of selenium-enriched land resources, two hundred topsoil samples and two sets of vertical soil profile samples were collected and analyzed in Shadi Town, Enshi. The topsoil data were interpreted by cluster analysis and factor analysis using statistical tools. The results showed that the arithmetic mean value of selenium content in the topsoil of the study area was 1.88 mg/kg ± 2.51 mg/kg, which was significantly higher than that in the topsoil of the country. Soil element combinations in the study area can be divided into three categories, in the first type, selenium, molybdenum, vanadium, chromium, cadmium, nickel and other elements had strong relationships, and are closely related to the distribution of black rock series; the second type included aluminum oxide, lead and arsenic, which were related to clay minerals in the soil; the third type included calcium and strontium, indicating that the geochemical properties of the same group elements were close to each other. The results of factor analysis further confirmed that the black rock series were the main source of selenium and cadmium in the soil. The differences of element concentrations in various soil parent materials were significant.
Key words:  Selenium  Element combination  Source  Factor analysis

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