| 肖高强.云南典型地质高背景区土壤重金属含量特征
及污染风险评价[J].地质与勘探,2021,57(5):1077-1086 |
| 云南典型地质高背景区土壤重金属含量特征
及污染风险评价 |
| Content characteristics and risk assessment of heavy metals in soil of typical high geological background areas, Yunnan Province |
| 投稿时间：2020-12-30 修订日期：2021-06-15 |
| DOI：10.12134/j.dzykt.2021.05.012 |
| 中文关键词: 土壤重金属 污染风险评价 地质高背景 玄武岩 飞仙关组 |
| 英文关键词: heavy metals in soil, pollution risk assessment, high geological background, basalts, Feixianguan Formation |
| 基金项目:中国地质调查局地质项目（编号：DD20160313）资助 |
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| 中文摘要: |
| 云南峨眉山玄武岩和碳酸盐岩分布区为典型重金属地质高背景区，选取云南鲁甸县典型地质高背景区为研究对象，采集1406件表层土壤样品，系统研究土壤中重金属含量特征，评价土壤重金属污染风险，重点探讨不同地质岩性对土壤重金属含量的影响，分析土壤重金属的来源。结果表明：①表层土壤中Cu、Cr、Cd、Zn和Ni含量均超出云南省背景值，土壤重金属含量明显受成土母质影响，碳酸盐岩明显富集Cd、Cr、Cu、Hg、Ni、Pb、Zn，飞仙关组碎屑岩明显富集Cr、Cu、Ni、Cd，玄武岩明显富集Cu、Cd、Zn、Cr，均为典型的地质高背景区；②表层土壤重金属综合评价等级以风险可控为主，碳酸盐岩、飞仙关组碎屑岩和玄武岩土壤中污染风险较高的重金属元素主要为Cd、Cu、Cr、Ni，且明显受玄武岩岩浆活动影响；③主成分和空间分析结果显示，地质高背景区土壤重金属高含量主要为成土母岩中重金属高含量及其风化成土过程中次生富集作用导致，人为影响相对较小。 |
| 英文摘要: |
| The distribution areas of Emeishan basalt and carbonate rock are typical high geological background areas of heavy metals in Yunnan Province. In this work, 1406 topsoil samples were collected from such areas in Ludian County, Yunnan Province. A systematic study was made on the content characteristics and risk assessment of heavy metals in soil, focusing on the effects of different geological lithology on the content of heavy metals in soil and analysis on their sources. The results show that ①the contents of Cu, Cr, Cd, Zn and Ni in topsoil of the study area are obviously affected by pedogenic parent material, which all exceed the background values of heavy metals in Yunnan Province. The soils formed by carbonate rocks are obviously enriched in Cd, Cr, Cu, Hg, Ni, Pb and Zn, those formed by clastic rocks of Feixianguan formation are obviously enriched in Cr, Cu, Ni and Cd, and formed by basalts are obviously enriched in Cu, Cd, Zn and Cr, which are typical high geological background areas of heavy metals. ②The level of overall risk assessment of heavy metal pollution in topsoil is mainly controllable. The heavy metals with high pollution risk in soils formed by carbonate rock, clastic rocks of Feixianguan Formation and basalt are mainly Cd, Cu, Cr and Ni, obviously affected by basalt magmatic activity. ③From principal component and spatial analyses, the high content of heavy metals in soil of high geological background areas soil are caused by the high content of heavy metals in pedogenic parent materials or the secondary enrichment in the process of weathering and pedogenesis, while the anthropogenic influence is relatively little. |
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