云南省安宁地区土壤重金属等元素生态地球化学调查与评价  

Eco-geochemical survey and evaluation of heavy metals and other elements in soil in Anning City,Yunnan Province

作　　者：范晨子[1,2] 袁继海[1,2] 刘成海 郭威 孙冬阳[1,2] 刘崴[1,2] 赵九江[1,2] 胡俊栋[1,2] 赵令浩 FAN Chen-Zi;YUAN Ji-Hai;LIU Cheng-Hai;GUO Wei;SUN Dong-Yang;LIU Wei;ZHAO Jiu-Jiang;HU Jun-Dong;ZHAO Ling-Hao(National Geological Experiment and Testing Center,Beijing 100037,China;Key Laboratory of Micro-and Element Forms Analysis of China Geological Survey,Beijing 100037,China)

机构地区：[1]国家地质实验测试中心,北京100037 [2]中国地质调查局微区与元素形态重点实验室,北京100037

出　　处：《物探与化探》2022年第3期761-771,共11页Geophysical and Geochemical Exploration

基　　金：中国地质调查局地质调查项目(DD20190589);国家重点研发计划项目(2019YFC1805005);中国地质科学院基本科研业务费项目(CSJ201903、CSJ202014);国家地质实验测试中心大型科研仪器开放共享后补助资金项目(GXBZ-2021-01)。

摘　　要：云南省安宁市是长江上游滇中经济发展和生态文明建设的重要地区。本文以2018~2020年度在安宁地区系统采集的表层土壤样品为研究对象,对研究区表层土壤重金属等元素含量特征和富集程度进行研究,利用地累积指数和潜在生态风险评价指数对土壤重金属的生态风险进行评价,并采用相关性和主成分分析其来源。结果表明,研究区土壤重金属Cr、Zn、As、Cd、Pb、Hg以及放射性元素U显著高于云南省土壤背景值,且变异程度较高,空间分布不均;重金属Cr地质异常累积程度最高,As、Cd和Hg潜在生态风险等级高,生态风险主要集中在磷矿采区及螳螂川流域钢铁厂、化工厂周边。研究区土壤中Cr、Ni、Cu可能更多地来源于成土母质;Cd、Pb、Zn和As高含量区受人为活动的影响较为显著;Hg可能存在复合污染源。本研究结果将为识别安宁地区土壤重金属的来源及当地土地资源安全管护提供科学依据。Anning City,Yunnan Province,China is an important area of economic development and ecological civilization construction in central Yunnan on the upper reaches of the Yangtze River.This study investigated the contents and enrichment degrees of elements including heavy metals in the surface soil samples that were systematically collected in the Anning area from 2018 to 2020.Then,this study assessed the ecological risks of heavy metals in the soil using the geoaccumulation index and the assessment indices of potential ecological risks and analyzed the sources of heavy metals using the methods of the Pearson correlation and principal component analysis.The results show that heavy metals Cr,Zn,As,Cd,Pb,Hg,and radioactive element U in the soil in the study area have significantly higher contents than corresponding background values of soil in Yunnan Province and show high-degree variation and uneven spatial distribution.Moreover,Cr has the highest accumulation degree of geological anomalies,elements As,Cd,and Hg have high potential ecological risks,and ecological risks are mainly concentrated in the phosphate mining area and the vicinity of steel plants and chemical plants in the Tanglangchuan basin.In terms of sources,Cr,Ni,and Cu may mainly originate from soil parent materials;areas with high Cd,Pb,Zn,and As contents are significantly affected by human activities,and Hg may have a composite pollution source.These results will provide a scientific basis for understanding the sources of heavy metals in soil in Anning City and for the management and protection of local land resources.

关 键 词：云南安宁 土壤 重金属 生态地球化学 

分 类 号：P632[天文地球—地质矿产勘探]