| 南方丘陵区土壤重金属含量、来源及潜在生态风险评价 |
| 摘要点击 2114 全文点击 591 投稿时间：2021-10-22 修订日期：2022-01-31 |
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| 中文关键词 土壤 丘陵区 重金属 源解析 潜在生态风险 |
| 英文关键词 soils hilly area heavy metals source analysis potential ecological risk |
| 作者 | 单位 | E-mail | | 王玉 | 西北师范大学地理与环境科学学院, 兰州 730070
中国地质科学院岩溶地质研究所, 自然资源部/广西岩溶动力学重点实验室, 桂林 541004 | 1422389976@qq.com | | 辛存林 | 西北师范大学地理与环境科学学院, 兰州 730070 | xincunlin@163.com | | 于奭 | 中国地质科学院岩溶地质研究所, 自然资源部/广西岩溶动力学重点实验室, 桂林 541004 | yushihydrogeo@163.com | | 薛红蕾 | 烟台市蓬莱区农业农村局, 烟台 265600 | | | 曾鹏 | 中国地质科学院岩溶地质研究所, 自然资源部/广西岩溶动力学重点实验室, 桂林 541004 | | | 孙平安 | 中国地质科学院岩溶地质研究所, 自然资源部/广西岩溶动力学重点实验室, 桂林 541004 | | | 刘凡 | 中国地质科学院岩溶地质研究所, 自然资源部/广西岩溶动力学重点实验室, 桂林 541004 | |
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| 中文摘要 |
| 为了探究南方丘陵区土壤重金属污染特征及生态风险状况，选择南方某省丘陵区作为研究区，利用2017年采集的60个点位的土壤样品，采用单因子污染指数（Pi）、内梅罗综合污染指数（P综）和潜在生态风险指数（RI）评估As、Cd、Cr、Cu、Hg、Ni、Pb和Zn这8种重金属含量特征和潜在生态风险程度，并利用正定矩阵因子分解模型（PMF）解析其污染来源.结果表明：①研究区8种重金属元素的含量均有超标，内梅罗综合污染指数显示，研究区呈现轻度、中度和重度污染所占的比例分别为63%、8%和2%，无污染和轻微污染的样点占27%，因此基本处于轻度污染；②综合潜在生态风险指数表明，土壤重金属RI为39.58~224.15，低等和中等生态风险的样点所占的比例为73.33%和25%，而重度生态风险的样点所占比例为1.67%，该样点生态风险程度虽然最高，但重金属含量低于该省土壤元素背景值；③通过PMF模型得到6个污染源：自然源、农业活动源、铜矿采选和交通运输组成的混合源、工业活动源、交通源和生活垃圾排放源，贡献率依次为24.8%、17.7%、17.7%、17.6%、12.0%和10.2%. |
| 英文摘要 |
| In order to explore the characteristics of soil heavy metal pollution and ecological risk status in southern hilly areas, a hilly area of a southern province was selected as the research area, using soil samples collected at 60 points in 2017. The single factor pollution index (Pi), Nemero comprehensive pollution index, and potential ecological risk index (RI) were used to evaluate the content characteristics and potential ecological risks of eight heavy metal elements (As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn), and positive definite matrix factor analysis models (PMF) were used to analyze their sources of pollution. The results were as follows:① the content of eight heavy metal elements in the study area exceeded the standard, and the Nemeiro comprehensive pollution index showed that the proportions of light, moderate, and heavy pollution in the study area were 63%, 8%, and 2%, respectively. Unpolluted and lightly polluted samples accounted for 27% and were thus basically lightly polluted. ②The comprehensive potential ecological risk index showed that the RI of soil heavy metals was 39.58-224.15, the proportions of samples with low and medium ecological risks were 73.33% and 25%, respectively, and the proportion of sites with severe ecological risks was 1.67%. Although this site had the highest ecological risk, the content of heavy metals was lower than the background value of soil elements in the province. ③Six pollution sources were obtained through the PMF model:natural sources, agricultural activity sources, mixed sources composed of copper mining and transportation, industrial activity sources, transportation sources, and domestic waste emission sources. The contribution rates of each source were 24.8%, 17.7%, 17.7%, 17.6%, 12.0%, and 10.2%, respectively. |
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