| 莱州湾南岸不同土地利用类型土壤重金属分布特征、污染评价和源解析 |
| 摘要点击 1276 全文点击 199 投稿时间：2023-12-25 修订日期：2024-03-14 |
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| 中文关键词 重金属 土地利用类型 空间分布 污染评价 源解析 |
| 英文关键词 heavy metals land uses spatial distribution pollution assessment source analysis |
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| 中文摘要 |
| 为查明莱州湾南岸表层土壤重金属污染现状,在研究区7种不同土地利用类型中采集263件表层土壤样品,测定８种土壤重金属（As、Cr、Ni、Cu、Zn、Cd、Pb和Hg）的含量和pH值,通过地累积指数法、内梅罗综合指数法和潜在生态风险指数法开展污染评价,结合相关性分析探讨重金属污染来源,采用正定矩阵因子分解法（PMF）进行来源解析. 结果表明,研究区表层土壤呈弱碱性,As、Ni、Zn和Hg略超过潍坊市土壤背景值,重金属空间分布整体上呈北低南高的趋势. 地累积指数表明,研究区属于无污染,地累积指数大小为：As>Ni>Zn>Cr>Pb>Hg>Cu>Cd. 内梅罗综合污染指数表明,研究区属于轻度污染,内梅罗综合污染指数大小为：城镇>草地>林地>农业土地>菜地>工业土地>滩涂. 潜在生态风险指数表明,研究区属于低生态风险,潜在生态风险指数为：农业土地>城镇>林地>草地>菜地>工业土地>滩涂. PMF分析结果显示研究区重金属污染来源主要包括自然源、交通源、农业源和工业源,其贡献率分别是38.06%、26.38%、26.21%和9.35%. |
| 英文摘要 |
| To ascertain the status of the surface soil heavy metal pollution in the southern area of Laizhou Bay, 263 surface soil samples were collected from seven different land use types in the study area and the contents and pH of eight soil heavy metals （As, Cr, Ni, Cu, Zn, Cd, Pb, and Hg） were determined. The pollution assessment was carried out using the geo-accumulation index method, Nemerow comprehensive index method, and potential ecological risk index method. Then, the source of heavy metal pollution was discussed using correlation analysis and the source analysis was carried out through positive matrix factorization （PMF）. The results showed that the surface soil in the study area was weakly alkaline； As, Ni, Zn, and Hg slightly exceeded the background values of Weifang and the spatial distribution of heavy metals showed a trend of low in the north and high in the south. The results of the geo-accumulation index indicated that the study area was pollution free and the geo-accumulation index of different land types was arranged in the order of As>Ni>Zn>Cr>Pb>Hg>Cu>Cd. The results of the Nemerow comprehensive pollution index indicated that the study area was lightly polluted and the Nemerow comprehensive pollution index of different land types was arranged in the order of town>grassland>forest>agricultural land>vegetable land>industrial land>mudflat. The results of the potential ecological risk index indicated that the study area belonged to low ecological risk and the potential ecological risk index of different land types was arranged in the order of agricultural land>town>forest land>grassland>vegetable land>industrial land>mudflat. The results of PMF analysis indicated that the heavy metal pollution sources in the study area mainly included natural sources, transportation sources, agricultural sources, and industrial sources, with contribution rates of 38.06%, 26.38%, 26.21%, and 9.35%, respectively. |
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