高级检索
    赵岩, 郭常来, 崔健, 张艳飞, 李莹, 李旭光, 于慧明. 辽宁省锦州市北镇农业区土壤重金属分布特征、生态风险评价及源解析[J]. 中国地质. DOI: 10.12029/gc20220829001
    引用本文: 赵岩, 郭常来, 崔健, 张艳飞, 李莹, 李旭光, 于慧明. 辽宁省锦州市北镇农业区土壤重金属分布特征、生态风险评价及源解析[J]. 中国地质. DOI: 10.12029/gc20220829001
    ZHAO Yan, GUO Changlai, CUI Jian, ZHANG Yanfei, LI Ying, LI Xu Guang, YU Huiming. Distribution characteristics, ecological risk assessment and source analysis of heavy metals in soil of Beizhen agricultural area, Jinzhou City, Liao Province[J]. GEOLOGY IN CHINA. DOI: 10.12029/gc20220829001
    Citation: ZHAO Yan, GUO Changlai, CUI Jian, ZHANG Yanfei, LI Ying, LI Xu Guang, YU Huiming. Distribution characteristics, ecological risk assessment and source analysis of heavy metals in soil of Beizhen agricultural area, Jinzhou City, Liao Province[J]. GEOLOGY IN CHINA. DOI: 10.12029/gc20220829001

    辽宁省锦州市北镇农业区土壤重金属分布特征、生态风险评价及源解析

    Distribution characteristics, ecological risk assessment and source analysis of heavy metals in soil of Beizhen agricultural area, Jinzhou City, Liao Province

    • 摘要:研究目的】查明重金属分布特征,为当地特色农业开发、全域旅游和土壤重金属污染管控提供科学依据。【研究方法】通过地质调查查明成土母质,采集表层土壤样品,以元素含量分布特征、富集程度为基础,开展土壤环境质量评价,利用地累积指数法进行重金属污染程度评价,使用Hakanson生态风险指数法识别研究区潜在生态风险程度,并进一步通过Pearson相关性分析和聚类分析,定量分析不同重金属主要来源。【研究结果】结果表明,北镇农业区土壤中Cr和Pb的均值低于辽宁省辽河流域背景值,表层土壤重金属富集程度由大到小排序为Hg>As>Cd>Pb>Zn>Cu>Cr>Ni。研究区土壤质量总体良好,在超标样品中Cd、Cu和Zn含量超过风险筛选值的占比分别为45.56%、29.11%和11.47%,占总超标数的86.12%; As和Cd为轻度污染状态,大部分土壤样品的重金属为无~轻度的污染状态,仅Hg元素个别采样点位为强~极强污染。单指标潜在生态风险由高到低排序为: Hg>Cd>As>Cu>Ni>Pb>Cr>Zn,土壤潜在生态风险综合指数RI分布范围为29.7~2358.16,平均值为141.9,以低度风险为主,其次中度风险。相关性分析和聚类分析结果表明,Ni、Cr、As、Pb主要受母岩自然风化影响,Cu、Zn、Cd、Hg受农业生产、工业生产、交通运输,甚至建筑活动等多种来源影响。【结论】农用物质的不合理施用、大气沉降、工业生产、生活垃圾和煤炭燃烧等产生的物质在土壤中富集可能对研究区生态环境质量造成污染风险,未来需要加强对Hg、Cd、Cu和Zn元素在不同地块中富集趋势监测和研究。

       

      Abstract: Objective Find out the distribution characteristics of heavy metals and provide scientific basis for local characteristic agricultural development, global tourism and soil heavy metal pollution control.Method Through Geological Investigation, soil parent material is identified, topsoil samples are collected, soil environmental quality evaluation was carried out on the basis of the distribution characteristics and enrichment degree of element content, the degree of heavy metal pollution was evaluated by using the ground accumulation index method., the Hakanson ecological risk index method was used to identify the degree of potential ecological risk in the study area, and further by pearson correlation analysis and cluster analysis to quantitatively determining main sources of different heavy metals.Results The results showed that the average value of Cr and Pb in the soil of Beizhen agricultural area was lower than the background value of Liaohe River Basin in Liaoning Province. The enrichment degree of heavy metals in topsoil rangs from large to small was Hg>As>Cd>Pb>Zn>Cu>Cr>Ni.The soil quality in the study area is generally good. The proportion of Cd, Cu and Zn contents exceeding the risk screening values in the exceeding standard samples is 45.56%, 29.11% and 11.47% respectively, accounting for 86.12% of the total number of exceeding standards; The evaluation results of heavy metal pollution showed that As and Cd are in a mildly polluted state, most heavy metals in soil samples were in no to mild pollution, and only Hg elements have strong to extremely strong pollution.The order of potential ecological risk of single index from high to low is Hg>Cd>As>Cu>Ni>Pb>Cr>Zn. The distribution range of potential ecological risk comprehensive index RI of surface soil in the whole region is 29.7~2358.16, with an average value of 141.9, mainly with low risk, followed by moderate risk.The results of correlation analysis and cluster analysis show that Ni, Cr, As and Pb are mainly affected by the natural source of natural weathering of the parent rock, and Cu, Zn, Cd and Hg are affected by agricultural production, industrial production, transportation, and even construction activities.Conclusions The enrichment of substances produced by the unreasonable application of agricultural substances, atmospheric deposition, industrial production, domestic garbage and coal combustion in the soil may cause pollution risks to the ecological environment quality of the study area. In the future, it is necessary to strengthen the monitoring and research on the enrichment trend of Hg, Cd, Cu and Zn elements in different plots.

       

    /

    返回文章
    返回