贵阳市观山湖区喀斯特城乡交错区土壤重金属的分布特征及风险评价  

Distribution Characteristics and Risk Assessment of Soil Heavy Metal in Karst Peri-urban Areas in Guanshan Lake District,Guiyang City

作　　者：崔瀚文 杨广斌[1,2] 崔文刚[1] CUI Hanwen;YANG Guangbin;CUI Wengang(School of Geography and Environmental Science,Guizhou Normal University,Guiyang 550025,China;Key Laboratory of Mountain Resources and Environmental Remote Sensing Application,Guizhou Normal University,Guiyang 550025,China)

机构地区：[1]贵州师范大学地理与环境科学学院,贵州贵阳550025 [2]贵州师范大学,贵州省山地资源与环境遥感应用重点实验室,贵州贵阳550025

出　　处：《云南农业大学学报（自然科学版）》2022年第2期351-357,共7页Journal of Yunnan Agricultural University:Natural Science

基　　金：国家自然科学基金委员会—贵州省人民政府喀斯特科学研究中心项目(U1812401);贵州省科学技术基金项目(黔科合基[2020]1Z031,[2019]1222,[2019]1218);贵州师范大学资助博士科研项目(GZNUD[2017]8,GZNUD[2017]9)。

摘　　要：【目的】研究喀斯特地区城乡交错区土壤中重金属分布情况,为喀斯特城郊土地资源安全利用提供科学依据。【方法】以贵阳市观山湖区城乡交错带为研究区,采集土壤样品,检测并分析土壤中Cd、Hg、As、Pb和Cr等5种重金属含量,利用单因子评价法、内梅罗综合评价法和潜在生态风险指数评价法进行风险评估,并使用克里金插值法分析其空间分布特征。【结果】单因子评价结果显示:各元素污染程度为Cd<As<Pb<Cr<Hg;内梅罗综合评价结果显示:该区域土壤重金属污染等级为重度污染;潜在生态风险因子系数评估显示:各元素风险程度为Cr<Pb<As<Cd<Hg,存在中等综合潜在风险;Hg、As和Pb元素含量呈中间低、四周高分布;Cd和Cr元素含量呈带状过渡分布。【结论】喀斯特城乡交错区重金属元素的空间分布呈现差异,研究区内土壤受多种重金属元素的复合污染,存在中等程度的潜在生态风险。[Purpose]To study the distribution of heavy metals in the soil of peri-urban areas in karst area,providing scientific basis for the safe use of land resources.[Methods]The peri-urban area of Guanshan Lake District in Guiyang City was selected as the study area.Soil samples were col-lected to detect and analysis the contents of five heavy metals:Cd,Hg,As,Pb and Cr in soil.Risk as-sessment was adopted through single factor evaluation,Nemerow comprehensive evaluation and po-tential ecological risk index evaluation method.Kriging interpolation method was adopted to study the spatial distribution characteristics.[Results]Single factor evaluation result showed that the pollu-tion degree of elements in the study area was as followed Cd<As<Pb<Cr<Hg.Nemerow comprehens-ive evaluation result showed that the soil heavy metal pollution level in this area was heavy pollution.The risk degree of elements in potential ecological risk index result showed that:Cr<Pb<As<Cd<Hg,and the comprehensive potential risk was medium level.The distribution of Hg,As and Pb content were low in the middle and high around the area,and the distribution of Cd and Cr content were zon-al transition.[Conclusion]The spatial distribution of heavy metals in karst peri-urbanl area are dif-ferent.The soil in the study area was polluted by a variety of heavy metals,which had a medium de-gree of potential ecological risk.

关 键 词：土壤污染 重金属 喀斯特地区 城乡交错区 

分 类 号：S151.9[农业科学—土壤学]