山东省唐口矿区采煤塌陷地复垦土壤重金属潜在生态风险评价  

Potential Ecological Risk Assessment of Heavy Metals in Soil for Reclamation of Coal Mining Collapsed Land in Tangkou Mining Area in Shandong Province

作　　者：王志亮[1,2] 尹亚军 张方龙 郭广军 陈宗成 陈谢霞[1,2] 杨成明 李传夏 郑国栋 WANG Zhiliang;YIN Yajun;ZHANG Fanglong;GUO Guangjun;CHEN Zongcheng;CHEN Xiexia;YANG Chengming;LI Chuanxia;ZHENG Guodong(Lunan Geo-engineering Exploration Institute(No.2 Geological Brigade of Shandong Provincial Bureau of Geology and Mineral Resources),Shandong Yanzhou 272100,China;Technology Innovation Center of Restoration and Reclamation in Mining induced Subsidence Land,Shandong Yanzhou 272100,China;Shandong Institute of Geological Sciences,Shandong Ji'nan 250013,China)

机构地区：[1]山东省鲁南地质工程勘察院(山东省地质矿产勘查开发局第二地质大队),山东兖州272100 [2]自然资源部采煤沉陷区综合治理工程技术创新中心,山东兖州272100 [3]山东省地质科学研究院,山东济南250013

出　　处：《山东国土资源》2024年第7期32-38,共7页Shandong Land and Resources

基　　金：山东省重点研发计划(重大科技创新工程),矿区土壤生态修复与大宗固废高值利用关键技术及工程示范(项目编码:2020CXGC011403);2023年济宁市重点研发计划项目,采煤塌陷地生态修复关键技术集成与示范(项目编码:2023HHCG003)。

摘　　要：本文采集山东省唐口矿区采煤塌陷地复垦土壤样品39个,分析了测试样品中As、Hg、Cr、Pb、Zn、Cd、Cu、Ni的含量及pH,选取不同的参比值,采用潜在生态风险指数法对复垦土壤中重金属污染状况和潜在生态风险进行了评价。结果表明,研究区复垦土壤中重金属含量除Cd外均未超过《土壤环境质量农用地土壤污染风险管控标准(试行)》(GB15618—2018)中规定的农用地土壤污染风险筛选值。Hg、Pb、Zn的平均含量大于济宁市表层土壤地球化学背景值。复垦土壤重金属相关性分析表明,Cr-Ni元素具有较高同源性;As-Cu-Pb-Zn元素可能具有相似的来源,并且伴随有复合来源的可能;Hg和Cd元素来源与其他重金属不同。采用国家风险筛选值为参比值时,研究区复垦土壤整体生态风险水平为轻,但单项重金属Cd存在中度污染风险,需要重点关注。采用土壤背景值为参比值时,研究区复垦土壤中As、Pb、Ni、Cu、Cr和Zn处于轻度生态风险等级;Hg处于强生态风险等级,部分样品存在很强、极强生态风险等级;Cd虽处于轻度生态风险等级,但部分样品存在中度、强生态风险等级。研究区复垦土壤重金属综合潜在生态风险以轻度、中度为主,Hg和Cd是主要贡献因子。In this paper,through collecting 39 soil samples from a coal mining subsidence area in Shandong province,the content and pH value of As,Hg,Cr,Pb,Zn,Cd,Cu,Ni in the tested samples have been analyzed.Different reference ratios have been selected and the potential ecological risk index method has been used to evaluate the heavy metal pollution status and potential ecological risk in reclaimed soil.It is showed that heavy metal content in reclaimed soil in the study area can not exceed the soil pollution risk screening value specified in the"Soil Environmental Quality Agricultural Land Soil Pollution Risk Control Standard(Trial)(GB15618—2018)"except for Cd.The average contents of Hg,Pb,and Zn are higher than geochemical background values of the surface soil in Ji'ning city.The correlation analysis of heavy metals in reclaimed soil shows that Cr Ni element has high homology.As-Cu-Pb-Zn elements may have similar sources,accompanied by the possibility of composite sources.The sources of Hg and Cd elements are different from other heavy metals.When using the national risk screening value as a reference,the overall ecological risk level of the reclaimed soil in the study area is light as showed by the evaluation results.There is a moderate pollution risk of single heavy metal Cd which needs to be focused on.When using soil background value as a reference,As,Pb,Ni,Cu,Cr and Zn in the reclaimed soil in the study area are at a mild ecological risk level as showed by the evaluation results.Hg is at a strong ecological risk level,and some samples have very strong or extremely strong ecological risk levels.Although Cd is at a mild ecological risk level,some samples have moderate to strong ecological risk levels.The comprehensive potential ecological risks of heavy metals in the reclaimed soil in the study area are mainly mild and moderate with Hg and Cd being the main contributing factors.

关 键 词：采煤塌陷地 复垦土壤 重金属 潜在生态风险评价 

分 类 号：S154.4[农业科学—土壤学] X53[农业科学—农业基础科学]