渝北区农村土壤重金属污染及生态风险评价  

Assessment of heavy metal pollution and ecological risks of rural soils in Yubei District

作　　者：李小红[1] 刘正实 徐龙君 LI Xiaohong;LIU Zhengshi;XU Longjun(National Research Base of Intelligent Manufacturing Service,Chongqing Technology and Business University,Chongqing 400067,China;Yubei District of Chongqing Ecological Environment Monitoring Station,Chongqing 401120,China;School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, China)

机构地区：[1]重庆工商大学国家智能制造服务国际科技合作基地,重庆400067 [2]重庆市渝北区生态环境监测站,重庆401120 [3]重庆大学资源与安全学院,重庆400044

出　　处：《安徽大学学报（自然科学版）》2022年第4期94-101,共8页Journal of Anhui University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(42007363);重庆工商大学科研平台开放课题(KFJJ2019054)。

摘　　要：以渝北区农村表层土壤监测数据为基础,分析土壤重金属元素空间变异特征,并采用地累积指数和生态风险指数等方法对土壤生态风险进行评价.结果表明,渝北区土壤中Cd,Hg,As,Pb,Zn,Cr,Ni,Cu平均含量均小于《土壤环境质量农用地土壤污染风险管控标准》(GB15618-2018)规定的筛选值,但Cd,Hg,Zn,Cr,Cu含量平均值和中位值均超过重庆市土壤背景值,表层土壤污染最严重的是Hg,其次是Zn和Cu;渝北区土壤生态风险轻微、中等和强的比例分别为70.42%,28.17%,1.41%,贡献率最高的元素为Hg和Cd(分别为52.66%和34.78%);渝北区农村表层土壤重金属主要来源于人类日常生活、自然本底、工业生产和农业生产等.Based on the monitoring data of rural topsoil in Yubei District(YuB),the spatial variation characteristics of heavy metals(HMs)in soil were analyzed,and the geo-accumulation index(I_(geo))and the potential ecological risk index(PERI)were applied to evaluate the ecological risk of soil.The results showed that the average concentrations of Cd,Hg,As,Pb,Zn,Cr,Ni and Cu were less than the screening values in soil environmental quality risk control standard for soil contamination of agricultural land(GB15618-2018),but those of Cd,Hg,Zn,Cr and Cu were higher than the average background values(ABV)of soil in Chongqing.The most serious pollution of topsoil was Hg,followed by Zn and Cu.The PERI revealed that the proportions of low ecological risk,moderate risk and high risk soil samples were 70.42%,28.17%and 1.41%of the total number of samples,respectively.Hg and Cd were the major risk sources,and the contribution ratios were respectively 52.66%and 34.78%.Heavy metals in rural topsoil in YuB mainly came from human daily life,natural background,industrial processing and agricultural production.

关 键 词：土壤重金属污染 生态风险评价 渝北区 川渝高竹新区 

分 类 号：X53[环境科学与工程—环境工程] X820.4