摘要
【研究目的】通过研究宁夏固原市原州区表层土壤重金属含量及空间分布特征,对该地区进行生态风险评价,明确原州区表层土壤重金属累积情况。【研究方法】系统采集了研究区表层土壤样品12988件,获取了As、Cd、Cr、Cu、Hg、Ni、Pb和Zn等8种重金属含量,采用单因子指数法、内梅罗综合污染指数法和潜在生态危害指数法进行土壤重金属生态风险评价。【研究结果】与宁夏自治区表层土壤元素背景值相比,原州区表层土壤8种重金属富集系数分别为As(1.01)、Cd(1.42)、Cr(1.04)、Cu(0.99)、Hg(1.03)、Ni(0.81)、Pb(1.01)和Zn(1.07)。土壤中8种重金属空间分布特征相似,高值区主要分布在六盘山东西两侧、固原市区、张易镇和黄铎堡镇等人类活动频繁区域,在东北部第四纪黄土覆盖区的炭山乡、寨科乡土壤重金属富集程度较低。单因子指数法评价结果显示,原州区土壤整体清洁,无污染。内梅罗综合污染指数法分析结果显示,土壤各重金属元素污染指数均小于0.7,属清洁水平,污染风险等级为安全。潜在生态危害指数法分析结果显示,Cd和Hg单元素潜在危害指数达到中等风险水平,重金属综合潜在生态危害指数为轻微风险。【结论】固原市原州区土壤重金属生态风险较低,受人类活动影响的区域,表层土壤重金属存在轻微富集。
[Objective]This study investigated the contents and spatial distributions of heavy metals in surface soils in Yuanzhou District,Guyuan City,Ningxia,evaluating heavy metal accumulation and its associated ecological risk.[Methods]A total of 12988 soil samples were collected and the levels of eight heavy metals,namely,As,Cd,Cr,Cu,Hg,Ni,Pb,and Zn,were measured.The single-factor index,Nemerow comprehensive pollution index,and potential ecological hazard index were used to estimate the ecological risks associated with heavy metal contamination in soils.[Results]Compared to the background values of the Ningxia Autonomous Region,the average enrichment coefficients of As,Cd,Cr,Cu,Hg,Ni,Pb,and Zn were 1.01,1.42,1.04,0.99,1.03,0.81,1.01,and 1.07,respectively.Similar distributions of the eight heavy metals,with high concentrations,were observed in areas characterized by high human activity,such as the east and west sides of Liupan Mountain,as well as Guyuan City,Zhangyi Town,and Huangduobao Town.In contrast,low concentrations were observed in Tanshan Township and Zhaike Township in the northeast Quaternary areas with loess-covered soil.Single-factor index evaluation revealed that the soil was"clean"in the Yuanzhou area.Evaluation using the Nemerow comprehensive pollution index indicated that the soil pollution index of all heavy metals was less than 0.7,which is considered"clean."While the single-element potential hazard index of Cd and Hg showed a level of moderate risk,the comprehensive potential ecological hazard index of the heavy metals showed slight risk levels.[Conclusions]The soil quality in Yuanzhou District,Guyuan City,is in good condition,although slight enrichment of heavy metals was seen in the topsoil due to human activities in some areas.
作者
毕书海
周文辉
袁国礼
高琪
李永春
邰苏日嘎拉
BI Shuhai;ZHOU Wenhui;YUAN Guoli;GAO Qi;LI Yongchun;TAI Surigala(Hohhot General Survey of Natural Resources Center,China Geological Survey,Hohhot 010010,Inner Mongolia,China;School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China)
出处
《中国地质》
北大核心
2025年第1期289-299,共11页
Geology in China
基金
中国地质调查局项目(DD20191015)资助。
关键词
土壤重金属
污染指数
生态风险
环境地质调查工程
固原市
宁夏
soil heavy metals
pollution index
ecological risk
environmental geological survey engineering
Guyuan City
Ningxia
