摘要
本研究以陕西省韩城市凿开河流域为研究区,检测了土壤表层Pb、Mn、Zn、Co、Cr、Cu、As、Cd、Hg 9种重金属元素含量,通过相关性分析、主成分分析及聚类分析等方法探究了重金属元素的来源,并对研究区重金属污染状况和潜在生态风险进行了评价。结果表明:1)凿开河流域土壤重金属含量显著超过陕西省土壤背景值,Pb、Mn、Zn、Cd、Cr、Zn、Co的含量都较高,但As和Hg的含量却较低,特别是Cd的含量是陕西省土壤背景值的2.8倍;9种重金属元素的变异系数从高到低依次是Hg、Cd、As、Cu、Pb、Zn、Mn、Co、Cr,其中Hg、Cd、As 3种元素呈高度变异。2)凿开河流域重金属含量较高是人类活动与自然因素双重作用的结果。3)在凿开河流域,9种重金属元素的地累积指数平均值从大到小依次为Cd>Pb>Mn>Cu>Cr>Co>Zn>As>Hg,其中以Cd污染最为显著,其次是Pb,但均为轻度污染,其他元素均达到清洁标准。4)土壤重金属元素潜在生态风险评价结果表明,凿开河流域总体呈轻微生态风险,但风险值趋于中等风险下限阈值,且Cd、Hg为主要生态风险因子。
Taking Zaokai River Basin in Hancheng City,Shaanxi Province as the research area,the contents of 9 heavy metals such as Pb,Mn,Zn,Co,Cr,Cu,AS,Cd and Hg in soil surface were detected,and the sources of heavy metals were explored through correlation analysis,principal component analysis and cluster analysis.The status and potential ecological risk of heavy metal pollution in the study area were evaluated.The results showed that:1)the content of heavy metals in the soil of Zaokai River Basin significantly exceeded the background value of Shaanxi Province,and the contents of Pb,Mn,Zn,Cd,Cr,Zn and Co were all higher,but the contents of As and Hg were lower,especially the content of Cd was 2.8 times of the background value of Shaanxi Province.The variation coefficients of the 9 heavy metal elements are Hg,Cd,As,Cu,Pb,Zn,Mn,Co and Cr in order from high to low,among which Hg,Cd and As are highly variable.2)The high content of heavy metals in the Zaokai River Basin is the result of the dual effects of human activities and natural factors.3)In the Zaokai River Basin,the average ground accumulation index of 9 heavy metals was Cd>Pb>Mn>Cu>Cr>Co>Zn>As>Hg from large to small,Cd pollution is the most significant,followed by Pb,but all are mild pollution,and other elements meet the clean standard.4)The results of potential ecological risk assessment of soil heavy metal elements showed that the overall ecological risk was slight,but the risk value tended to the lower limit of medium risk,and Cd and Hg were the main ecological risk factors.
作者
喜俊生
王玲
李新斌
康成鑫
司瑞
张猛
XI Jun-sheng;WANG Ling;LI Xin-bin;KANG Cheng-xin;SI Rui;ZHANG Meng(School of Human Settlement Environment and Architectural Engineering,Xi'an Jiaotong University,Xi'an 710054,China;Xi'an Center of Mineral Resources Survey,China Geological Survey,Xi'an 710100,China;Ji'an Preschool Teachers College,Ji'an 343000,China)
出处
《环境生态学》
2024年第12期1-8,共8页
Environmental Ecology
基金
中国地质调查局项目黄河中游(陕西段)自然资源综合调查(DD20220123,DD20220868)
黄土高原南缘韩城地区自然资源综合调查(DD20242461)资助。
关键词
土壤
重金属
源解析
污染评价
Soil
heavy metal
source resolution
pollution assessment
