摘要
了解土壤重金属浓度、分布特征及来源对于生态脆弱地区的水源地保护和土地利用管理具有重要的意义。以内蒙古锡林郭勒盟大河口水库周边4种不同地类——草地、林地、耕地和沙地作为研究对象,采集表层土壤样品,测定重金属浓度。采用地累积指数法和污染负荷指数法对土壤进行风险评价,并利用正定矩阵因子分析(PMF)模型对重金属来源进行解析。结果表明:(1)6种重金属的质量浓度分别为200~555(Mn)、18.82~210.11(Ni)、11.11~22.87(Pb)、2.13~23.76(Cu)、0.048~0.238(Cd)、28.96~64.50(Zn)mg/kg,其中Ni浓度受土壤母质和农业活动的影响,远高于内蒙古土壤元素背景值;(2)沙地的综合污染负荷最高,其次为草地、耕地、林地。Ni和Cd是研究区内的主要污染元素,其余4种元素基本属于无污染状态;(3)土壤重金属污染主要有4个来源:自然成土过程、工业活动、放牧活动和农业活动。其中Mn、Ni、Zn和Cu主要来源于自然成土过程和农牧业活动,而Pb和Cd受工业活动的影响较大,同时农业活动也是Cd的另一个主要来源。
To protect water sources and manage surrounding land in ecologically fragile areas,it is of great significance to explore the content,spatial distribution and sources of heavy metals in the surface soil.Taking four different types of grassland,woodland,cultivated land and sandy land around the Dahekou Reservoir in Xilin Gol League,Inner Mongolia as the research object,surface soil samples were collected to determine the content of heavy metals.The risk assessment of soil around the reservoir was evaluated by the geo-accumulation index method and the pollution load index method,and the source of soil heavy metals in the study area was traced by positive definite matrix factor analysis(PMF)model.The results showed that:(1)the concentration ranges of the heavy metal elements were 200-555(Mn),18.82-210.11(Ni),11.11-22.87(Pb),2.13-23.76(Cu),0.048-0.238(Cd),28.96-64.50(Zn)mg/kg,among them,content of Ni was much higher than the background value of soil elements in Inner Mongolia due to the influence of the local soil parent material and agricultural activities.(2)The pollution level of sandy land was the most serious,followed by grassland,cultivated land,woodland.Ni and Cd were the main polluting elements in the study area,the other heavy metal elements were not polluted;(3)There were four main sources of heavy metal:natural soil formation process,industrial activity,grazing activity and agricultural activity.Among them,natural soil formation process,agricultural and grazing activities were the main source of Mn,Ni,Zn and Cu,while industrial activity was the main source of Pb and Cd,agricultural activity was also another source of Cd.
作者
吴越
卢俊平
刘廷玺
张晓晶
王怡
WU Yue;LU Junping;LIU Tingxi;ZHANG Xiaojing;WANG Yi(College of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University,Hohhot Inner Mongolia 010018;Inner Mongolia Water Resources Protection and Utilization Key Laboratory,Hohhot Inner Mongolia 010018)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2023年第5期669-674,共6页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.51669023、No.51869021)
内蒙古自治区教育厅科技英才项目(No.NJYT22040)
内蒙古自治区教育厅项目(No.NJZY21476)
内蒙古自然科学基金资助项目(No.2022MS05053)
国家重点研发计划项目(No.2019YFC0409204)。
关键词
土壤
农牧交错带
重金属
风险评价
PMF模型
soil
agri-pastoral transitional zone
heavy metals
risk assessment
PMF model
