丹江口库区农田土壤重金属分布和来源解析  

Source Apportionments and Spatial Distribution of Heavy Metal Contamination in Soils of Danjiangkou Reservoir

作　　者：高园园 张海军[2,3] 孔璐璐[4,5] 王书转 白景锋 周启星[6] GAO Yuanyuan;ZHANG Haijun;KONG Lulu;WANG Shuzhuan;BAI Jingfeng;ZHOU Qixing(Dongguan Research Institute of Environmental Science,Dongguan 523009,China;College of Environment Science and Tourism,Nanyang Normal University,Nanyang 473061,China;Collaborative Innovation Center of Water Security for Water Source Region of Mid-route Project of South-North Water Diversion of Henan Province,Nanyang 473061,China;College of Life Science,Hebei Normal University,Shijiazhuang 050024,China;Department of Resource and Environment,Shijiazhuang University,Shijiazhuang 050035,China;Key Laboratory of Pollution Processes and Environmental Criteria of Ministry of Education,Tianjin Key Laboratory of Environmental Remediation and Pollution Control,College of Environmental Science and Engineering,Nankai University,Tianjin 300071,China)

机构地区：[1]东莞市环境科学研究所,广东东莞523009 [2]南阳师范学院环境科学与旅游学院,河南南阳473061 [3]南水北调中线水源区水安全河南省协同创新中心,河南省南水北调中线水源区生态安全重点实验室,河南南阳473061 [4]河北师范大学生命科学学院,河北石家庄050024 [5]石家庄学院资源与环境科学学院,河北石家庄050035 [6]南开大学环境科学与工程学院,环境污染过程与基准教育部重点实验室/天津市城市生态环境修复与污染防治重点实验室,天津300071

出　　处：《环境科学与技术》2020年第8期211-218,共8页Environmental Science & Technology

基　　金：河南省教育厅重点研究项目(16B610010)。

摘　　要：为开展丹江口水库周边农田土壤重金属污染来源及其贡献率的空间分布特征研究,文章采集丹库周边66个0~20 cm表层土壤样品,测定Cd、Pb、Cr、Cu、Zn和Ni等6种重金属的污染特征和空间分布,结合2种污染指数-单因子污染指数法和内梅罗综合污染指数法对土壤中重金属的污染进行评价,同时利用相关性分析和主成分分析/绝对主成分分数(PCA/APCS)受体模型定量解析了研究区域内6种重金属的来源,结果表明:(1)Cr的平均浓度(19.706 mg/kg)低于河南省土壤环境背景值,其他5种重金属平均值均高于河南省土壤环境背景值,其中,Cd的平均浓度(1.784 mg/kg)则为河南省土壤环境背景值的26.89倍;重金属Cd为重污染,Cu污染等级为中污染,其他重金属均是轻污染;不同区域受影响方式和大小不同,6种重金属在区域分布上也表现出一定的差异性;(2)结合相关性分析、PCA/APCS受体模型和地统计学分析可知,6种重金属元素可被辨识为3种主成分,PC1(Ni、Zn、Pb、Cu)农业源,PC2(Cr)自然源,PC3(Cd)人为源,贡献率分别为35.698%、60.697%和81.747%。The pollution source of soil heavy metals concentrations,pollution characteristics of Cd,Pb,Cr,Cu,Zn and Ni in the farmland soil from Danjiangkou Reservoir was analyzed through field investigation which taking 66 surface soils samples(depth of 0~20 cm)from farmland.The single factor pollution index method and Nemerow composite pollution index method were used as the pollution evaluation index.The results indicated that the average concentration of Cr(19.706 mg/kg)was lower than the environmental background values of Henan Province,and the other elements were higher than their environmental background values.The average concentration of Cd(1.784 mg/kg)was 26.89 times greater than the environmental background values of Henan Province.Cd was the major contaminated element in the new submerged area in the Danjiangkou Reservoir,Cu was in moderate level,while the pollution levels of Cr,Zn,Pb and Ni were classified as not polluted.Combined with the correlation analysis,PCA/APCS receptor model and the geostatistical analysis,6 heavy metals could be classified as 3 Principal Components(PCs).PC1(Ni,Zn,Pb and Cu)was the factors dominated by agriculture sources;PC2(Cr)represented the factors from natural sources;PC3(Cd)was contributed by industrial sources,which accounted for 35.698%,60.697%and 81.747%respectively.

关 键 词：丹江口水库 重金属 PCA/APCS受体模型 源解析 

分 类 号：X53[环境科学与工程—环境工程]