In order to explore the pollution sources and potential ecological risks of heavy metals in sediments in the upper Tarim River Basin,the surface sediments of the Aral-Shaya section of the upper reaches were selected as the research objects,and the contents of nine heavy metals elements,including Cu,Fe,Zn,Pb,As,Cr,Cd,Mn,and Ni,were determined,and their pollution and spatial distribution characteristics were analyzed.Combined with correlation analysis,cluster analysis,Absolute Principal Component Score-Multiple Linear Regression(APCS-MLR)and Positive Matrix Factorization(PMF)to analyze pollution sources and their contributions,the risk assessment of heavy metals was carried out by cluster analysis,geological cumulative index,sediment pollution index method and environmental quality standard for sediments(SQG).The results showed that except As,the average contents of Cu,Fe,Zn,Pb,Cr,Cd,Mn and Ni exceeded the background value;The sampling points with high spatial heavy metal content are basically found at river confluences and areas with dense human activities.Correlation analysis,cluster analysis and PCA/APCS analysis showed that the sources of heavy metals in sediments in the upper Tarim River Basin were divided into three categories,and the first category was Cu,Fe,Zn,Pb,Mn and Ni,which may represent poultry manure and natural sources.Category 2 are As,Cd and Ni,which may represent sources of agricultural activity;Class 3 are Pb and Cr,which may represent sources of traffiic activity.The APCS-MLR and PMF models showed that the highest contribution rate of the source was from agricultural activities,with the contribution rate of 63.2％and 52.36％,respectively.The contribution rates of APCS-MLR and PMF analysis of aquaculture sources,natural sources and transportation activity sources were 10.8％,26.0％,36.09％and 11.55％,respectively.Risk assessment methods all showed that Cd and Ni were mildly contaminated and occasionally had biotoxic effects;Zn is pollution-free,and biological toxicity effects rarely occur;The sediments in the upper Tarim River are naturally natural-low risk levels overall,but there may be potential ecological risks at the sites TH1,TH4 and TH7.
fluvial sedimentsheavy metalsource analysisrisk assessmentabsolute principal component score-multiple linear regressionpositive matrix factorization
张胜楠、孟福军、尤永军、王闪
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塔里木大学水利与建筑工程学院,阿拉尔,843300
河流沉积物 重金属 源解析 风险评估 绝对主成分-多元线性回归模型 正定矩阵因子分解法
塔里木大学校长基金塔里木大学校长基金创新研究团队项目塔里木大学校长基金青年项目Youth Project of the President's Fund of Tarim University
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NSTL
万方数据
维普
