基于APCS-MLR模型的城市绿地土壤重金属污染源解析研究  

Heavy metals pollution sources in urban green space soils:An APCS-MLR model-based analysis

作　　者：刘春英[1] 曹依 李嘉薇 肖长江 LIU Chunying;CAO Yi;LI Jiawei;XIAO Changjiang(Department of Land Resources Management,Jiangxi University of Finance and Economics,Nanchang 330013,China)

机构地区：[1]江西财经大学土地资源管理系,南昌330013

出　　处：《干旱区资源与环境》2024年第7期146-154,共9页Journal of Arid Land Resources and Environment

基　　金：江西省教育厅科学技术项目(GJJ190256);国家自然科学基金项目(42261045)资助。

摘　　要：为探究南昌市绿地土壤重金属的污染状况及污染来源,利用地累积污染指数和潜在生态风险指数评价重金属的污染程度,并采用APCS-MLR模型定量解析土壤重金属的污染来源及其贡献率。研究结果表明,Cu、Pb、Zn、Cd和Cr的平均含量是江西省土壤背景值的1.32、1.92、2.26、2.03和1.04倍。Cu、Pb、Zn、Cd和Cr的地累积指数为-0.43、0.07、0.33、0.22和-0.66,Zn、Pb、Cd处于未污染到中等程度污染水平,Pb和Zn的高值区位于市中心区域以及西北部和东部开发区,Cd含量高值区位于西北部和东部产业基地周边。Cu和Cr属于未污染水平。综合潜在生态风险指数为82.96,处于低生态风险水平,但Cd的生态风险指数为60.88,属于中等生态风险水平。由污染源解析可知,交通源对Cu、Zn、Pb的贡献率分别为52.29%、64.41%和38.01%,工业和农业混合源对Cd、Zn的贡献率分别为52.78%和86.33%,自然源对Cr、Cu的贡献率分别为83.72%和45.87%。南昌市绿地土壤重金属含量受交通和工农业活动影响较大,应重点加强交通管控,优化产业结构,降低Zn、Pb、Cd的生态风险水平。To explore the pollution characteristics and pollution sources of heavy metals in the urban green space soils of Nanchang City,the cumulative pollution index and potential ecological risk index were used to evaluate the heavy metals pollution in the study soils,and the absolute principal component/multiple linear regression(APCS-MLR)model was used to quantitatively analyze the pollution sources and the contribution rates of pollution sources.The results showed that the mean contents of Cu,Pb,Zn,Cd and Cr were 1.32,1.92,2.26,2.03 and 1.04 times higher than the background value of the Jiangxi Province.The geo-accumulation index of Cu、Pb、Zn、Cd and Cr were-0.43,0.33,0.070.22,and-0.63,respectively.Zn、Pb、Cd were at the levels of unpolluted to moderate pollution.The high value areas of Pb and Zn were located in the central area and the northwest area,and the high value areas of Cd were located in the northwest area.Cu and Cr were at the unpolluted level,and the spatial distribution of Cu and Cr were relatively uniform.The comprehensive potential ecological risk index was 82.96,which was belonged to low ecological risk level,but the ecological risk index of Cd was 60.88,which was belonged to medium ecological risk level.According to the analysis of pollution sources,the contribution rates of traffic sources to Cu,Zn and Pb was 52.29%,64.41%and 38.01%,respectively;the contribution rates of industrial and agricultural sources to Cd and Zn was 52.78%and 86.33%,respectively;the contribution rates of natural sources to Cr and Cu was 83.72%and 45.87%.The heavy metal content in urban green space soil of Nanchang was greatly affected by traffic,industrial and agricultural activities.It should focus on strengthening traffic control,optimizing industrial layout,and reducing the ecological risk level of Zn,Pb,and Cd.

关 键 词：土壤重金属 空间分布特征 污染源解析 APCS-MLR模型 南昌市 

分 类 号：X53[环境科学与工程—环境工程]