摘要
城乡结合带是较为特殊的农业生产区域,易于受到城市区域工业生产的污染.以佛山市高明核心城区农田土壤为研究对象,基于GIS空间分析和正定矩阵因子分解法(PMF),结合多种方法系统探究了表土中9种重金属的污染特征、潜在来源和贡献热点.结果表明:研究区农田土壤中As、Cd、Co、Cr、Cu、Hg、Ni、Pb和Zn含量的平均值分别为42.25、0.36、15.07、59.43、38.33、0.28、24.34、294.3和101.34 mg·kg^(-1),除Co外,其余元素平均含量均高于广东省土壤背景值.地累积指数(Igeo)显示Hg和As有轻微富集趋势,土壤综合生态风险(RI)以中度为主,而Hg为研究区内主要风险元素,其余重金属均呈轻微风险.土壤重金属含量整体呈现东高西低的空间格局,Cd、Cr、Cu、Hg、Ni、Pb和Zn的分布相似,高值区由东北向东南和西部扩散,Co的高值区呈点源集中在东北部,而As的高值区主要分布在西北部和东南部.PMF源解析模型表明研究区存在4种污染因子,其中,Cd和Cu主要来自工业排放污染(26.51%),Co和Ni受到自然母质影响(17.87%),Hg、Pb和Zn来源于交通和燃煤排放(30.80%),As和Cr的主要来源为农业物质投入(24.82%).研究结果可为城乡结合带农田土壤重金属污染防治提供理论支撑.
The urban-rural integration zone is a special area for agricultural production,which is easily polluted by industrial production in urban areas.Taking farmland soils in the core urban area of Gaoming district of Foshan as the research object,the pollution characteristics,potential sources and contribution hotspots of 9 heavy metals in the topsoil were systematically explored based on GIS spatial analysis and positive matrix factorization(PMF)combined with multiple methods.The results showed that the average values of As,Cd,Co,Cr,Cu,Hg,Ni,Pb and Zn were 42.25,0.36,15.07,59.43,38.33,0.28,24.34,294.3 and 101.34 mg·kg^(-1),respectively.Except for Co,the average contents of other elements were higher than the soil background values of Guangdong Province.The geoaccumulation index(Igeo)showed that Hg and As had a slight enrichment trend,and the soil comprehensive potential ecological risk(RI)was mainly moderate.However,Hg was the main potential ecological risk element in the study area,and the other elements were all slight risks.The overall spatial patterns of soil heavy metals were high in the east and low in the west,and the distributions of Cd,Cr,Cu,Hg,Ni,Pb and Zn was similar,with high-value areas spread from the northeast to the southeast and west.The high-value area of Co was concentrated in the northeast as a point source,while the high-value areas of As were mainly distributed in the northwest and southeast.The PMF model showed that there were four pollution factors in the study area,among which Cd and Cu were mainly came from industrial emissions(26.51%),Co and Ni were affected by natural parent materials(17.87%),Hg,Pb and Zn came from transportation and coal-fired emissions(30.80%),and the main source of As and Cr was agricultural inputs(24.82%).The research results can provide theoretical support for the prevention and control of heavy metal pollution in farmland soil in the urban-rural integration zones.
作者
徐皓帆
王诗
李舜
陈浩龙
黄陸塍
傅伟军
谢邵文
刘淑娟
周衍波
吴志峰
XU Haofan;WANG Shi;LI Shun;CHEN Haolong;HUANG Lucheng;FU Weijun;XIE Shaowen;LIUShujuan;ZHOU Yanbo;WU Zhifeng(School of Environmental and Chemical Engineering,Foshan University,Foshan 528000;School of Environment and Resources,Zhejiang A&F University,Lin'an 311300;School of Geographical Sciences and Remote Sensing,Guangzhou University,Guangzhou 510006)
出处
《环境科学学报》
CAS
CSCD
北大核心
2024年第11期277-287,共11页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.42307288)
广东省基础与应用基础研究基金(No.2022A1515110718,2022A1515110930,2022A1515110325)
国家级大学生创新创业训练计划项目(No.202311847038)
佛山市生态固碳工程技术研究中心项目。
关键词
土壤重金属
城乡结合带
生态风险
空间分布
来源解析
soil heavy metals
urban-rural integration zone
ecological risk
spatial distribution
source analysis
