重庆大学学报2025，Vol.48Issue(12)：33-48,16.DOI:10.11835/j.issn.1000-582X.2024.277
农村-城市二元结构对典型山地河流沉积物重金属空间分布及来源影响研究
Effect of the rural-urban binary structure on the spatial distribution and sources of heavy metals in the sediments of a typical mountainous river
摘要
Abstract
The spatial distribution of heavy metals in the sediments of mountainous rivers is significantly influenced by population density and industrial structure.In December 2019,sediment samples were collected from the Taohuaxi River-a typical mountainous river spanning both urban and rural areas in Changshou District,Chongqing-to investigate heavy metal contamination.The concentrations of eight heavy metals were measured,revealing that their average contents in the urban section were higher than those in the rural section,with cadmium(Cd)and copper(Cu)showing significant differences.Population density was found to be a key factor shaping the spatial distribution of heavy metals in river sediments.According to the improved geoaccumulation index(Im),20.59％of the monitored sites exhibited near moderate or moderate pollution,indicating localized enrichment of heavy metals along the river.Based on the potential ecological risk index(RI),67.65％of sites presented medium or high potential ecological risks.The sediment quality guidelines(SQGs)assessment further indicated that heavy metals posed a moderate toxicological risk to aquatic organisms.Overall,the ecological risk of heavy metals in the sediments of the Taohuaxi River should not be overlooked.Positive matrix factorization(PMF)model analysis identified five major sources of heavy metals,with contributions in the order of aquaculture sources(38.79％)>natural sources(20.40％)>mixed anthropogenic sources(20.35％)>industrial sources type Ⅱ(16.69％)>industrial sources type Ⅰ(3.78％).关键词
山地河流/重金属元素/生态风险/PMF模型/来源解析Key words
mountainous river/heavy metals/ecological risk/PMF model/source apportionment分类
资源环境引用本文复制引用
WANG Chao,LI Cheng,JIA Boyang,JIAO Yang,CHEN Yanlin,PAN Chengyong,PAN Yujie..农村-城市二元结构对典型山地河流沉积物重金属空间分布及来源影响研究[J].重庆大学学报,2025,48(12):33-48,16.基金项目
长江生态环保集团有限公司科研项目资助(HBZB2022095). Supported by Scientific and Research Project of Yangtze Ecology and Environment Co.,Ltd.(HBZB2022095). （HBZB2022095）
