道路绿地植物叶面可吸入颗粒物中重金属累积状况及污染评价

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中图分类号X173 文献标识码A 文章编号 1007-7731（2025）19-0062-05

DOI号10.16377/j.cnki.issn1007-7731.2025.19.015

Accumulationof heavy metals in inhalableparticulate matter on the leaf surface of road green plants and pollution evaluation

WANG HuiLIU ChangweiSHI Ning SUN Dan SUN Buxu （Jiangsu Suqian Environmental Monitoring Center， Suqian 2238OO，China）

AbstractTaking the road greenspaces in the SQ City （SC District，SS District，SY District，JK District，and HB District）as the research object，leaves of 6 plants species including Ligustrum compactum and Ligustrum japonicum were collected.The contentsof6heavy metals （Cd，Pb，Cr，Cu，Ni，and Zn）inthe inhalable particleson leaf surfaces were determined.The pollution load index （ PLI ）and the single-factor and comprehensive potential ecological risk indices （ RI and Eri ） were used to analyze the accumulation status and polution assessment of heavy metals.The results showedthatthe accumulationcapacities fordiferent heavy metals intheinhalable particles on the leaves ofthe 6 plants varied.Among them，Pitosporum tobiraleaves had high Zn; Ligustrum lucidum leaves had high Cr，Cu，andCd;and Magnolia grandiflora leaves had high Ni and Pb contents，with values of 65.41，34.42，18.54，0.40，9.29，and 4.63 mg/ kg，respectively.By geographicaldistrict，plants in SC District hadhigh Cuon leaves;those inSYDistrict had high Ni; those inJK District had high Cdand Pb;and those in HB District had high Crand Zn，withcontentsof 19.65，11.14， 0.31，3.67， 38.96，and 67.90 mg/kg，respectively. Regarding pollution assessment， the PLI for Cr， Ni， Cu，and Pb on the leaves of all greening tree species was<1， indicating no pollution. The PLI for Cd on the leavesof Magnolia grandiflora， Ligustrum japonicum，and Photinia serratifolia ranged from 1 to 2，indicating mild pollution. The PLI for Cd on the leaves of Pittosporum tobira and Ligustrum lucidum was >3 ， indicating severe pollution. The Eri values for Cr， Ni， Cu， Zn， and Pb on the leaves of the 6 plants were all below 4O，and the RI wasbelow 150， suggesting a light ecological risk. In contrast， the Erifor Cd ranged from 14.508 to 144.231，and the RI reached 371.295， indicating a relatively strong ecological risk.Insummary，priorityshould be given to the preventionand control ofCdpolution inpractical applications.

Keywordsroad green space; inhalable particulate matter; heavy metals; pollution evaluation

源自汽车尾气排放及轮胎、刹车片磨损的重金属，因其强烈的毒性、不可降解性和生物富集效应，对生态系统与人体健康构成严重威胁[1-2]。（剩余6753字）