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采用化学分析方法，测定了太原市迎泽大街、新建南路和平阳路等街区的行道树国槐的一二年生枝条韧皮部含铅量的变化，并以山西农大植物园的国槐作为清洁对照树。结果显示，国槐在太原市街道污染区对空气中铅污染物有很强的吸收富集作用。枝条含铅量变化特点与交通车辆密度呈正相关，在街区车辆尾气中排放的铅是主要污染源。最高含铅量在五一广场和火车站一带，含铅量在５．００～６．８０ｐｐｍ。市区中心污染重，枝含铅量高，向市外方向延伸呈递减趋势。取样范围内污染区枝含铅量是对照区的８～９倍。
Chemical analysis was used to determine the changes of lead content in the phloem of 12-year-old branches of tree-acacia in Yingze Street, Xinjian South Road and Pingyang Road, and the locust tree of Shanxi Agricultural University Botanical Garden was used as a clean control tree. The results showed that Sophora japonica had a strong absorption and enrichment effect on lead pollutants in air in the streets of Taiyuan. The characteristics of lead content in branches and the density of traffic vehicles are positively correlated, and the lead emitted from exhaust gas of block vehicles is the main source of pollution. The highest lead content in 51 square and train station area, the lead content of 5.00 ~ 6.80ppm. Heavy urban pollution, high lead content in branches, extending outward direction of the city showed a decreasing trend. The sampling area within the contaminated area contains 8 to 9 times the amount of lead in the control area.