研究了山西省太原市、榆次市和太谷县城３个规模大小和污染程度不同的城市，主要街道两侧行道树国槐杖叶内铅内铅的含量．结果表明：国槐对街道污染空气中的铅有很强的吸收和富集作用．枝条内含铅量与街道上交通车辆密度呈正相关，最高含铅量区域在太原市火车站和五一广场一带从市区中心向郊外延伸空气污染强度减弱，国槐枝叶内含铅量也呈梯度降低趋势３个城市的国槐枝叶内含铅量与其污染强度相吻合一年四季国槐都能通过枝、叶吸收和积累铅污染物，但其含量与树木生理活动、生长周期密切相关 In the cities of Taiyuan, Yuci and Taigu county of Shanxi Province, the content of lead in the leaves of S. japonicus on both sides of the main street in three cities of different size and pollution degree was studied. The results showed that Sophora japonica had strong absorption and enrichment of Pb in air polluted by streets. The amount of lead in the branches is positively correlated with the density of traffic on the streets. The highest level of lead content in Taiyuan Railway Station and Wuyi Square extends from the urban center to the outskirts of the air pollution intensity weakened, and the amount of lead in the branches and leaves of Sophora japonica Gradient decreasing trend The content of lead in the branches and leaves of the three cities coincided with the intensity of pollution. Acacia can absorb and accumulate lead pollutants through branches and leaves all year long, but its content is closely related to the physiological activities and growth cycle of trees