长春市主要街路代表性植物叶片铅含量分析

应用火焰原子吸收光谱法,对长春市14条主要街路交通密集地段两侧绿化带中采集到的12种代表性植物叶片的铅含量进行了分析。结果表明,植物叶片的铅含量范围在8.20 mg/kg～58.5 mg/kg之间,平均值为19.7 mg/kg。木本植物叶片的平均铅富集能力略低于草本植物,并且木本植物叶片平均铅含量的空间变异性较大;木本植物中杨树叶片的平均铅富集能力最强而榆树最低,草本植物中绣线菊的叶片平均铅富集能力最强而八宝景天最低;草本植物中绣线菊的叶片在所有供试植物叶片中平均铅富集能力最强,其次为木本植物中杨树的叶片,而草本植物中八宝景天的叶片平均铅富集能力最低。不同植物在同一街路以及同种植物在不同街路之间其叶片的铅含量都不同。

Lead Content of Plant Leaf Blade in Major Streets of Changchun City

The Pb contents of 12 different kinds of representative plant leaves,which come from the green belt on both sides of the main streets with intensive traffic in Changchun city,were analyzed by using flame atomic absorption spectrometry.The results showed that the Pb contents of plant leaves ranged between 8.20 and 58.5 mg/kg,with average value was 19.7 mg/kg.The average Pb accumulation capacity of woody plant leaves was slightly lower than that of herbaceous plant leaves,and the spatial variability of average Pb content for the former was larger.Among all the tested woody plants,the average Pb accumulation capacity of the Poplar was the largest,while that of the Elm was the least.And for all the herbaceous plants in our study,the average Pb accumulation capacity of the Spiraea was the largest,while that of the Sedumspectabile was the lowest.Among all our tested plant leaves,the average Pb accumulation capacity of Spiraea was the largest,and that of the Sedumspectabile was the lowest.The leaves form the different plant species had different Pb contents in the same street,and also the leaves form the same plant species had different Pb contents in the different streets.