为了探讨城市草本植物在降低大气颗粒物(PM)的作用,选取福州市白马路常见的15种草本植物,采用滤膜分级过滤的方法,对其单位叶面积滞留总颗粒物量、 粒径<10μm和粒径<2.5μm的颗粒物量进行测定,并结合叶面结构分析其滞留颗粒物的机制.结果表明:不同草本植物春季滞留颗粒物量的差异较大,相差3倍以上,其中麦冬的单位叶面积总颗粒物滞留量最大,为3.0838 g·m-2,芭蕉最少,仅为0.7405 g·m-2;草本植物叶表面颗粒物主要是细颗粒物;叶表面结构直接影响植物滞留颗粒物的量.%Aiming at providing basic information on dust capturing capacity of different herbs, this paper selected 15 kinds of herbs which widely used on the Baima Road of Fuzhou City, using the filter method with varied filtrated membranes, measured and calculated total particulate matter, particles diameter less than 10 μm and particles diameter less than 2.5 μm per unit leaf area, and combined with leaf structure to analysis the dust retention mechanism. Test results showed that there were significant difference among particle retention ability of different herbs while the maximum was over 3 times of the minimum, Ophiopogon japonicus dustfall absorbing capacity was the highest in a level of 3.0838 g·m-2 while that of Musa basjoo was the lowest in a level of 0.7405 g·m-2 . The dustfalls on the leaf of 15 herb plants were mainly fine particles, the leaf surface structure directly affects particle retention ability of plants.
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