中文摘要：

以兰州城区乔木（槐树和榆树）、灌木（杜鹃和黄杨）、草本（黑麦草和三叶草）3类植物为试材,研究其滞尘量的差异及蒙尘后的生理响应。结果表明：不同绿化植物的滞尘能力差异显著,3种植物平均单位面积滞尘量表现为乔木〉灌木〉草本;不同绿化植物叶面滞尘量达到饱和时间夏季约为12d、秋季约9d,且3种植物秋季叶片平均滞尘量大于夏季叶片滞尘量;对叶面尘粒径分析表明,叶面尘中滞留的颗粒物中大多数是TSP（悬浮颗粒物）,同时对PM10和PM2.5均有一定量的吸收,降尘物中PM2.5、PM10和TSP相对含量均以乔木最高、灌木和草本较低,其中PM2.5和PM10含量在乔木、灌木和草本之间的差异均达到显著水平,而3种植物TSP含量的差异并不显著;随着叶片蒙尘时间的延长,相对含水量出现先下降后上升的趋势,比叶重和脯氨酸含量则呈现先增加后降低趋势,且3种植物叶片秋季相对含水量、比叶重和脯氨酸含量均高于夏季。相关性分析表明,3种植物滞尘能力与车流量呈极显著正相关关系。

英文摘要：

Taking three green plants including arbors（Locust tree and Ulmus pumila）,shrubs（Rhododendron and Buxus microphylla）,herbs（Lolium perenne and Trifolium repens）as experimentals material,the differences of dust retention quantity and physiological response after dust were studied.The results showed that the dust retention capacity of these green plants were significantly different,and the average unit area dust catching quantity orderedas arbors shrubs herbs.The amount of foliar dust of three green plants reached saturation time about 12 days in summer,and 9 days in autumn,the amount of dust retention of three green plants in autumn was greater than that in summer.The dust particle size analysis showed that foliar dust retention of particles in most was TSP,while PM10 and PM2.5 had a certain amount of adsorption.The relative content of PM2.5,PM10 and TSP in arbors was top,in shrubs and herbs was,low PM10 and PM2.5 contents had significant differences in three green plants,while TSP content had no significant difference.As the dusty time prolonging,the relative water content first dcreased and then increased,while LMA and proline content was contrary to relative water content,and the relative water content,LMA and proline content of three green plants in autumn was greater than those in summer.Correlation analysis suggested that the dust retention capacity of three green plants had significantly positive correlation with traffic volume.