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文章以北京大兴南海子公园常见绿化树种为研究对象,应用气溶胶再发生器对植物叶片在自然状态和饱和状态下PM_(2.5)吸滞量进行定量分析,分析叶表面微形态特征。结果表明:不同树种自然状态下单位面积PM_(2.5)吸滞量存在显著差异,整体表现为针叶树种显著高于阔叶、灌木树种,其中桧柏、油松PM_(2.5)吸滞量较大,银杏、杨树吸滞量较小;饱和状态下,PM_(2.5)吸滞量显著增加,但其吸滞能力排序与自然状态下基本保持一致。叶表面存在气孔、细密沟状组织等,有利于叶片吸滞PM_(2.5)等细颗粒物;叶表面光滑,无明显起伏,存在较宽沟壑,不利于叶片吸滞细颗粒物。为合理选择滞尘能力强的绿化树种提供理论依据,从而提高城市绿化植被的环保效益。
Taking the common greening tree species in Nanhaizi Park, Daxing, Beijing as the research object, aerosol regenerator was used to quantify the amount of PM 2.5 sinking in the natural state and the saturated state, and the leaf surface micromorphological characteristics were analyzed. The results showed that there were significant differences in the PM_ (2.5) sediment densities per unit area of different tree species under natural conditions. The overall performance of the coniferous tree species was significantly higher than that of the broadleaf and shrub species. The PM_ (2.5) , While that of Ginkgo biloba and Poplar was smaller. Under saturated condition, the PM_ (2.5) absorption increased significantly, but the order of its ability to absorb lactic acid remained basically the same under natural conditions. There are stomata on the leaf surface and fine gully structure, which is good for leaf PM_ (2.5) and other fine particles; the leaf surface is smooth, without obvious ups and downs, there is a wide gully, which is not conducive to the fine particles. It provides a theoretical basis for the reasonable selection of afforestation species with high dust retention capacity and thus enhances the environmental benefits of urban greening vegetation.