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空气颗粒物能够危害人体健康,而植被可以有效减少空气中颗粒物的浓度,提高环境质量。本文利用原子力显微镜、扫描电镜检测不同树种叶片表面微特征(气孔密度、蜡质层、油脂、绒毛、纹理等)、粗糙度和湿润性,研究了城市中不同树种叶片微结构对滞纳空气颗粒物功能的影响。结果表明:不同树种之间滞尘能力存在差异,针叶树种滞尘能力要高于阔叶树种;叶片表面结构对于树种滞尘能力的影响非常显著(P<0.05),其中测试树种中油松、白皮松叶片滞尘主要受气孔密度、蜡质层厚度、油脂、纹理的影响,而旱柳、五角枫、银杏和杨树叶片滞尘能力主要受叶片表面粗糙度的影响;叶片表面湿润性与叶片的滞尘能力存在显著负相关(P<0.05)。
Airborne particles can endanger human health, and vegetation can effectively reduce the concentration of airborne particles and improve the quality of the environment. In this paper, the leaf surface micro-features (stomatal density, waxy layer, oil, villi, texture, etc.), roughness and wettability of different tree species were examined by atomic force microscopy and scanning electron microscopy. Effect of function. The results showed that there was a difference in dust-holding capacity among different species, and the dust-holding capability of coniferous species was higher than that of broad-leaved species. The effect of leaf surface structure on dust-holding capacity was significant (P <0.05). Among the tested species, Pinus tabulaeformis and Pinus bungeana Dust retention was mainly affected by stomatal density, thickness of waxy layer, oil and texture, but the dust retention capacity of the leaves of F. mandshuricus, F. pentaphylla, Ginkgo biloba and poplar was mainly affected by leaf surface roughness; There was a significant negative correlation between dust abilities (P <0.05).