关键词: 绿化树种, 滞尘能力, 叶片形态, 叶表面微结构

Abstract: In order to explore the dust retention ability and influencing factors of different plant leaves, 20 species were selected as the research object in Shanxi Agricultural University in Jinzhong area. The amount of dust retention of leaves was measured by wash standing method, and the influence of leaf morphology parameters and leaf surface microstructure on dust retention ability were analyzed to reveal the influencing mechanism. The results indicate that, according to the dust retention capability, 20 species of plants can be divided into three classes. Euonymus japonicus Thumb., Styphnolobium japonicum （L.） Schott and Cotoneaster multiflorus Bge. have the highest dust retention ability with an average dust retention capability of 1.49 g/m², followed by another 12 species such as Forsythia suspensa ‘Aurea', Rhus typhina, Sorbaria kirilowii （Regel） Maxim., and so on, with an average of 0.81 g/m², and the last five species Viburnum opulus subsp. calvescens （Rehder） Sugimoto, Yulania biondii （Pamppanini） D.L.Fu, Styphnolobium japonicum f. ‘pendula', and so on, have the lowest dust retention capability 0.50 g/m²; There is a significant positive correlation between leaf morphology （long axis, short axis, average leaf area） and dust retention amount of a single leaf at 0.01 significance level, but there is no significant correlation between leaf morphology and dust retention capability of per unit area; The leaf surface of tree species has rough structures such as moderate length of villi, moderate width and depth of grooves, protrusions or pores, which are beneficial to dust retention, and the dust retention ability of tree species is proportional to the density of rough structures. It can be seen that the dust retention ability of different species is significantly different, and the leaf morphology and leaf surface microstructure are the key factors affecting the dust retention amount of the leaf surface.

Key words: green tree species, dust retention capability, leaf morphology, leaf surface microstructure