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Chen, Siqi; Yu, Hua; Teng, Xiaomi; Dong, Ming; Li, Weijun
The Science of the total environment, 12/2022, Volume: 853Journal Article
The role of plants in alleviating aerosol pollution has drawn extensive attention. Most studies focus on compositions of aerosol particles on urban plants, while the leaf traits related to particle retention have not yet been intensively studied. This study selected five typical urban plants (Loropetalum chinense, Rhododendron simsii, Euonymus japonicus, Photinia × fraseri, Osmanthus fragrans), and employed scanning electron microscope (SEM) and ion chromatography, aiming to investigate the accumulation features of aerosol particles and the relationships between leaf traits and particle retention. Results show that aerosol particles were mainly retained on the adaxial leaf surface, the fine particles (Φ ≤ 2.5 μm) were the predominant components (77.8 % by number) on the leaves, and the dominant water-soluble ions of particles were Ca2+, SO42−, and NO3−. By comparison, E. japonicus and P. fraseri were efficient in the retention of fine and coarse particles (2.5 <Φ ≤ 10 μm), but L. chinense was capable to retain more large particles (Φ > 10 μm). The correlation analysis indicates that leaf traits are closely related to the accumulation of aerosol particles. The result shows that plant leaves with larger stomatal area, lower stomatal density, smaller specific leaf area and higher in epicuticular wax content can retain more aerosol particles. This result indicates that the leaves are capable of retaining aerosol particles via the synergy of multiple leaf traits, such as higher wax content and the fewer but larger stomata on their leaf surfaces. This study is helpful to understand the interactions between leaf traits and particle retention, and it further contributes to the selection of potential dust-retaining plants, which is of great significance for the alleviation of urban air pollution. Display omitted •Fine particles were the predominant components of retained particles with diverse types and sources.•E. japonicus and P. fraseri were more efficient in particle accumulation than the other studied species.•The leaf traits (e.g., large stomatal area, low stomatal density, small specific leaf area and high epicuticular wax content) contributed to particle deposition.•This study gives insights into the relationship between leaf traits and particle accumulation, and provides a reference for the optimal selection of dust-retaining plants to alleviate aerosol pollutions.
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