Abstract
Urban trees, especially their leaves, have the potential to capture atmospheric particulate matter (PM) and improve air quality. However, the amount of PM deposited on leaf surfaces detected by different methods varies greatly, and quantitative understanding of the relationship between PM retention capacity and various microstructures of leaf surfaces is still limited. In this study, three measurement methods, including the leaf washing (LW) method, aerosol regeneration (AR) method, and scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM–EDX) method, were used to determine the PM retention capacity of leaf surfaces of three coniferous species. Additionally, we analyzed the leaf traits and elemental composition of PM on leaves collected from different sites. The results showed that Pinus tabulaeformis and Abies holophylla were more efficient species in capturing PM than Juniperus chinensis, but different measurement methods could affect the detected results of PM accumulation on leaf surfaces. The concentrations of trace elements accumulated on leaf surfaces differed considerably between different sites. The greatest accumulation of elements that occurred on the leaf surface was at the Shenfu Highway site exposed to high PM pollution levels and the smallest accumulation at the Dongling park site. The stomatal density and contact angle were highly correlated with the PM retention capacity of leaf surfaces of the tested species (Pearson coefficient: r = 0.87, p < 0.01 and r = − 0.70, p < 0.05), while the roughness and groove width were not significantly correlated (Pearson coefficient: r = 0.16 and r = − 0.03). This study suggests that a methodological standardization for measuring PM is urgently required and this could contribute to selecting greening tree species with high air purification capacity.
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This work was supported by the National Science Foundation of China (31901361); the CFERN and BEIJING TECHNO SOLUTIONS Award Funds.
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Zhi Zhang: funding acquisition, supervision, project administration, writing—review and editing, and validation. Jialian Gong: investigation, resources, software, data curation, and writing—review and editing. Yu Li: software and data curation. Weikang Zhang: conceptualization, methodology, formal analysis, data curation, writing—original draft, and writing—review and editing. Tong Zhang: validation and formal analysis. Huan Meng: data curation and software. Xiaowei Liu: investigation and experiment.
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Zhang, Z., Gong, J., Li, Y. et al. Analysis of the influencing factors of atmospheric particulate matter accumulation on coniferous species: measurement methods, pollution level, and leaf traits. Environ Sci Pollut Res 29, 62299–62311 (2022). https://doi.org/10.1007/s11356-022-20067-7
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DOI: https://doi.org/10.1007/s11356-022-20067-7