Particles deposited on leaf surfaces can be resuspended back into the atmosphere, thus generating pollution diffusion and hazarding to human health. The net amount of particles resuspended depends on leaf traits and weather conditions, such as speed wind and leaf roughness. However, little is known about the influence of leaf traits of different tree species on particle resuspension under certain conditions. In this study, we chose 6 typical greening tree species from Northeast China and focused on four-leaf traits: roughness, contact angle, stomatal density, and groove width. The wind tunnel was used to measure particle resuspension from leaf surfaces at different wind speeds (1, 2, 3 m/s) and test duration (10, 20, 30 min). Subsequently, we investigated the correlation between particle resuspension and leaf traits. The results indicated that had the highest resuspension fraction (61.38%), followed by (58.05%), (54.21%), (53.59%), and (50.51%), while displayed the lowest particle resuspension fraction (32.02%). Particle resuspension rates of the tested species ranged from (8.24 ± 0.53) × 10/s to (2.65 ± 0.51) × 10/s, which was found to increase with wind speed enhancement and decrease with duration extension. With increasing the wind speed, the and were more efficient than and in avoiding particle resuspension. Roughness and stomatal density were a significant negative correlation with particle resuspension rates, which demonstrates that the leaf surface traits can affect the particle resuspension process. Finally, our results suggest that the main factors influencing particle resuspension from leaf surfaces are wind speed, roughness, and stomatal density, which will provide a scientific foundation for pollution diffusion in future studies.

中文翻译：

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叶子表面的颗粒再悬浮：物种、叶子性状和风速的影响


沉积在叶子表面的颗粒可以重新悬浮回大气中，从而产生污染扩散并危害人类健康。重新悬浮的颗粒的净量取决于叶子的性状和天气条件，例如风速和叶子的粗糙度。然而，对于特定条件下不同树种的叶片性状对颗粒再悬浮的影响知之甚少。在本研究中，我们选择了东北地区的6个典型绿化树种，重点研究了四叶性状：粗糙度、接触角、气孔密度和沟槽宽度。风洞用于测量不同风速（1、2、3 m/s）和测试持续时间（10、20、30 分钟）下叶片表面的颗粒再悬浮。随后，我们研究了颗粒再悬浮与叶片性状之间的相关性。结果表明，颗粒重悬浮率最高（61.38%），其次为（58.05%）、（54.21%）、（53.59%）和（50.51%），颗粒重悬浮率最低（32.02%）。测试物种的颗粒重悬浮率范围为（8.24±0.53）×10/s至（2.65±0.51）×10/s，随风速增大而增大，随持续时间延长而减小。随着风速的增加，在避免颗粒再悬浮方面， 和 比 和 更有效。粗糙度和气孔密度与颗粒重悬浮率呈显着负相关，这表明叶面性状可以影响颗粒重悬浮过程。最后，我们的结果表明，影响叶片表面颗粒再悬浮的主要因素是风速、粗糙度和气孔密度，这将为未来研究污染扩散提供科学基础。