Institut für Geobotanik, Gottfried Wilhelm Leibniz Universität Hannover, Hanover, Germany.
School of Agriculture, Ningxia University, Yinchuan, Ningxia Hui, China.
Int J Phytoremediation. 2020;22(2):184-200. doi: 10.1080/15226514.2019.1652565. Epub 2019 Aug 27.
Atmospheric particulate matters (PM) caused by urban traffic system put residents' health at serious risk. As a method of phytoremediation to mitigate this risk, roadside plants show significant potential to remove PM from the air. However, the relationship between traffic pressure, height, and leaves' capturing capacity is rarely reported. In this study, two common effective roadside plants () with typical leaf shapes (broad and needle-leaved) were selected to explore the foliage capacity under high, middle and low traffic burden. A green wall covered by was tested to find out the relationship between heights and the amount of accumulated PM. Although the PM capturing capacity varied between different traffic pressures, needle-leaved species generally accumulated more PM than broad-leaved species. For PM capturing, needle-leaved species showed higher capacity under all traffic pressures except under the low traffic pressure. For PM capturing, needle-leaved species accumulated more PM only under the high traffic pressure. Needle-leaved plants were more sensitive to the change of traffic pressures, its PM capturing capacity changed notably between different traffic pressures because its leaf wax is more susceptible to be corroded. Leaf surface contact angle was slightly affected by the change of traffic pressure for broad-leaved species, but for needle-leaved species, it changed greatly. Leaf surface was the main zone for large PM capturing because the large PM was more likely to be stuck in grooves on the leaf surface, while leaf wax was mainly for fine PM absorption because PM with small sizes could adhere to the surface of the wax crystal. By comparing the amount of captured PM by leaf surface of urban roadside plants under different traffic pressures and height ranges, this study optimizes the benefits of roadside plants as traffic-related PM filter under different traffic conditions.
城市交通系统产生的大气颗粒物（PM）严重威胁居民健康。作为减轻这种风险的植物修复方法之一，路边植物具有显著的从空气中去除 PM 的潜力。然而，交通压力、高度和叶片捕捉能力之间的关系很少有报道。在这项研究中，选择了两种常见的有效路边植物（），具有典型的叶片形状（宽叶和针叶），以探索在高、中、低交通负荷下叶片的捕捉能力。用绿色墙壁覆盖），以找出高度与累积 PM 量之间的关系。尽管不同交通压力下的 PM 捕捉能力不同，但针叶树种通常比阔叶树种积累更多的 PM。对于 PM 捕捉，除了低交通压力下，针叶树种在所有交通压力下都表现出更高的能力。对于 PM 捕捉，只有在高交通压力下，针叶树种才会积累更多的 PM。针叶树种对交通压力的变化更敏感，由于其叶片蜡质更容易被腐蚀，其 PM 捕捉能力在不同交通压力之间变化显著。对于阔叶树种，叶表面接触角受交通压力变化的影响较小，但对于针叶树种，叶表面接触角变化较大。叶表面是大 PM 捕捉的主要区域，因为大 PM 更容易卡在叶表面的凹槽中，而叶片蜡质主要用于吸收细小 PM，因为小尺寸的 PM 可以附着在蜡晶表面。通过比较不同交通压力和高度范围内城市路边植物叶片表面捕捉的 PM 量，本研究优化了路边植物作为不同交通条件下与交通相关的 PM 过滤器的效益。
