Influence of roadside vegetation barriers on air quality inside urban street canyons
Influence of roadside vegetation barriers on air quality inside urban street canyons
复制标题
路边植被屏障对城市街道峡谷内空气质量的影响
DOI：
10.1016/j.ufug.2021.127219
复制
发表时间：
2021-06-16
影响因子：
6.4
通讯作者：
Zhou, Zhixiang
中科院分区：
文献类型：
--
作者：
Chen, Xiaoping;Wang, Xiaoshuang;Zhou, Zhixiang
越来越多的证据表明，暴露于城市街道内的颗粒物（PM）会增加不利的健康风险，而植被屏障有可能改善近路空气质量。为了深入了解植被屏障特性对PMs（TSP，PM10，PM2. 5）扩散的影响，在中国武汉进行了实地测量。在斜风峡谷、道路和路边选取24个样带，在稳定时段同时监测TSP、PM10和PM2. 5浓度。层林带孔隙度被用来代表垂直配置的植被屏障。结果表明，乔、灌、草的植被组合对降低PMs浓度是有效的。在斜风峡谷内，植被屏障可使植被屏障后区域的TSP和PM10浓度降低到一定水平（5类似于23%）。相反，植被屏障对PM2.5的削减作用可能是积极的或消极的是不一致的。Pearson相关分析结果表明，在0 ~ 2 m高度段，TSP和PM10的削减效率与防护林孔隙度呈负相关，而植被屏障指标对PM2. 5的削减效率影响不明显。为改善路边空气质量，应鼓励使用高度低于2米的灌木或树篱，并应避免在交通繁忙的道路周围种植大型密集树木。这些结果为如何通过减轻城市街道峡谷中的PM污染来改善路边空气质量提供了见解。
More evidence has shown that exposure to particulate matter (PMs) within urban streets increases adverse health risks, and vegetation barriers have the potential to improve near-road air quality. To gain insight into the influences of vegetation barrier characteristics on the dispersion of PMs (TSP, PM10, PM2.5), field measurements were performed in Wuhan, China. Twenty-four sample belts were selected within oblique wind canyons, on road and roadside TSP, PM10 and PM2.5 concentration were simultaneously monitored in steady periods. Layer shelterbelt porosity was used to represent the vertical configurations of the vegetation barriers. The result indicated that vegetation combination of trees, shrubs, and herbs is effective for reducing the concentration of PMs. Vegetation barriers can reduce TSP and PM10 concentrations to a certain level (5 similar to 23 %) in the areas behind vegetation barriers compared to the control within oblique wind canyons. In contrast, the reduction effect of the vegetation barrier on PM2.5 could be positive or negative was inconsistent. Pearson correlation analysis results indicated that TSP and PM10 reduction efficiencies were negatively correlated with shelterbelt porosity in the 0 similar to 2 m height section, but the vegetation barrier indicators had no obvious effects on the reduction efficiency of PM2.5. To improve roadside air quality, the use of shrubs or hedges with heights lower than 2 m should be encouraged, and large, dense trees should be avoided around roads with heavy traffic. These results provide insight on how to improve roadside air quality by mitigating PM pollution in urban street canyons.