气候变化领域集成服务门户(CCPortal): Canopy density effects on particulate matter attenuation coefficients in street canyons during summer in the Wuhan metropolitan area

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DOI	10.1016/j.atmosenv.2020.117739
	Canopy density effects on particulate matter attenuation coefficients in street canyons during summer in the Wuhan metropolitan area
	Wang X.; Teng M.; Huang C.; Zhou Z.; Chen X.; Xiang Y.
发表日期	2020
ISSN	13522310
卷号	240
英文摘要	Changes in vegetation traits influence the particulate pollution mitigating effects of trees in street canyons; however, it remains unclear whether tree canopy density (i.e. the proportion of the street floor covered by the vertical projection of the tree canopy) promotes or reduces this effect. A 12-day field experiment was conducted in four representative street canyons to examine the mitigating effects of street trees on particulate matter (PM) for PM1, PM2.5, PM4, PM7, PM10, and total suspended particles (TSP) among four canopy density treatments, including (1) open spaces and areas with (2) sparse (≤35%), (3) medium (35–70%) and (4) dense (≥70%) canopy densities. The results showed that canopy density is the dominant vegetation trait that affects PM dispersion, with peak decreases occurring at a canopy density of ~30%. The particulate matter attenuation coefficient (PMAC) indicates the PM reduction capability of trees. The PMAC of each particle size class correlated negatively with canopy density and TSP (<100 μm) showed the greatest attenuation. In relation to open space treatment, a canopy density range 30–36% showed the largest reductions in the PM10 and TSP concentrations of 26.75% and 27.49%, respectively. And for the PM2.5 concentration, a canopy density range 24–36% exhibited the largest reduction (7.44%). It was also concluded that sparse canopy density is optimal for trees in areas with high PM concentration. Medium canopy density also promotes pollutant dispersion (especially PM2.5), while dense canopy density causes air quality deterioration. This study will provide new insights into the response of atmospheric PM spatial dispersion to the characteristics of tree cover in street canyons, as well as the regulation mechanism of this response. By investigating this issue under different scenarios, this study aims to contribute to the quantitative tree planting design in urban planning. © 2020 Elsevier Ltd
英文关键词	Air pollution; Dispersion; PM2.5; Roadside tree; Street canyons
语种	英语
scopus关键词	AC motors; Air quality; Deterioration; Particle size; Reforestation; Urban planning; Vegetation; Attenuation coefficient; Particulate pollution; PM2.5 concentration; Pollutant dispersions; Quality deteriorations; Regulation mechanisms; Total suspended particles; Vertical projection; Particles (particulate matter); air quality; canopy; concentration (composition); metropolitan area; open space; particulate matter; pollution control; street canyon; summer; tree planting; urban planning; air pollution; air quality; article; canopy; city planning; deterioration; field experiment; particle size; particulate matter; pollutant; summer; vegetation; China; Hubei; Wuhan
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144989
作者单位	College of Horticulture and Forestry Sciences, Key Laboratory of Urban Agriculture in Central China Ministry of Agriculture, Hubei Engineering Technology Research Center for Forestry Information, Huazhong Agricultural University, Wuhan, 430070, China; School of Geography and Information Engineering, China University of Geosciences, Wuhan, 430074, China; College of Urban and Rural Construction, Shanxi Agriculture University, Shanxi Taigu, 030801, China
推荐引用方式 GB/T 7714	Wang X.,Teng M.,Huang C.,et al. Canopy density effects on particulate matter attenuation coefficients in street canyons during summer in the Wuhan metropolitan area[J],2020,240.
APA	Wang X.,Teng M.,Huang C.,Zhou Z.,Chen X.,&Xiang Y..(2020).Canopy density effects on particulate matter attenuation coefficients in street canyons during summer in the Wuhan metropolitan area.Atmospheric Environment,240.
MLA	Wang X.,et al."Canopy density effects on particulate matter attenuation coefficients in street canyons during summer in the Wuhan metropolitan area".Atmospheric Environment 240(2020).