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Particulate matter deposited on leaf of five evergreen species in Beijing, China: Source identification and size distribution
Abstract Airborne particulate matter (PM) has become a serious problem, and urban plants can play important roles in reducing PM concentrations in the air. The morphology, size, and elemental composition of PM on tree leaves (five evergreen species) from Beijing, China, were obtained, together with number density of PM size fraction, by using scanning electron microscopy (SEM) and energy dispersive X-rays (EDX). The rinse and weigh method was used to characterize PM in three size categories (0.2–2.5 μm, 2.5–10 μm, and 10–100 μm). The results showed that PM up to 2 μm can get into the stomatal cavity, and the most furrowed areas of the leaf surfaces were sites of maximum PM deposition. The leaf-deposited PM mainly comprised C, O, Si, and Fe. The number of particles per leaf per cm2 was 1.95 × 107, and 96% of the particles were less than 2.5 μm. The mass concentration was 148.44 μg/cm2, and PM2.5 comprised only 2.09% by weight while PM larger than 10 μm comprised 79%. Juniperus formosana was most effective at mitigating airborne PM on the leaf scale. Pinus bungeana accumulated the most PM on the tree scale. The results showed that urban plants can play important roles in mitigating urban airborne PM.
Graphical abstract Display Omitted
Highlights By SEM and EDX, we found PM on leaf surface mainly come from natural source. The number density and mass quality of particles per leaf square centimeter were compared between species. On leaf scale, the Juniperus formosana accumulated most PM for its complex leaf structure. For one tree, Pinus bungeana, with the most leaf area, was most effective at mitigating airborne PM.
Particulate matter deposited on leaf of five evergreen species in Beijing, China: Source identification and size distribution
Abstract Airborne particulate matter (PM) has become a serious problem, and urban plants can play important roles in reducing PM concentrations in the air. The morphology, size, and elemental composition of PM on tree leaves (five evergreen species) from Beijing, China, were obtained, together with number density of PM size fraction, by using scanning electron microscopy (SEM) and energy dispersive X-rays (EDX). The rinse and weigh method was used to characterize PM in three size categories (0.2–2.5 μm, 2.5–10 μm, and 10–100 μm). The results showed that PM up to 2 μm can get into the stomatal cavity, and the most furrowed areas of the leaf surfaces were sites of maximum PM deposition. The leaf-deposited PM mainly comprised C, O, Si, and Fe. The number of particles per leaf per cm2 was 1.95 × 107, and 96% of the particles were less than 2.5 μm. The mass concentration was 148.44 μg/cm2, and PM2.5 comprised only 2.09% by weight while PM larger than 10 μm comprised 79%. Juniperus formosana was most effective at mitigating airborne PM on the leaf scale. Pinus bungeana accumulated the most PM on the tree scale. The results showed that urban plants can play important roles in mitigating urban airborne PM.
Graphical abstract Display Omitted
Highlights By SEM and EDX, we found PM on leaf surface mainly come from natural source. The number density and mass quality of particles per leaf square centimeter were compared between species. On leaf scale, the Juniperus formosana accumulated most PM for its complex leaf structure. For one tree, Pinus bungeana, with the most leaf area, was most effective at mitigating airborne PM.
Particulate matter deposited on leaf of five evergreen species in Beijing, China: Source identification and size distribution
Song, Yingshi (author) / Maher, Barbara A. (author) / Li, Feng (author) / Wang, Xiaoke (author) / Sun, Xiao (author) / Zhang, Hongxing (author)
Atmospheric Environment ; 105 ; 53-60
2015-01-14
8 pages
Article (Journal)
Electronic Resource
English
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