Evaluation of conifer and broad-leaved barriers in intercepting particulate matters in a wind tunnel

Guo, Li; Zhao, Bo; Zhao, Dongsen; Li, Jin; Jin, Tengchuan; Chang, Zhiyong; Liu, Xin

doi:10.1080/10962247.2020.1799883

Cited by 4 publications

(3 citation statements)

References 52 publications

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“…Numerous studies have demonstrated that the roadside plant species can effectively adsorb and remove particulate matter of different sizes, which to a certain extent alleviates the environmental pollution caused by urban transportation 27 – 29 . In our study, P. macrophyllus had the highest retention of total PM, especially much more effective in accumulating large PM particles, which was consistent with previous research 30 – 32 . It has been proved that coniferous species can retain particulate matter more effectively than broadleaf species due to their unique leaf structure and microscopic characteristics.…”

Section: Discussionsupporting

confidence: 93%

“…It has been proved that coniferous species can retain particulate matter more effectively than broadleaf species due to their unique leaf structure and microscopic characteristics. The microstructure of coniferous species is neat "ridged" stripes and well-arranged stomatal strips, with a large number of wrinkles and fluffy structures in the stomatal area, and the size of the fluff is nanoscale, which increases the surface area and surface roughness and is more conducive to the deposition of intercepted particles 30 . Narrow needles may be more easily hit by particles in the air than large flat leaves, compared to flattened leaves, narrow conifer needles have a much larger Stokes number and therefore have higher capture efficiency 31 .…”

Section: Discussionmentioning

confidence: 99%

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Foliar particulate matter retention and toxic trace element accumulation of six roadside plant species in a subtropical city

Chen

Liang

et al. 2023

Sci Rep

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As a major source of air pollution, particulate matter (PM) and associated toxic trace elements pose potentially serious threats to human health and environmental safety. As is known that plants can reduce air PM pollution. However, the relationship between PM of different sizes and toxic trace elements in foliar PM is still unclear. This study was performed to explore the association between PM of different sizes (PM2.5, PM10, PM>10) and toxic trace elements (As, Al, Cu, Zn, Cd, Fe, Pb) as well as the correlation among toxic trace elements of six roadside plant species (Cinnamomum camphora, Osmanthus fragrans, Magnolia grandiflora, Podocarpus macrophyllus, Loropetalum chinense var. rubrum and Pittosporum tobira) in Changsha, Hunan Province, China. Results showed that P. macrophyllus had the highest ability to retain PM, and C. camphora excelled in retaining PM2.5. The combination of P. macrophyllus and C. camphora was highly recommended to be planted in the subtropical city to effectively reduce PM. The toxic trace elements accumulated in foliar PM varied with plant species and PM size. Two-way ANOVA showed that most of the toxic trace elements were significantly influenced by plant species, PM size, and their interactions (P < 0.05). Additionally, linear regression and correlation analyses further demonstrated the homology of most toxic trace elements in foliar PM, i.e., confirming plants as predictors of PM sources as well as environmental monitoring. These findings contribute to urban air pollution control and landscape configuration optimization.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Foliar particulate matter retention and toxic trace element accumulation of six roadside plant species in a subtropical city

Chen

Liang

et al. 2023

Sci Rep

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“…The air is then measured for the concentration of PM both before and after it has passed through the vegetation to quantify the amount of PM that has been removed by the vegetation. However, wind tunnels are typically small-scale and may not accurately reflect real-world conditions [23][24][25]. Despite these limitations, wind tunnels can still provide valuable information about the reduction in airborne particulate matter by vegetation and can be a useful complement to field and computer simulation studies.…”

Section: Introductionmentioning

confidence: 99%

Reduction in Atmospheric Particulate Matter by Green Hedges in a Wind Tunnel

Biocca,

Pochi,

Imperi

et al. 2024

AgriEngineering

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Urban vegetation plays a crucial role in reducing atmospheric particulate matter (PM), modifying microclimates, and improving air quality. This study investigates the impact of a laurel hedge (Laurus nobilis L.) on airborne PM, specifically total suspended particulate (TSP) and respirable particles (PM4) generated by a Diesel tractor engine. Conducted in a wind tunnel of approximately 20 m, the research provides insights into dust deposition under near-real-world conditions, marking, to our knowledge, the first exploration in a wind tunnel of this scale. Potted laurel plants, standing around 2.5 m tall, were arranged to create barriers of three different densities, and air dust concentrations were detected at 1, 4, 9, and 14 m from the plants. The study aimed both to develop an experimental system and to assess the laurel hedge’s ability to reduce atmospheric PM. Results show an overall reduction in air PM concentrations (up to 39%) due to the presence of the hedge. The highest value of dust reduction on respirable particles was caused by the thickest hedge (three rows of plants). However, the data exhibit varying correlations with hedge density. This study provides empirical findings regarding the interaction between dust and vegetation, offering insights for designing effective hedge combinations in terms of size and porosity to mitigate airborne particulate matter.

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Numerical investigation of the blockage effect of trees on airflow distributions in a wind tunnel

Li,

Zhao,

Wang

et al. 2024

Building and Environment

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Evaluation of conifer and broad-leaved barriers in intercepting particulate matters in a wind tunnel

Cited by 4 publications

References 52 publications

Foliar particulate matter retention and toxic trace element accumulation of six roadside plant species in a subtropical city

Foliar particulate matter retention and toxic trace element accumulation of six roadside plant species in a subtropical city

Reduction in Atmospheric Particulate Matter by Green Hedges in a Wind Tunnel

Numerical investigation of the blockage effect of trees on airflow distributions in a wind tunnel

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