Removal of atmospheric particles by leaves and twigs of urban trees: Some preliminary observations and assessment of research needs

Smith, William H.; Staskawicz, Brian J.

doi:10.1007/bf01865859

Cited by 45 publications

(22 citation statements)

References 49 publications

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“…The effect of relative humidity on PM2.5 is mainly reflected in the processes of nucleation and coagulation. The fundamental effect of humidity on deposition is because particles are mainly hygroscopic, and their size varies as a result of the absorption or discharge of water [30,41,42]. An increase in relative humidity causes an increase in the airborne PM2.5 concentration.…”

Section: Effect Of Climatic Conditions On Pm25 Concentrationmentioning

confidence: 99%

PM2.5 Concentration Differences between Various Forest Types and Its Correlation with Forest Structure

Liu

Zhang

2015

Atmosphere

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Abstract:The Plain Forestation Project is an important measure designed to alleviate air pollution in Beijing, the capital of China. Ten commonly cultivated forest types of the Plain Forestation Project were studied at three growth stages of leaves. The particulate matter (PM)2.5 concentrations and forest structures were surveyed to analyze the PM2.5 concentration differences between different forest types, and establish a linear relationship between forest structures and PM2.5 concentration differences. The results suggested that forest ecosystems can block and capture PM2.5 from the air. Forests with luxuriant foliage are most effective in removing PM2.5 from the air. The average PM2.5 mass concentration in the Leaf-on Period (LOP) was the lowest when compared with other periods. The PM2.5 concentrations in the forest usually were higher than the control. Correspondingly, PM2.5 concentration indexes were negative values during daytime, but this results were reversed at night. Forests can reduce the diffusion rate of PM2.5 leading to PM2.5 were detained in the forest during daytime, and play an important role in the adsorption or deposition of particulate matter at night. Forest structure was primary reason of the PM2.5 concentration difference between different forests. The PM2.5 concentration index was positively correlated to canopy density, leaf area index (LAI), and mean diameter at breast height (DBH), and negatively correlated to the average tree height (height), forestland area, grass coverage and height.

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Section: Effect Of Climatic Conditions On Pm25 Concentrationmentioning

confidence: 99%

PM2.5 Concentration Differences between Various Forest Types and Its Correlation with Forest Structure

Liu

Zhang

2015

Atmosphere

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“…미세먼지 제거 효과가 입증되었다 (Lohr and Pearson-Mims, 1996). 노르웨이와 폴란드의 야외에서 22종의 교목과 25종 의 관목을 대상으로 잎에 축적되는 미세먼지의 양은 각 식 물의 잎에 위치한 섬모와 왁스층의 차이에 따라 10-15배의 차이가 있었고 (Saebø et al, 2012), 도심 지역의 교목은 잎의 면적, 섬모뿐만 아니라 교목에 서식하는 균사체에 의해서도 미세먼지를 흡착하는 것으로 알려졌다 (Smith and Staskawicz, 1977). 미세먼지 입자의 크기(3-180μm)별로 6등급을 나누어 실시된 잔디 등의 야외 초본식물에 대한 미세먼지 축적량 조사에서도 식물별로 차이는 있지만 상당량의 미세먼지를 흡착하는 것으로 보고되었다 (Weber et al, 2014).…”

Section: 실내식물의 오염물질 제거는 지상부와 지하부 모두에서unclassified

Stabilization of Soil Moisture and Improvement of Indoor Air Quality by a Plant-Biofilter Integration System

Lee¹,

Choi²,

Chun³

2015

HST

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This study was performed to investigate the stability of soil moisture in controlling air ventilation rate within a horizontal biofilter, and to compare removal efficiency (RE) of indoor air pollutants including fine dust, volatile organic compounds (VOCs), and formaldehyde (HCHO), depending on whether dieffenbachias (Diffenbachia amoena) were planted in the biofilter. The relative humidity, air temperature, and soil moisture contents showed stable values, regardless of the presence of D. amoena, and the plants grew normally in the biofilter. REs for number of fine dust particles (PM10 and PM2.5) within the biofilter filled with only soil were at least 30% and 2%, respectively. REs for number of fine dust particles (PM10 and PM2.5) within the biofilter including the plants were above 40% and 4%, respectively. RE for fine dust (PM10) weight was above 4% and 20%, respectively, in the biofilter containing only soil or soil together with plants. In the case of the biofilter filled with only soil, REs for xylene, ethylbenzene, toluene or total VOC (T-VOC) were each more than 63%; however, REs for benzene and formaldehyde (HCHO) were above 22% and 38%, respectively. In the biofilter with the plants, REs for xylene, ethylbenzene, toluene, and T-VOC were each above 72%, and REs for benzene and HCHO were above 39%. Thus, RE of the biofilter integrated with plants was found to be higher for volatile organic compounds than for fine dust. Hence, the biofilter was very effective for indoor air quality improvement and the effect was higher when integrated with plants.

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“…Various studies have found that leaf surfaces are the main deposition area for aerosol particles from the atmosphere, based on chemical analysis and scanning electron microscopy (SEM) (e.g., Lindberg et al, 1982;Smith and Staskawicz, 1977;Watanabe et al, 2013). SEM observations showed that the distribution of these fine particles on the leaf surface was heterogeneous (Lindberg et al, 1982); this is because the leaf surface has heterogeneous structures such as trichomes and epicuticular waxes.…”

Section: Leaf Surface Structure (Micro-roughness)mentioning

confidence: 99%

“…In the field, Beckett et al (2000a) examined the particles captured on leaf surfaces of three broad-leaves tree species growing in an urban park and found that the species with a rough hairy leaf surface captured the most particles. SEM observation has revealed that, in an urban area, trichomes of tree leaves capture many particles (Smith and Staskawicz, 1977;Ram et al, 2012). Trichomes would enhance the particle capture efficiency of leaves.…”

Section: Trichomesmentioning

confidence: 99%

“…In urban areas, fine metal particles such as Pb, carbon particles, and soil particles were detected on the surfaces of tree leaves (Lorenziní et al, 2006;Ram et al, 2012;Smith and Staskawicz, 1977;Tomašević et al, 2005). Watanabe et al (2013) and Watanabe et al (2014) found soil particles and fine particles including S, Ca, Na and Cl in an urban area in Sapporo in northern Japan.…”

Section: Chemical Components Of Aerosols On the Leaf Surface Of Treesmentioning

confidence: 99%

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Canopy, leaf surface structure and tree phenology: Arboreal factors influencing aerosol deposition in forests

Watanabe

2015

J. Agric. Meteorol.

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In determining the effect of aerosols on forest trees, it is necessary to estimate the deposition of aerosols to forests. To this end we must consider the arboreal factors that influence the deposition of aerosols on forest trees. This paper examines such relevant factors as canopy shape, shoot structure, and leaf surface structures. Laboratory and field experiments in urban areas show that these factors play an important role in the deposition of aerosols on trees. SEM-EDX analyses have determined the chemical composition of particles deposited on the surfaces of tree leaves in urban areas. In forests, however, details of aerosol particles deposited on leaf surfaces is not known, and the effect of abiotic factors such as rainfall, fog and wind has not been determined. Further information is needed, including experimental data about the aerosols deposited on leaf surfaces of trees in a forest, taking into account canopy shape, leaf surface structures and tree phenology.

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Removal of atmospheric particles by leaves and twigs of urban trees: Some preliminary observations and assessment of research needs

Cited by 45 publications

References 49 publications

PM2.5 Concentration Differences between Various Forest Types and Its Correlation with Forest Structure

PM2.5 Concentration Differences between Various Forest Types and Its Correlation with Forest Structure

Stabilization of Soil Moisture and Improvement of Indoor Air Quality by a Plant-Biofilter Integration System

Canopy, leaf surface structure and tree phenology: Arboreal factors influencing aerosol deposition in forests

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