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Particle removal by vegetation: comparison in a forest and a wetland

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Abstract

Vegetation collection is one of the most effective scavenging methods but relevant studies are limited. It can be described by some abstract parameters such as collection rates and deposition fluxes within the canopy. In order to estimate the dry deposition within the canopy of particular matters (PMs) in Beijing, a highly particle-polluted city, and reveal the PM pollution-removal abilities of plants in wetlands and forests, concentration and meteorological data were collected during the daytime in an artificial forest and a wetland in the Olympic Park in Beijing. The dry depositions within the canopy and vegetation collection rates were calculated by a well-developed model and validated by measured deposition fluxes in 11 random experiment days. The experiment year was divided into three plant growth stages based on canopy density, and the day was divided into four different times. Two heights, 10 and 1.5 m, were defined in the forest while in the wetland, 0.5 and 1.5 m were defined. The results showed that in Beijing, the most severe pollution by PMs occurs in the non-leaf stage (NS), and the full-leaf stage (FS) is the cleanest stage. In NS, namely winter, more fossil fuel was used for worms in Beijing and peripheral areas and this might be the reason for the serious pollution condition. Within the canopy, PM deposition fluxes in the wetland are more than those in the forest, but the vegetation collection rates of the forest are higher. The lower temperature conditions led to more dry deposition, and the larger canopy contributed to the higher collection rates. During the daytime, over the year, the deposition of PM10 in three plant growth stages is NS ≥ half-leaf stages (HS) ≥ FS, whereas the deposition of PM2.5 is NS ≥ FS ≥ HS, and during the daytime, the maximum deposition fluxes occur in 6:00–9:00 in the wetland while the minimum deposition values occur in 15:00–18:00. This phenomenon was related to the temporal variation of particle concentration.

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Abbreviations

PM:

particulate matter

NS:

No-leaf stage

HS:

Half-leaf stage

FS:

Full-leaf stage

PM2.5 :

Particles with diameter smaller the 2.5 μm

PM10 :

Particles with diameter between 2.5 and 10 μm

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Acknowledgments

This research was supported by the Fundamental Research Funds for the Central Universities (2016JX05), Forestry Public Welfare Projects Special Fund of China (201304301), and Beijing Municipal Science and Technology Project (Z141100006014031).

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Correspondence to Zhenming Zhang.

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Communicated by: Gerhard Lammel

Jiakai Liu and Jiexiu Zhai contributed equally to this work.

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Liu, J., Zhai, J., Zhu, L. et al. Particle removal by vegetation: comparison in a forest and a wetland. Environ Sci Pollut Res 24, 1597–1607 (2017). https://doi.org/10.1007/s11356-016-7790-y

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  • DOI: https://doi.org/10.1007/s11356-016-7790-y

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