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Assessing the Particulate Matter Removal Abilities of Tree Leaves
Published on: October 7, 2018
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Size distribution of particulate matter in runoff from different leaf surfaces during controlled rainfall processes
Xiaowu Xu1, Xinxiao Yu2, Le Bao2
1Beijing Laboratory of Urban and Rural Ecological Environment, Beijing Forestry University, Beijing, China; Department of Atmospheric and Oceanic Sciences, University of Wisconsin, Madison, WI, United States.
Environmental Pollution (Barking, Essex : 1987)
|September 22, 2019
Summary
Plant leaves reduce particulate matter (PM) but require rain for renewal. This study shows how rainfall washes off different sized PM from various plant species, aiding urban greening strategies.
Area of Science:
- Environmental Science
- Plant Biology
- Atmospheric Science
Background:
- Plant leaves mitigate health risks by reducing atmospheric particulate matter (PM).
- Leaf PM accumulation capacity is limited without runoff, necessitating renewal mechanisms.
- Rainfall effectively removes PM from leaves, restoring accumulation capacity.
Purpose of the Study:
- To investigate how size-fractioned particulate matter (PM) is washed off plant leaves by rainfall.
- To understand the variation in PM wash-off across different plant species and PM sizes.
- To inform urban greening strategies for effective PM management.
Main Methods:
- Utilized artificial rainfall experiments on six different plant species.
- Measured wash-off of size-fractioned particulate matter (fine, coarse, large).
- Analyzed the influence of rainfall intensity and duration on PM wash-off.
Main Results:
- Total wash-off masses varied significantly by PM size fraction (fine: 0.6-10.3 μg/cm², coarse: 1.0-18.8 μg/cm², large: 4.5-60.1 μg/cm²).
- Cupressus orientalis and Elaeagnus japonicus showed the highest wash-off masses per fraction; Prunus cerasifera exhibited the highest cumulative wash-off rates.
- Rainfall intensity impacted wash-off of large particles across all species and small particles in evergreens, while wash-off proportions shifted with rainfall duration.
Conclusions:
- Plant species and PM size significantly influence rainfall-mediated PM removal.
- Understanding these dynamics is crucial for optimizing plant selection in urban greening for air quality improvement.
- Results provide valuable data for managing PM accumulation and renewal on urban vegetation.
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