Seasonal variations in leaf capturing of particulate matter, surface wettability and micromorphology in urban tree species

doi:10.1007/s11783-013-0524-1

Front Envir Sci Eng

2013, Vol. 7

Issue (4) : 579-588 https://doi.org/10.1007/s11783-013-0524-1

RESEARCH ARTICLE

Seasonal variations in leaf capturing of particulate matter, surface wettability and micromorphology in urban tree species

Huixia WANG¹, Hui SHI¹(

), Yangyang LI², Ya YU¹, Jun ZHANG¹

1. School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China; 2. Institute of Soil and Water Conservation, Northwest Science and Technology University of Agriculture and Forestry, Yangling 712100, China

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Abstract

The seasonal changes in leaf particulate matter (PM) accumulation, surface wettability and micromorphology in urban tree species, including Sophora japonica (S. japonica), Platanus acerifolia (P. acerifolia) and Cedrus deodara (C. deodara), were studied during a single growing season. The three species showed distinct seasonal trends in PM accumulation, increasing from spring to autumn (or winter) even during the rainy season, but at different rates. During the study, the leaf PM retention amount of P. acerifolia, a species with ridged leaf surfaces, was significantly higher than that of S. japonica and C. deodara, species with waxy leaf surfaces. The contact angles of water droplets on leaves decreased with leaf age except on the abaxial surface of S. japonica, which remained non-wettable or highly non-wettable throughout the growing season; the decrease in the contact angle on adaxial surface of S. japonica was greater when compared with P. acerifolia and C. deodara. A significant and negative relationship existed between leaf PM retention amounts and contact angles on adaxial surface of leaves of all three species. The increase in wettability, probably caused when epicuticular wax was destroyed by mechanical and chemical abrasion, seemed to be the main factor leading to seasonal variations in leaf PM accumulation.

Keywords contact angle particulate matter retention amount

Corresponding Author(s): SHI Hui,Email:Shihui06@126.com

Issue Date: 01 August 2013

Cite this article:

Huixia WANG,Hui SHI,Yangyang LI, et al. Seasonal variations in leaf capturing of particulate matter, surface wettability and micromorphology in urban tree species[J]. Front Envir Sci Eng, 2013, 7(4): 579-588.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-013-0524-1
https://academic.hep.com.cn/fese/EN/Y2013/V7/I4/579

Tab.1 Leaf habit, leaf shape, surface characteristics, and mean leaf area (±standard deviation, = 30) (cm) for the studied tree species

Fig.1 Seasonal change in leaf contact angles (lines) and PM retention amounts (columns) of (mean±standard deviation)

Fig.2 Seasonal change in leaf contact angles (lines) and PM retention amounts (columns) of (mean±standard deviation)

Fig.3 Seasonal change in leaf contact angles (lines) and PM retention amounts (columns) of (mean±standard deviation)

Fig.4 Scanning electron micrographs of on 26 April ((a) and (b)) and 1 October ((c) and (d)) ((a), (c): adaxial surface; (b), (d): abaxial surface)

Fig.5 Scanning electron micrographs of on 26 April ((a) and (b)) and 1 October ((c) and (d)) ((a), (c): adaxial surface; (b), (d): abaxial surface)

Fig.6 Scanning electron micrographs of on 26 April ((a) and (b)) and 1 October ((c) and (d)) ((a), (c): adaxial surface; (b), (d): abaxial surface)

Fig.7 Correlation between contact angles on adaxial surfaces and PM retention amounts

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