Relationship between PM2.5 adsorption and wettability of different trees during summer, autumn in West Mountain of Beijing

doi:10.3969/j.issn.1000-2006.201607040

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2018, Vol. 42 ›› Issue (02): 113-119.doi: 10.3969/j.issn.1000-2006.201607040

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Relationship between PM_2.5 adsorption and wettability of different trees during summer, autumn in West Mountain of Beijing

CHEN Bo¹, JIANG Yan², LU Shaowei^{1,3 Symbolj@@}, LI Shaoning^1,3, Symbol`@@ CHEN Pengfei⁴,LIU Hailong⁴, ZHAO Dongbo⁴

1.Beijing Academy of Forestry and Pomology Sciences, Beijing Yanshan Forest Ecosystem and Observation Station, Beijing 100093, China; 2. College of Ecology and Soil & Water Conservation, Southwest Forestry University, Kunming 650224, China; 3.Beijing Collaborative Innovation Center for Eco-Environmental Improvement with Forestry and Fruit Trees, Beijing 100093, China; 4.Xishan Experimental Forest Farm of Beijing City, Beijing 100093, China

Online:2018-04-12 Published:2018-04-12

Abstract

Abstract: 【Purposes】Beijing, as an international metropolis, has a serious environmental problem. Seasonal difference of PM_2.5 adsorption and its affecting factors between broadleaf trees was observed. It aims to investigate the adsorption mechanism of leaf on PM_2.5among various tree species and support the selection of urban landscaping tree species.【Methods】 Four tree species(Salix babylonica, Acer mono, Ginkgo biloba and Populus spp.)were selected and their accumulation capacity of PM_2.5 were observed in Western Mountainous areas of Beijing. An aerosol generator was used for quantitative determination of PM_2.5 adsorption. We measured contact angel between leaves and water, diiodomethane. Surface free energy and its polar and dispersive component of leaf were calculated based on Owens-Wendt-Kaelble method and Young equation.【Results】The accumulation capacities of leaves on PM_2.5 per leaf area were S. babylonica((0.97±0.46)μg/cm²)>A. mono((0.78±0.39)μg/cm²)>G. biloba((0.69±0.31)μg/cm²)>Populus spp.((0.62±0.21)μg/cm²).The differences of adsorption capacity on PM_2.5 between S. babylonica and G. biloba, Populus spp. were obvious(α=0.05, P<0.05).The adsorption quantity of tree on PM_2.5 in autumn was higher than that in summer. There was a significant relationship between leaf surface wettability(leaf contact angel)and leaf adsorption quantity on PM_2.5(P<0.01).The adsorption of tree on PM_2.5was positively correlated with leaf surface free energy(P<0.05). Its dispersive component had a significant correlation with leaf adsorption quantity on PM_2.5(P<0.01), where as non significant relationship was found with polar free energy. 【Conclusion】 PM_2.5 accumulation capacity among the broadleaf trees: the strongest was S. babylonica and the weakest was Populus spp. Accumulation capacity of them in summer was higher than it in autumn. We can make the plans on city landscape rationally, according to PM_2.5 adsorption characteristics of various tree species, so as to develop the ecological function of urban greenland system.

CLC Number:

S719
X513

CHEN Bo, JIANG Yan, LU Shaowei^{1,3 Symbolj@@}, LI Shaoning, Symbol`@@ CHEN Pengfei,LIU Hailong, ZHAO Dongbo. Relationship between PM_2.5 adsorption and wettability of different trees during summer, autumn in West Mountain of Beijing[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2018, 42(02): 113-119.

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Relationship between PM_2.5 adsorption and wettability of different trees during summer, autumn in West Mountain of Beijing

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