The impact of urban trees on concentrations of PAHs and other gaseous air pollutants in Yanji, northeast China

被引:19
作者
Yli-Pelkonen, Vesa [1 ]
Viippola, Viljami [2 ]
Rantalainen, Anna-Lea [2 ]
Zheng, JunQiang [3 ]
Setala, Heikki [2 ]
机构
[1] Univ Helsinki, Ecosyst & Environm Res Programme, Fac Biol & Environm Sci, POB 65, FI-00014 Helsinki, Finland
[2] Univ Helsinki, Fac Biol & Environm Sci, Ecosyst & Environm Res Programme, Niemenkatu 73, FI-15140 Lahti, Finland
[3] Chinese Acad Sci, Key Lab Forest Ecol & Management, Inst Appl Ecol, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China
关键词
Urban trees; Air pollution; PAHs; Nitrogen dioxide; Ozone; Passive sampling; POLYCYCLIC-AROMATIC-HYDROCARBONS; SEMIPERMEABLE-MEMBRANE DEVICES; NITROGEN-DIOXIDE; ECOSYSTEM SERVICES; NO2; CONCENTRATIONS; O-3; OZONE LEVELS; AMBIENT AIR; POLLUTION; VEGETATION;
D O I
10.1016/j.atmosenv.2018.08.061
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
It is generally conceived that trees can clean polluted air in urban areas sufficiently enough to be considered providers of a vital ecosystem service, although there have not been many field studies showing this in practice in the neighbourhood scale. Using passive sampling methods, we investigated the effect of urban park trees on the concentrations of gaseous polycyclic aromatic hydrocarbons (PAHs), nitrogen dioxide (NO2), ground-level ozone (O-3) and sulfur dioxide (SO2) in early summer in the temperate zone city of Yanji, northeast China. Concentrations of total gaseous PAHs and certain PAH constituents were higher and concentrations of O-3 lower in tree-covered areas compared to nearby open areas, while tree cover did not affect the concentrations of NO2 and SO2. The higher PAH concentrations under tree canopies may associate with air-soil gas exchange and the trapping of polluted air under canopies. Lower O-3 concentrations in tree-covered areas may result from a combination of absorption of O-3 by tree canopies, and lower temperatures and solar radiation under tree canopies compared to open areas.
引用
收藏
页码:151 / 159
页数:9
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