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Bulletin of Botanical Research ›› 2019, Vol. 39 ›› Issue (3): 471-480.doi: 10.7525/j.issn.1673-5102.2019.03.018

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Effect of Urban Greening on Air Quality ——Take 27 Provincial Capitals in China as an Example

ZHANG Jing-Hua1, TIAN Pan-Li1, LIU Xiao1, YANG Yang1, WANG Ke1, WANG Wen-Jie1,2   

  1. 1. Kay Laboratory of Forest Plant Ecology, Northeast Forestry University, Harbin 150040;
    2. Urban Forest and Wetland Research Group, Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Changchun 130102
  • Received:2018-12-28 Online:2019-05-05 Published:2019-05-11
  • Supported by:
    The National Natural Science Foundation of China(31670699,41730641);Basic research funds for national universities from Ministry of Education of China(2572017DG04);Longjiang Scholars support Program (T201702)

Abstract: The comparison of urban greening-viewing degree, air pollution and their and related differences analysis are important prerequisites for urban environmental management measures. We selected 27 provincial capital cities of China and measured street-view urban green viewing index based on the network street photo for comparing the main air quality indicators, including air quality index(AQI), fine particulate matter(PM2.5), respirable particulate matter(PM10), sulfur dioxide(SO2), nitrogen dioxide(NO2), ozone(O3) and carbon monoxide(CO). Based on these data, the related relationship is discussed between the urban green viewing index and air quality indicators. The aiming is to provide a basis for enhancing environmental quality and improving greening levels. Results showed that:(1)Jinan and Chongqing have the highest green index, reaching 11.70% and 11.55%, respectively. The green index of Hohhot and Lhasa city is the lowest, ranging in 4%-5%. (2)The city with the best air quality is located in Haikou, with AQI of 39.66. The air quality of Zhengzhou and Jinan is the worst. The average annual AQI values are 117.34 and 113.93, respectively. However, according to different air indicators, the order of these cities is quite different. For example, the lowest average annual cities of the lowest PM2.5, PM10, NO2 and SO2 are Haikou. Lhasa has the lowest annual average CO content(CO is 0.55 mg·m-3). While the lowest O3 content(77.08 μg·m-3) is in Harbin. (3)Correlation analysis found that the air quality of some cities is improved with increasing the green level, such as Shenyang, Nanning, Hefei, etc. On the other hand, but they also have a significant positive correlation for some cities, including Lanzhou, Kunming, and Guiyang, meaning that the greener level of is increasing air pollution in these cities. (4)Although many studies have shown that urban green vegetation can play the role of dust retention and pollution reduction, the current level of air pollution in major cities in China is far from enough to rely on urban greening improvement. Even green vegetation hinders air circulation in some cities. The above research results provide basic data support for scientific planning urban greening and improving air quality.

Key words: inter-city comparison, urban forest and greening, green viewing index, air quality index, coupling relation

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