Factors influencing the concentration of negative air ions during the year in forests and urban green spaces of the Dape
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ORIGINAL PAPER
Factors influencing the concentration of negative air ions during the year in forests and urban green spaces of the Dapeng Peninsula in Shenzhen, China Yafei Wang1,2 · Zhuobiao Ni1,2 · Di Wu1,2 · Chen Fan3 · Jiaqi Lu1,3 · Beicheng Xia1,2
Received: 1 November 2018 / Accepted: 1 July 2019 © Northeast Forestry University 2019
Abstract Negative air ions (NAIs) benefit the mental and physical health of humans, but rapid urbanization can decrease the abundance of NAIs. Quantifying the spatial and seasonal distribution of NAIs and determining the factors that influence the concentration during urbanization is thus essential. In the present study of a typical developing urban district in southern China, negative air ion concentrations (NAICs) in 60 forests sites and 30 urban green spaces were quantified on seven consecutive days in each of the four seasons. Large seasonal variations in NAIC were revealed in forests and urban green spaces with trough values in summer. NAIC progressively decreased from forests to urban green spaces and was influenced by local land morphology, vegetation characteristics, and climatic factors. The vast, Project funding: This research was financially supported by the National Key R&D Program of China (2016YFC0502803), the National Natural Science Foundation of China (41701598, 41703071), Natural Science Foundation of Guangdong Province, China (No. 2017A030310532), Research Funds for the Central Universities (No. 17lgpy92) and Urban Management & Water Bureau of Dapeng New District, Shenzhen (DPCG2016124934). The online version is available at http://www.springerlink.com. Corresponding editor: Yanbo Hu. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11676-019-01047-z) contains supplementary material, which is available to authorized users. * Zhuobiao Ni [email protected] Beicheng Xia [email protected] 1
School of Environmental Science and Engineering, Sun Yat-sen University, 135 Xingang Xi Road, Guangzhou 510275, People’s Republic of China
heavily vegetated northeastern region was the richest area for NAIs, whereas the narrow central region (urbanized area) was the poorest, implying dramatic impacts of urbanization on the spatial distribution of NAIs. The relationship between air temperature and NAIC was better fitted with a quadratic equation than a linear equation. Moreover, the NAIC was more sensitive to local morphology in urban green spaces than in urban forests, indicating the vulnerability of NAIs in urbanized areas. Therefore, the appropriate design of local urban morphology is critical. Keywords Forests · Negative air ion concentration · Urban green spaces · Shenzhen
Introduction Negative air ions (NAIs) can absorb dust particles (Daniell et al. 1991), reduce fog and smoke (Fletcher et al. 2007; Sawant et al. 2012), and decrease bacteria and pollen (Kawamoto et al. 2006; Fletcher et al. 2007). Importantly, several studies have shown that exposure to negative air ions can prevent and cure respir
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