The variation and main influencing factors of negative air ions in urban plantation

GUAN Beibei, ZHENG Sijun, CUI Xinhong

Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2016, Vol. 40 ›› Issue (01) : 73-79.

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南京林业大学学报（自然科学版）
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Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2016, Vol. 40 ›› Issue (01) : 73-79. DOI: 10.3969/j.issn.1000-2006.2016.01.012

The variation and main influencing factors of negative air ions in urban plantation

  • GUAN Beibei1, ZHENG Sijun2, CUI Xinhong1,2*
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Abstract

Due to the instantaneity of negative air ions(NAI), the intermittent monitoring of one hour or two hours was difficult to accurately reflect the trends of NAI. In order to obtain the realtime trend of NAI and the key affecting factors, five different types of plantation forest in Chongming island of Shanghai City were chosen for realtime monitoring of NAI along with environmental factors. The results showed that: the daily variation of NAI concentration(NAIC)was bimodal, but the time of the peak value depended on the dominant tree species. Moreover, NAIC was also influenced by season, the mean values order of NAIC in different season was summer((1 476±17.1)ions/cm3)>winter((1 310±25.2)ions/cm3)>spring((1 197±12.6)ions/cm3)>autumn((1 089±12.7)ions/cm3), and the order in different plantation forest was Taxodium ascendens forest((1 405±16.5)ions/cm3)>mixed forest((1 269±18.1)ions/cm3)>Ailanthus altissima forest((1 259±23.2)ions/cm3)>Metasequoia glyptostroboides forest((1 257±21.0)ions/cm3)>Cinnamomum camphor forest((1 093±16.6)ions/cm3). The correlation analysis showed that, a positive correlation was presented between NAI and tree height as well as relative humidity. A negatine ralationship was found between NAI and temperature as well as wind speed. These was positive correlation between NAI and light intensity when the light intensity was less than 20 000 lx. By principal component analysis, the relative humidity and light intensity were the main factors affecting NAI. In addition, plant photosynthesis was found to be an important factor for the similar daily variation curve of NAI and photosynthesis of dominant tree species.

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GUAN Beibei, ZHENG Sijun, CUI Xinhong. The variation and main influencing factors of negative air ions in urban plantation[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2016, 40(01): 73-79 https://doi.org/10.3969/j.issn.1000-2006.2016.01.012

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