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Chinese Journal of Applied Ecology ›› 2019, Vol. 30 ›› Issue (2): 503-510.doi: 10.13287/j.1001-9332.201902.003

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PM2.5 adsorption capacity of Osmanthus fragrans and Cinnamomum camphora leaf surface and influencing factors under different pollution levels in Changsha, China.

LUO Jia1,2,3, ZHOU Xiao-ling1,3*, TIAN Yu-xin1,3, CHEN Jian-hua2   

  1. 1Hunan Forestry Academy, Changsha 410004, China;
    2Central South University of Forestry and Technology, Changsha 410004, China;
    3Hunan Cili Forest Ecosystem State Research Station, Cili 427200, Hunan, China
  • Received:2018-07-27 Revised:2018-11-01 Online:2019-02-20 Published:2019-02-20
  • Supported by:
    This work was supported by the Natural Science Foundation of Hunan Province (2017JJ3151), the Changsha Science and Technology Project (kq1706029), the Project of Forestry Science and Technology of Hunan Province (XKL201704, XLKPT201710, XKL201701-2), the Key R & D Projects of Hunan Province (2017NK2223) and the National Science and Technology Project in Rural Areas in 12th Five-Year (2015BAD07B04).

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Abstract: To understand the PM2.5 adsorption mechanisms of plants under different pollution levels and analyze pollutant sources, the PM2.5 adsorption amount of the leaves of two garden plant species (Cinnamomum camphora and Osmanthus fragrans) in different polluted level area (traffic area, culture and education area, cleaning area) of Changsha was measured using an aerosol generator. AFM scanning was used to obtain leaf surface micromorphological characteristics. Ion chromatography was used to measure the water-soluble ion content. Results showed that amount of PM2.5 adsorbed by leaves was positively correlated with pollution levels. The annual mean value of PM2.5adsorbed per leaf area of different plants was traffic area (0.56±0.04 μg·cm-2) > culture and education are (0.48±0.06 μg·cm-2) > clearing area (0.33±0.02 μg·cm-2). The season with amount of PM2.5adsorbed in leaves from the highest to lowest was winter (0.70±0.10 μg·cm-2) > spring (0.43±0.14 μg·cm-2) > autumn (0.39±0.12 μg·cm-2) > summer (0.31±0.09 μg·cm-2). Osmanthus fragrans had higher capacity to absorb PM2.5 than Cinnamomum camphora. Leaves of plants grown in low pollution areas were relatively smooth, whereas those in high pollution areas were rough. The order of leaf roughness in both species from high to low was traffic area (195.45±16.09 nm) > culture and education area (176.99±8.45 nm) > cleaning area (131.88±12.98 nm). The PM2.5 ionic content was the highest in winter, intermediated in spring and autumn, and the lowest in summer. The PM2.5 ions mainly included Na+, NH4+, Cl- and Br- in three pollution areas. PM2.5 pollution was due to removable source pollution at different pollution levels.

Key words: pollution degree, leaf surface morphology, PM25 adsorption amount, water-soluble ionic characteristics