SCIENTIA GEOGRAPHICA SINICA ›› 2023, Vol. 43 ›› Issue (4): 737-744.doi: 10.13249/j.cnki.sgs.2023.04.017

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Characteristics of airborne pollen types and concentrations in the north of Beijing, China

Sun Aizhi1(), Zhang Haihong2, Li Xueyin1, Ye Caihua3   

  1. 1. College of Earth and Planetary Sciences/Beijing Yanshan Earth Critical Zone National Research Station, University of Chinese Academy of Sciences, Beijing 100049, China
    2. Beijing Huairou Hospital, Beijing 101499, China
    3. Beijing Meteorological Service Center, Beijing 100097, China
  • Received:2022-01-05 Revised:2022-05-12 Online:2023-04-30 Published:2023-04-20
  • Supported by:
    Beijing Natural Science Foundation(8212038);Science & Technology Fundamental Resources Investigation Program(2022FY100103);Fundamental Research Funds for the Central Universities

Abstract:

Airborne pollen is considered to be one of the air pollutants that can cause allergic reactions in humans, then leading to the occurrence or aggravation of a series of allergic diseases. The latest study showed that the positive rate of pollen allergens in allergic rhinitis patients in urban areas of Beijing is as high as 84.3%. However, due to the differences in climatic conditions, vegetation types and plant species in different regions, the types and amount of airborne pollen are also different. Therefore, research on airborne pollen needs to be conducted in different regions. In this study, we analyzed the characteristics of airborne pollen types and concentration variations by monitoring in the north of Beijing from 1 March to 15 October 2020. The results show that: 1) The pollen season in the north of Beijing in 2020 started from 15 March (2.5% of the total annual amount) to 5 September (97.5% of the total annual amount), covering 172 days, accounting for 47.0% of the total days of the year. Among them, the days with pollen concentrations higher than 25 grains/1 000 mm2, 50 grains/1 000 mm2, 100 grains/1 000 mm2, 200 grains/1 000 mm2, 500 grains/1 000 mm2, and 1 000 grains/1 000 mm2 were 142 d, 124 d, 97 d, 73 d, 38 d, and 10 d, respectively. 2) A total of 20 pollen types were observed, among which the percentage of Cupressaceae pollen is the highest at 57.3%, followed by Moraceae (7.8%), Populus (6.6%), Pinus (6.1%), Ulmus (4.3%), Artemisia (3.9%), Rosaceae (3.6%), Betula (2.9%), Chenopodiaceae (1.7%). This is mainly because the plant species distributed in this study area are mainly trees and shrubs, especially the Cupressaceae, Salicaceae and Pinaceae, which have more higher pollen production. 3) The total concentration of airborne pollen changes significantly and exhibits a bimodal pattern, that is, March to May is the first peak (mainly tree pollen, such as Cupressaceae, Populus, Salix and Ulmus); August to September is the second peak (mainly herbaceous pollen, such as Artemisia, Chenopodiaceae and Poaceae). Pollen concentration from June to July is the lowest, all below 50 grains/1 000 mm2. The study of airborne pollen types, concentration changes and seasonal variation in the north of Beijing provides first-hand scientific data for guiding the prevention of pollinosis patients and building a healthy urban environment.

Key words: airborne pollen, pollen monitoring, seasonal characteristics of pollen concentration, the north of Beijing

CLC Number: 

  • Q948.12+2.6