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Regional differences in the flowering phenology of plants in Beijing based on airborne pollen data

SUN Aizhi1,2, WU Shuangshuang1, 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, 101408, China;
    2 Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing 100049, China;
    3 Beijing Meteorological Service Center, Beijing 100097, China
  • Received:2022-09-08 Revised:2023-02-17 Online:2023-03-21

Abstract: Airborne pollen is one of strong corroboration of phenological events at different spatial and temporal latitudes. Airborne pollen was collected from March 1 to May 31, 2020 using umbrella pollen samplers at two research sites in Beijing (Huairou District, Shijingshan District), with the aim of studying the regional characteristics of flowering phenology of spring flowering plants from the perspective of airborne pollen, and analyzing the relationship between first flowering time, flowering duration of plants and temperature. The results showed that:(1) there were some regional differences in the airborne pollen types and content between Huairou and Shijingshan districts. The airborne pollen in Huairou District belonged to 18 families and genera, with the highest content Cupressaceae (65%) pollen, followed by Populus, Pinus, Ulmus, Rosaceae. The airborne pollen in Shijingshan District belonged to 16 families and genera, with Cupressaceae pollen dominating (41%) but lower than that in Huairou District, followed by Fabaceae, Ulmus and Oleaceae. (2) There are some differences in the first flowering time and flowering duration of spring flowering plants in two areas. The first flowering times in Shijingshan District, which exhibits higher spring temperatures, are earlier than that in Huairou District, except for Populus (2 days later), which is 2-16 days earlier, with an average of about 7 days. (3) Airborne pollen monitoring data indicate that the first flowering time of spring flowering plants also showed a clear trend of advancement with increasing temperatures in different periods in the same area. These results are basically consistent with the previous results based on plant phenology observation, which indicates that the monitoring results of airborne pollen can also reflect the time the state of plant flowering phenology, and can provide a multi-disciplinary supplement and reference for the study of plant flowering phenology.

Key words: Airborne Pollen, First Flowering, Flowering duration, Huairou District, Shijingshan District

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