2012/07/30 by Łukasz Grewling, Bogdan Jackowiak, Małgorzata Nowak +3
Agricultural and Biological Sciences · Medicine · #Allergic Rhinitis and Sensitization #Botany and Plant Ecology Studies #Lichen and fungal ecology
paper · doi:10.1080/00173134.2012.700727
openalex publication_date 2012/07/30 · crossref created 2012/07/30 · crossref issued 2012/12/01 · crossref published 2012/12/01 · crossref published-print 2012/12/01 · crossref deposited 2024/04/27 · openalex created_date 2025/10/10 · crossref indexed 2026/07/27 · openalex updated_date 2026/07/29
Birch (Betula) pollen seasons were examined in relation to meteorological conditions in Poznań (1996–2010). Birch pollen grains were collected using a volumetric spore trap. An alternate biennial cycle of birch pollen season intensity was noticed in Poznań. The main factors influencing birch pollen season intensity were average daily minimum temperatures during the second fortnight of May and the month of June one year before pollination as well as the intensity of the pollen season of the previous year. Most of the pollen grains are recorded during the first week of the season; the number of pollen grains recorded at this time is positively correlated with mean maximum temperature and negatively correlated with daily rainfall. The significant effect of rainfall in reducing the season pollen index was noticed only during weak pollen seasons (season pollen index < mean). In addition, mean daily maximum temperature during the first two weeks of the birch pollen season markedly influences its duration. No significant trends in duration and intensity of the pollen season were recorded, however, a slight tendency towards early pollination was observed (−0.4 days/year, p = 0.310).