Temporal and spatial variability in allergy-triggering phenological phases of hazel and alder in Czechia
Abstract
Pollen grains of alder (Alnus glutinosa), hazel (Corylus avellana) and birch (Betula verrucosa) belong to the most important allergens not only in the Czech Republic but also in the whole Europe.The data on temporal and spatial variability in phenophases selected with respect to their allergenic effect (flower buttons visible, beginning and end of flowering) and compiled with using statistical and GIS methods during the period 1992–2007 were compared with the current year’s outcomes of the Czech Hydrometeorological Institute phenological network.The results of average entrance of phenophase from this case study: flower buttons visible (Hazel – February 3 to February 22, Alder – February 7 to February 26), beginning of flowering 10% (Hazel – February 19 to March 20, Alder – February 22 to April 2 ), end of flowering (Hazel – March9 to April 17, Alder – March 15 to May 13).