The temporal and Spatial Variability of the Phenological Phases Connected with Pollen Season of the Main
Abstract
Nature and its exploration is one of the most frequent objects of scientific research. Phenology can described either as the study of natural events, or of biological events, in relation to climate.
The Czech Hydrometeorological Institute operates phenological network (45 wild plants') with allergology important species within the observation program (the program includes among other species also the Common Hazel (Corylus avellana L.), the Common Alder (Alnus glutinosa (L.) Gaert.), the Silver Birch (Betula pendula Roth.), the Meadow Foxtail (Alopecurus pratensis L.) and the Cocks Foot (Dactylis glomerata L.). We have statistically evaluated the phenological stages closely connected with the pollen grains release into the air (the beginning of flowering - BBCH 61 and the end of flowering - BBCH 69) including maps creation.
The processed period was within last twenty years 1991 - 2010. The maps were processed using geographic information systems (Application Clidata-GIS, method Clidata - DEM).
As the input data were used the mean dates of phenophase entrance from the twenty year period 1991 - 2010