Abstract
Phenology season are contrary of meteorological season delimitated according typical phenophase onset of some species. Phenology season are divided into 7 season: phenology early spring, forward spring, full spring, early summer, full summer, early autumn and full autumn which means the end of vegetation season.
Phenology season onset are defined subsequently (Ihne, Drude): early spring - beginning of flowering Corylus avellana L., Alnus glutinosa (L.) Gaert. and Galanthus nivalis L.; early spring - beginning of flowering of Cerasus avium (L.) Moench, Betula pendula Roth. and Acer platanoides L.; full spring - fully leaved Betula pendula Roth., Acer platanoides L. and Cerasus avium (L.) Moench.; early summer - beginning of flowering of Tilia cordata Mill., Sambucus nigra L. and Dactylis glomerata L.; full summer - fully ripe of Sambucus nigra L. and Sorbus aucuparia L.; early autumn - leaves colouring of Betula pendula L., Sorbus aucuparia L. and Tilia cordata Mill; end of autumn - leaves fall of Sambucus nigra L., Sorbus aucuparia L. and TILIA cordata Mill. The season onset are calculated within 1991 - 2010 from all phenological stations in the Czech republic.
Results were also compared with other phenology season onset criterions and we have calculated correlations between synoptic situation and phenology season onset. Phenology seasons onset were also executed by GIS methods (Clidata-DEM) into maps.