 ISSN 0235-7224 ISSN 2029-0586 (online) |
2007 m. Nr. 1 Influence of the thermal mode on seasonal
phenological phenomena in Lithuania
Data of a phenological research performed in 1961–2000 in Lithuania are summarized. Average many-year dates of the beginning of flowering of European hazel (Corylus avellana L.), European bird cherry (Padus avium Mill.), sweet mockorange (Philadelphus coronarius L.), small-leaved linden (Tilia cordata Mill.) and the colouring of Norway maple (Acer platanoides L.) leaves were determined. Alterations in the dates of phenophase occurrence of European hazel and sweet mockorange in relation to climate warming were evaluated. The research has shown that because of temperature impact and its larger fluctuations early in spring, the dates of the beginning of flowering for European hazel (Corylus avellana L.) are characterized by higher mean square deviation values (S = 16 days) than of other indicator plants such as European bird cherry, sweet mockorange, small-leaved linden (S = 6–9 days). The thermal regime of February (r = –0.76 – (–0.84)) and March (r = –0.63 – (–0.79)) has a stronger impact upon annual fluctuations of the dates of the beginning of flowering of European hazel. The beginning of flowering of the summer indicator sweet mockorange depends upon the thermal regime of April (r = –0.56 – (–0.66)) and May (r = –0.38 – (–0.56)). Keywords: phenological periods, plants-indicators, climate, air temperature mode |
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