Laboratory of Dendrochronology

Dendroclimatology of pedunculate oak

        Investigations on pedunculate oak have started in Lithuania quite early. A network of 43 experimental plots 2584 samples) on oak was set in 1970-1975. Tree-ring widths were measured under „MBS-2” within 0.05 mm accuracy. 43 local chronologies (indices only) were published in the 1st volume of chronologies in 1979. The oldest tree spans 259 years from 1715 to 1974 (Битвинскас, Кайрайтис, 1975).
        Research has shown that the most noticeable growth suppressions occurred in 1730-1770 and for some experimental plots also in 1830-1860. 33 years with radial growth decrease common for the majority of chronologies were observed in 1800-1971. During the 20th c. the growth decreased in 1928, 1937-1941, 1952-1955, and 1964-1965. The increase of the radial growth was found during 27 years in 1730-1770 period (Битвинскас, Кайрайтис, 1974).


The local chronology of oak (indices) in Giria forestry (Rokiškis enterprise)

       The relationships between the radial growth of oak and climatic variables were counted for an experimental plot in the Kaunas district. The highest similarity expressed by the coefficient of similarity was found between precipitation in June (71.5%) and temperature in May-July (68%) (Битвинскас, Кайрайтис, 1975).
        The highest correlations across the Lithuania were received with temperature in February, April, and May. However, the links with precipitation are lower and more variable (Кайрайтис, 1978). The multiple regression or response function analysis were not performed.

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