Cambial Activity of the Sessile Oak (Quercus petraea) in Belgrade Forest, İstanbul

Authors: ÜNAL AKKEMİK, HATİCE ÇINAR YILMAZ, ORHAN SEVGİ

Abstract: The cambium activity of Quercus petraea (Mattuscha) Liebl. (sessile oak) in Atatürk Arboretum (Belgrade Forest, İstanbul) was studied by mounting 5 manual and 5 electronic dendrometers on 5 dominant trees very near to each other (2-5 m). Cambium activity began during the first week of May in 2003, and 1 month earlier, the first week of April, in 2004. The fast growing season for both years was May to July, accounting for 90% of diameter increase. Earlywood/latewood ratios measured on tree rings varied principally with changes in latewood widths, as affected by climate. The highest and most significant correlations were between soil moisture at different depths and 10-day lagged growth forward, 0.78-0.96 in 2003, and 0.22-0.79 in 2004. We found only slight summer dormancy in this humid region, restricted to dry and hot summer days.

Keywords: Quercus petraea, sessile oak, cambium activity, dendrometer, Belgrade Forest, Atatürk Arboretum

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