Cambial activity of the sessile oak (Quercus petraea) in belgrade forest, Istanbul

The cambium activity of Quercus petraea (Mattuschka) Liebl (sessile oak) in Atatürk Arboretum (Belgrade Forest, Istanbul) 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.