With regards to growths a high variability of trunk distribution is observed due mainly to the factors which act on the cambial tissue. The factors which decisive influence formation of annual rings are: stational and climatic factors, phytocenotic position of the tree, development possibilities of the crown and last but not least the applied sylvotechnical measures. The variability of height growths is mainly due to trees competition towards light precisely the high frequency of trees with superior growths in heights. This way a height growths distribution appears with an asymmetry on the right side which becomes more present as the light competition grows. The variation coefficients of height growths have inferior values to the ones of diameter growths, a fact which can be explained because of the correlative connections between diameter and height growth. Volume growth variability is higher than radial and height growth variability. Growths in volume, if the whole stand is taken into account, are mainly determined by trees with a diameter above the medium value, which are well established in the stand and their coenotic positions allow them to accumulate the most. The work presents interesting information about the conversion of the increment cores extracted with Pressler`s borer and obtaining the size of the annual rings. The research purpose is subordinated to a larger theme which pursued biometrical and auxological determinations in order to establish growth and productivity of mixed sessile oak and European beech stands from the middle basin of Crisul Repede river. Concerning the research stages, there are medium results at national level regarding growths and productivity of the stands comprised in production charts elaborated for pure and even-aged stands, values which most of the times do not correspond to field facts, these having a purely orientative character. The counting which takes place in tested areas of 2500 sqrt was used as a method and the studied stands and computer software’s used for the conversion of data were used as material of study. The work has innovative character because it shows new results concerning wood quantity accumulations and also the variations of these volumes in ratio with exhibitions and species proportions from the mixture of trees, which can be successfully used by the forest department for the increasing of stand productivity.

increment, stands, productivity, sessile oak, European beech

Presentation: oral