SPECIFICUL DISTRIBUŢIEI DESCENDENŢILOR DUPĂ ÎNĂLŢIME ÎN CULTURILE EXPERIMENTALE ALE STEJARULUI PEDUNCULAT (QUERCUS ROBUR)

Petru CUZA Universitatea de Stat din Moldova A

Abstract

THE SPECIFIC DISTRIBUTION OF DESCENDANTS AFTER HEIGHT IN EXPERIMENTAL CROPS OF PEDUNCULATE OAK (QUERCUS ROBUR) 

Was studied the specific distribution of the descendants of common oak (Quercus robur) by category of heights in autumn and spring sowing. It has been demonstrated that at the individual growing stage of the saplings, in the absence of competition between copies, the distribution of oak numbers by height classes, both in autumn and spring crops, is approaching the law of normal distribution. After realizing the massive state of the oak frequency curve in relation to the height, it has a right asymmetry. This demonstrates that in the competition for solar energy and mineral elements in the soil, a part of the genotypes, with superior hereditary attributes, growing fast inside tend to occupy dominant positions, embarrassing the growth of the least developed. In this way natural variability is reduced caused mainly by genetic diversity, as a result of the growing influence increasingly pronounced of environmental factors, especially trophic ones (mineral nutrition and illumination) on growth in oak height. 

Keywords: Quercus robur, crops of descendants, sapling, heights, curves of distribution.