GEOGRAPHICAL VARIABILITY OF THE LENGTH OF THE TRACHEIDS OF THE SCOTS PINE UNDER CONDITIONS OF BELARUS

The article presents the results of an experimental study of the variability of the length of the tracheids of the Scots pine from the southern and northern regions of Belarus (using the example of mossy pine forests). The ambiguity of variability in the length of early and late tracheids was established by the years of monitoring (2015–2019), regardless of the place of growth (for 28 % of the considered variants, there are no statistically significant differences by year). It was found that the tracheids in the late part of the annual layers in the southern and northern regions are longer than in the early part on average by 2 % and 6 %, respectively. The influence of geographical origin on the size of tracheids has been reliably proven: in the southern regions, early and late tracheids are on average 1.2 times longer than in the northern regions. The data obtained indicate that the length of the tracheids can serve as an identifier of the place of growth.