Improvement of the selection criteria and further testing of plus trees of Scots pine requires systematic updating of measurement data, their detailed analysis, and constant monitoring of the created sites. A significant task is to create new experimental plots to investigate the hereditary characteristics of trees, especially in the context of forestry adaptation to climate change. A forest inventory assessment of plus trees of hornbeam-oak and pine forests within the Malopolissia district was conducted to establish the relationship between the height-diameter ratio at 1.3 m and the age of trees in different forest types based on the results of their selection. Standard statistical methods were employed to establish reliable results of analytical and comparative conclusions. Two indices were calculated for the analysis: I1 – an indicator of age-related changes in the A/H/DbH ratio, and I2 – an indicator of changes in the H/DbH/A ratio depending on age. These indices were calculated for plus trees, considering their age (A), height (H), and trunk diameter at a height of 1.3 m (DbH). The dependencies of changes in the height and diameter of plus trees with age were studied, the speific features of these dependencies for the two most widespread forest types were determined, two types of indices of these dependencies were analysed, and the conclusions about their statistically reliable suitability for modelling the parameters of plus tree selection within the study area were summarised. The parametric dependencies of the plus trees of the Malopolissia district of pine forests of this region of origin established in the study can be used as additional criteria for selecting trees for productivity with a sufficient level of their biotic stability. The study summarised the possibility of establishing the regions of origin of forest reproductive material based on parametric assessment of stands and plus trees within the Malopolissia district based on their belonging to autochthonous forest stands by origin. The relevance of the study was enhanced by the introduction of approaches to regionalisation of forest reproductive material, which involves determining the boundaries of the regions of origin and the boundaries of the corresponding distribution of forest reproductive material from them. The proposed approach to regionalisation is a prerequisite for obtaining and putting into circulation forest reproductive material based on the implementation of Directive 1999/105/EC of 22 December 1999 on the marketing of forest reproductive material in the regulatory framework of forest seed production and nursery stock
Blystiv et al. (Sat,) studied this question.