Моделювання перебігу росту за середньою висотою модальних деревостанів твердолистяних деревних видів України

Abstract

In Ukrainian Polissia, forestry practices often deviate from reforestation and afforestation projects due to the intensive distribution and rapid growth of some tree species. In addition, there is an intensive process of afforestation of former agricultural lands by stands of Scots pine (Pinus sylvestris L.), silver birch (Betula pendula L.), black alder (Alnus glutinosa L.), and common aspen (Populus tremula L.). Based on the analysis of the current regulatory-reference tools, the absence of growth tables of mixed modal birch stands was determined and the necessity of creating reference materials using a unified system for forest mensuration of softwood deciduous stands was determined. Statistically significant differences in the growth of monocultures and mixed stands, seed and vegetative origin birch stands by major biometric indicators were established. The difference in the growth of mixed birch and pine-birch stands was found. According to the results of mathema tic modelling stands biometrical parameters, tables of the course of growth of modal mixed birch stands of Ukrainian Polissia have been developed. Other representatives of such stands can be Black alder and Common aspen. Mathematic models were tested for compliance with the biological features of the growth of stands. Thus, a system of models of the growth of modal birch stands was developed, which reflects the dynamics of the main biometric indicators, including average height, average diameter, basal area, growing stock volume and total productivity. Compiled yield tables for modal birch stands, reflecting the specific features of the growth of the studied forests, can be the basic regulatory-reference tools for their inventory. In addition, tables of growth modal stands are the basis for the solution of many other organizational, technical, and planned forest management calculations.