Товарна структура вільхових деревостанів Лівобережного Лісостепу України

Abstract

Наведено результати досліджень товарної структури вільхових деревостанів Лівобережного Лісостепу України. Установлено залежність відсотку ділових стовбурів на ділянках від віку та продуктивності. Розраховано вихід окремих категорій деревини у модальних порослевих вільхових деревостанів залежно від середнього діаметра. Проведено порівняння отриманих результатів з результатами інших авторів

Приведены результаты исследований товарной структуры ольховых древостоев Левобережной Лесостепи Украины. Установлена зависимость процента деловых стволов на участках от возраста и производительности. Рассчитан выход отдельных категорий древесины в модальных порослевых ольховых древостоях в зависимости от среднего диаметра. Проведено сравнение полученных результатов с результатами других авторов.

The results of the studies of commodity structure of alder stands of the Left-Bank forest-steppe of Ukraine are presented. The object of the research is black alder stands of the Left- Bank Forest Steppe of Ukraine. The forest database of the company "Ukrgoslesproekt" is used where the main species is the black alder for timber enterprises within the Left-Bank forest-steppe of Ukraine and 10 experimental plots located in different parts of the region under studies. The analysis of marketability of alder stands by age classes shows that the percentage of commercial trunks increases to the age of 70 and then gradually decreases. The analysis of the experimental plots data confirms the pattern established by the results of the processing of the data base.The standards of commodity crops structure are developed in relative terms to the stands of Ia and I value classes. The largest share of commercial wood is found in the stands with an average diameter of 26 – 28 cm which corresponds to the age of 60. The analysis of the dynamics of marketability standards of alder stands was carried out by comparing the average diameter of the stands, the total stock and the stock of commercial timber with those provided in the regulations developed by O. A. Gears for Polissie conditions, M.V. Davydov – for the forest-steppe and Polissie and by V. I. Storozhenko – for the Donetsk steppe. According to the research it is discovered that in the conditions of the Left-bank forest-steppe region of Ukraine commercial timber reserves are significantly less than in Polissie which is associated with the lower stocks of commercial wood and less part of hard wood in the region under the research. These differences are due to the structural features of the alder stands of the Forest-steppe region and larger number of trees damaged by rot at the bottom of the trunk. But they are higher than the corresponding rates in Donetsk Steppe region due to larger average reserves in the region under studies.The results of the studies of commodity structure of alder stands of the Left-bank forest-steppe of Ukraine are presented. The dependence of the percentage of the commercial trunks on the age and productivity is determined. The output of some certain categories of timber in alder stands is calculated depending on the average diameter. The results obtained in the research are compared with the results of other authors