Наукові праці Лісівничої академії наук України (Mar 2019)
Standards for estimating the crown productivity of pine stands within the conditions of the Northern Steppe of Ukraine
Abstract
The biological productivity of forests is considered as their main characteristic, which determines the course of processes in forest ecosystems. It is used for ecologi-cal monitoring with the constant management of forestry. Scots pine is the most widespread forest species, both on a scale of Europe and Ukraine. With this in view, provision of information on the modeling of bioproductivity of pine plantations in the conditions of the steppe zone of Ukraine is a very topical issue. The object of the study were the Scots pine stands, which grow in the condi-tions of the Northern Steppe of Ukraine. The subject of the research was the bi-oproductivity of the crown components of the Scots pine stands within Northern Steppe of Ukraine. The aim of the research was to develop models and normative ta-bles of structural components of crown biomass of the Scots pine stands within Northern Steppe of Ukraine. Scots pine stands within forest fund area subordinated to the State Agency of Forest Resources in Dnipropetrovsk region were evaluated. During preparatory field mensuration, and laboratory research stages methodology developed by P.I. Lakyda used. On the basis of the research results the working mass of data of biometric pa-rameters with inclusion of average diameter, average height, relative density, foliage biomass in fresh state, branches biomass and needles biomass in absolutely dry con-dition for Scots pine stands are formed. The statistical analysis showed, that skewness and kurtosis were higher than their critical values in case of distribution foliage biomass, branches biomass and needles biomass of stands. It was found that curves of distribution of biomass of all crown components are characterized by sharpness and left-hand asymmetry. The data analysis on correlation coefficients showed a straight moderate corre-lation of branches biomass with the mean diameter of stands (r = 0.45), and a signifi-cant correlation all components of crown biomass with relative density of stands (from 0.69 to 0.74). During the modelling, the arguments for regression dependencies were the av-erage diameter, average height and relative density of stands. The developed mathe-matical models demonstrated the presence of a direct link between the biomass of any crown component with a mean diameter and the relative density of stands. In the case of mean height of stands, this connection was inverse. The normative tables are given, the main purpose of which is to use them to es-timate the biomass of crown components of Scots pine stands with relative density in the range from 0.6 to 0.9. It has been established that foliage biomass, branches bio-mass and needles biomass in pine stands increase with the growth of average diameter of stands, while with increasing average heights it goes down. The analysis of Scots pine crown biomass for structural parts revealed a gradu-al decrease in needles biomass with corresponding increase of branches biomass part with increase stands age. The comparative analysis of the study results with the data found by the authors for the pine stands another natural zones of Ukraine is presented.
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