Stacked-timber ratio and stem volume of horse chestnut trees within Kyiv City urban stands
DOI:
https://doi.org/10.31548/forest2020.02.032Abstract
Urban forest are influenced by urban environment, what has a negative effect on the vital activities of the trees. Growth environment of trees on urban territories and in natural areas are completely different. Research data was collected in urban forest stands of Kyiv city during thinnings. Special methodological characteristics of the measuring of main biometrical tree parameters in urban area are explained in this work. Importantly, chestnut trees have morphological feature which stems are branching on the certain height leading to occurrence of the several main branches.
Modelling tree stem volume, the most important pattern to find was a mathematical dependence of form factors on the main tree biometrical parameters. Basic descriptive statistics of chestnut trees parameters were estimated. It is defined that the percentage of trunk volume decreases with an increase of tree diameter and in trees over 60 cm can make up to 30% of the total tree volume. Carrying out a correlation analysis of model trees, it was examined that form factors of tree stems were highly linked to the branching height. Based on the statistical analysis it was estimated that developed mathematical model reflected empirical data adequately and could be validated according to the current forest mensuration accuracy requirements properly. Moreover, a bias of the developed form factor model examined using Student t-criteria is not significant.
Respective information-support tables to estimate stem volume of chestnut trees were created based on the developed form factor model, harnessing the classical formula of forest mensuration. Given stem volume tables created considering physiological features of chestnut trees under urban environment conditions can be utilized by the organizations which manage forest stands and parks within settlements.
Keywords: diameter, height, the volume of the stem, mathematical model, form factor.
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