Wood is a material characterized by anisotropy of structure and variability of properties in the tree trunk. The indicators of wood properties can be predicted by the density value. Wood density formation in a tree trunk is influenced by many factors. The most important are: age changes, the position in the trunk and the impact of the environment. The purpose of this study is to establish the regularity of wood density formation along the trunk radius. Regularity is based on growing conditions and latitude zoning for Scots pine (Pinus sylvestris L.) and altitude zoning for European chestnut (Castanea sativa Mill.). The studies have been performed on cores including wood sections from bark to core obtained using coring instrument. Density of each annual layer by measuring buoyancy force of specimens immersed in a liquid was determined. The formation features and periods of the maximum density of pine and chestnut wood along the trunk radius were established based on latitudinal and altitudinal zoning of wood in the temperate continental climate of the European part of Russia.

木材是一种以树干结构各向异性和特性可变性为特征的材料。木材性能的指标可以通过密度值来预测。树干中的木材密度形成受许多因素的影响。最重要的是：年龄的变化，在树干的位置和环境的影响。本研究的目的是建立沿树干半径的木材密度形成规律。规律性基于苏格兰松 ( Pinus sylvestris L.) 的生长条件和纬度分区以及欧洲板栗 ( Castanea sativa的高度分区磨。）。已经对使用取芯仪器获得的芯材进行了研究，包括从树皮到芯材的木材切片。通过测量浸入液体中的试样的浮力来确定每一年层的密度。根据俄罗斯欧洲部分温带大陆性气候的木材纬向和高度分区，确定了沿树干半径松木和栗木最大密度的形成特征和时期。