Abstract
The degree of space occupancy with woody plants has a certain limit associated with their biological characteristics and the level of soil fertility. The value of relative density in our country serves as a criterion for determining the intensity of thinning, while abroad the “index of forest density is used”. The purpose of the study is to substantiate the limit line “average diameter – average distance between trees” in stands of the main forest-forming species according to the data of long-term observations on permanent sample plots. The materials for the study were measurement data on permanent sample plots in the Forest experimental station of the Russian State Agrarian University – Moscow Timiryazev Agricultural Academy. Sample plots were selected where the sums of the cross-sectional areas reached the maximum values once during the life of the stand, as well as where the sums of the cross-sectional areas reached the maximum twice. To verify the validity of the regression line passing through the origin, a program for calculating the equation of a straight line with a free term was used. The hypothesis of direct proportionality of the average diameter of forest stands to the average distance between trees is confirmed, while the dependence of the proportionality coefficient on the initial number of trees is not observed. In stands with maximum sums of cross-sectional areas, the ratio of the maximum average diameter to the average distance between trees is close to the constant. It serves as a good indicator of the degree of space occupancy and can be used in production and technical calculations.
Published Version
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