Acta Scientiarum Polonorum
Silvarum Colendarum Ratio et Industria Lignaria

Abstract In the course of the performed investigations, 4 indices of the volume increment were subjected to basic analysis concerning the main statistical characteristics. The empirical material comprised 94 pine trees derived from an 86-year old pine stand. A complete bole analysis was carried out on cut trees and then, in consecutive 5-year increment periods, 4 indices of the volume increment: C1, C2, C3, C4 and volume increment intensity as i’. Set against the variability of the volume increment intensity i’, the variability coefficients in the consecutive 5-year increment periods of the volume increment index C1 were bigger, C3 and C4 – comparable and C2 – smaller than the variability coefficients i’. There was no correlation between the mean of two volume increment indices (C2 and C3) and the age of trees. The mean of the C1 index increased with the age of trees. The C4 mean declined with the increase of tree age. The population of the volume increment intensity i’ in each increment period was characterised by the distribution which did not differ from the normal distribution. The C3 index distribution differs for the normal distribution for 1 increment period, of the C4 – for 2, C2 – for 6 and of the C1 – for 12 out of the 15 analysed periods.