| Abstrakt: |
Object of study are plantations from half-sibs progenies of three black locust clones (Roszin Varga, Tsarevets u Karaisen) on the territory of SFE Svishtov, section 34-k, with area 67 dka. Comparative analysis was made of the thickness structure of half-sibs progenies of three 7- and 11-year-old black locust clones on the territory of SFE Svishtov. The inventory indices (average height and average diameter) at both ages vary in small range and the diameter growth for 4 years is from 25.3% to 42.9%, and of the height - from 16.7% to 28.4%. The basal area per 1 ha has increased from 57.1% to 94.9%. The test of Shapiro-Wilk proved the hypothesis for normality of the distribution in diameter for both ages, and through the Kolmogorov-Smirnov criterion the black locust clone was established, for which it is mostly valid. The coefficients of asymmetry and excess showed that the distributions in diameter are predominantly moved to the left of the mode, i.e., to the thinner trees. In two of the cases in one of the investigated sample plots it is observed insignificant shift of the distributions to the right from the average diameter. These peculiarities were also confirmed during the study on thickness growth through variation curves of distribution, and significant deviations from the course of the Tyurin's unified variation curve of distribution were exemplified in all case studies. [ABSTRACT FROM AUTHOR] |
