DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 1-2/2018 str. 40 <-- 40 --> PDF |
the degree of slenderness amounted to 97. The trees were characterized by a relatively small variation in diameter (kv%=24.1), and their distribution per diameter degrees was characterized by weak skewness (α3=-0.092) and mild platykurtic kurtosis (α4 = 2.445). Height curves of the investigated culture at the ages of 32, 40 and 50 are shown in Graph 4. The assessment of the height curve model, expressed through the coefficient of determination (R2) and the standard error of regression (se), shows a satisfactory agreement between the empirically measured heights and the obtained models (Table 3). At the age of 40, we can notice a more intense shift of height curves towards greater heights compared to the age of 32. At the age of 50, they shifted to the right, towards greater diameters compared to the age of 40. In the period between the ages of 33 and 40, the mean stand height (hL) of the aspirant collective increased by 5.4 m (from 15.1 m to 20.5 m) and in the period between the 41st and 50th year of age by 4.9 m (from 20.5 m to 25.4 m) . The growth of individual trees – Rast pojedinačnih stabala The height growth determined by the detailed analysis of dominant trees (D100 and D400) before the age of 40 and the model of height growth before the age of 50 are depicted in Graph 5. The model of the height growth of dominant trees before the age of 50 shows satisfactory agreement with the empirical sizes obtained on the basis of the detailed analysis in the period before the age of 40 and the measurement of growth elements conducted at the age of 50 (Table 4). The height growth of the studied dominant trees was characterized by a gradual rise before the age of 10 and the current height increment culmination at the age of 17 at a height of about 6 m. After the culmination, the current height increment retained high annual values to the observed age of 40. The height growth model points to the culmination of the current height increment at the age of 25, at a height of 11 m (Graph 6 left). The current diameter increment of dominant trees, obtained from the detailed tree analysis, had a culmination at the age of 15. It retained high values to the age of 21, which was then followed by a significant decline, so that at the age of 31 it had the smallest values (Graph 6 right). The average value of the diameter increment of dominant trees in the period between the ages of 25 and 32 amounted to 4.9 mm∙year-1 in the representative of the 100 thickest trees and |