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ŠUMARSKI LIST 3-4/2019 str. 72     <-- 72 -->        PDF

The positions of height curves constructed for the stand ages of 75, 80 and 85 years are pointing to the usual dynamics of height curves moving with age in regular stands. The small value of height increment and the superiority of diameter growth compared to height growth in thinner trees caused the small moving of height curves towards greater heights compared to the age of 75 years (Graph 2).
The elements of estimation of the height curve smoothing show a good fit compared to measured values with the coefficient of determination 0.76-0.79 (Table 4).
The growth elements and the current increment of growth elements of trees in different growing conditions in the stand – Elementi rasta i tečajni prirast elemenata rasta stabala u različitim uvjetima za rast u sastojini.
The average value of available growing space at the age of 75 years, defined by ‘’Voronoi’’ polygons, in collective of inner trees (A) is 14.6 m2·tree-1 and is significantly smaller than in the collective of edge trees (B) where it is 21.84 m2·tree-1 (p < 0.0001).
During the spontaneous development of the stand, the collective A was characterized by the reduction of the number of trees (mortality and windthrows) compared to the age of 75 years. Compared to the collective B, collective A had higher the number of trees by 19-33%, but lower the mean diameter by 24-29%, the dominant diameter by 10-16%, the mean height by 7-10% and the dominant height by 1-2% in the observed stand ages. These ratios in the values of diameter and height of mean and dominant trees in different collectives of trees are pointing out the differences between them, that are expressed in the value of the slenderness index as well. In the collective A, the slenderness index of the mean trees is 16-21% higher compared to the collective B. The dominant trees in the collective A have 7-13% higher slenderness index compared to the collective B.