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The aim of the thesis was to evaluate the formation of preparing birch stand and the growth of silver birch underplanting. The measurements were realized in 2015 – 2018 in TVP Skrchov. The area was divided into 4 variants; no heavy thinning, intensity heavy thinning 50 %, 30 % and silver fir gap. In the birch stand there was evaluated breast-height diameter and its growth, basal area and by Shädelin tree classification the target trees were chosen. The silver fir underplanting was measured for mortality, root colar diameter, height, diameter growth, height increment, health condition, and the size of crown projection. The best value had the birch stand with thinning intensity of 50 %. In this stand there was reaction of release after heavy thinning. On the other hand the lowest value of production had the birch area without heavy thinning. Nevertheless, the value of slenderness ratio was high (110 – 120) and the share of green crown was low (33 – 35 %) for all variants. It shows worse vitality and stability of the birch stand and it indicates the late heavy thinning. The silver fir grew best in the gap where it had the highest diameter growth, height increment, healty condition and lowest mortality. The best of underplantings was the silver fir grown under the birch stand without heavy thinning. The worst results had the silver fir with 50 % of heavy thinning intesity. |
