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Hodnocení stavu obnovy na kalamitní holině v oblasti východních Čech
Pišlová, Tereza
The thesis is focused on the evaluation of natural regeneration in a calamity clearcut in the eastern Bohemia. The area of about 5 hectares arose as a result of a wind disaster in 2005. The initial forest cover consisted of full - grown trees mainly represented by spruce. Nowodays, the stand composition is dominated by softwood deciduous trees, a type of pioneer species, mainly represented by the birch. The main research was carried out in years 2015 - 2016. For this purpose, a lasting research area of 125 m2 was created. It was divided into 20 separate parts. Another research was undertaken in tree circle areas of 100 m2. This thesis also includes evaluation of artificial regeneration of spruce. Natural regeneration was 8080 pcs/ha. The share of birch in the area is 70 % and it shows a great extent of recovery process and further growth. Birch is the essential component of the upper stand. The spruce, as a target tree species, represented only 24 % share in the area, with the occurrence only in sub-level stands and with rather irregular psacing. However, spruce is the only tree species which showed some slight increase in growth.
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Vliv intenzity výchovného zásahu na formování březového porostu a růst podsadby jedle bělokoré
Pišlová, Tereza
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.
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