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Stav a potenciál přirozené obnovy po kalamitě na revíru Polana, LS Jablunkov
Dyrčík, Vojtěch
The aim of the presented thesis was to evaluate the status and potential of natural regeneration in relation to the condition of surviving individuals of the parent stand after a bark beetle calamity. The locality of interest was the Polana forest district, located in the territory of the Jablunkov forest administration. Five representative stands were selected for the field survey, where after the death of the spruce stand component, there remained in the upper stage individuals of the parent stand, mostly beech (Fagus sylvatica L.). As the number of beech (Fagus sylvatica L.) individuals in the parent stand increased, so did the frequency of rejuvenation of this tree species. In places where there was less beech (Fagus sylvatica L.), spruce (Picea abies (L.) Karst) and white birch (Betula pendula Roth) became more prominent. The most abundant species in the parent stand were beech (Fagus sylvatica L.), sycamore (Acer pseudoplatanus L.) and larch (Larix decidua Mill). A relationship between the rejuvenation of beech (Fagus sylvatica L.) and the condition of the parent stand was also found in the area where the regeneration inventory was repeated. Here, the natural regeneration of Norway spruce (Picea abies (L.) Karst) was more pronounced,as well. In contrast to beech (Fagus sylvatica L.), its abundance in the regeneration decreased after two years.The areas of interest can be considered as restored to 94 % of the total area, of which 77 % was created by natural regeneration alone and 17 % by combined regeneration. In 6 % of the area, rejuvenation gaps need to be filled.
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Průběh kalamity a stav obnovy na revíru Polana, LS Jablunkov
Dyrčík, Vojtěch
This bachelor´s thesis deals with the calamity and subsequent restoration on the clearings of the district Polana LS Jablunkov, Lesy České republiky s.p. According to the forest management records, the course of the calamity and renewal in the years 2009–2020 was determined. The beginning of the calamity can be considered the year 2016, when the volume of harvested wood increased by twice the volume of the previous year and was still increasing. As the area of the clearings increased, the extent of renewal also increased. The most frequently used tree species for artificial regeneration was a beech (Fagus sylvatica L.). The beech was also the most widely used in natural rejuvenation. The state of natural regeneration was determined on three selected clearings. Selected clearings are located in the 4th, 5th and 6th forest vegetation stage. The following parameters were determined and evaluated on the network of inventory areas: height, type of plants, abundance and game nibble damage. The results show that the clearing in the 6th forest vegetation stage has a lower frequency of natural regeneration. The most represented tree species in natural regeneration was Norway spruce (Picea abies (L.) Karst.).
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