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Pařezová výmladnost jako základ obnovy a produkce nízkého lesa =: Stump sprouting as a basis for the regeneration and production of coppice /
Uherková, Barbora
In 2008, a young coppice was established and studied in the south-eastern part of the Czech Republic. The main studied species Quercus petraea (Matt.) Liebl agg. and Carpinus betulus L. are typical species of Central European coppices. The aim of the dissertation thesis was to study the topic of re-sprouting, the process when the new regeneration of sprouts is created. Re-sprouting occurred after thinning carried out at the turn of the years 2014/2015. The number of live and dead new sprouts was recorded, and their heights were measured. Subsequently, the effects of the stump basal area before and after thinning, the thinning intensity, leaf area index and light conditions (gap fraction, openness, direct, indirect and total site factor) were studied on the newly established generation of sprouts. Another aim of the dissertation thesis was to find out the effect of thinning on the growth of the coppice in the current changing climate conditions. For three growing seasons (2015 –2017) after the thinning, the growth (diameter and height increments) and soil water content were observed. To study the effect of climatic conditions, a throughfall reduction was simulated by using drainage channels. Similar system of drainage channels was used in Spain, France and other countries. To address the topic of soil degradation, the impact of throughfall reduction and thinning on soil CO2 efflux was investigated. Comparison between subplots with and without thinning, subplots with and without throughfall reduction and coppice with false high forest (control area to the research area of coppice forest) were carried out. As far as the re-sprouting is concerned, the stump basal area before thinning and the thinning intensity statistically significantly influenced the number and height of the new sprouts. Among all factors of light condition, only the indirect site factor was statistically significant. Therefore, the thinning affected soil moisture and the amount of light in the coppice. In the first year after the thinning, the diameter increments of sessile oak and European hornbeam were positively influenced by thinning. In the following two growing seasons, thinning did not significantly influence the diameter increment. However, the height increment of both trees during the whole study period has not been positively affected by thinning. On the other hand, thinning significantly affected the soil moisture. During the three-year study period, soil moisture was higher on thinned plots. This finding is in coincidence with research experiments carried out in southern Europe. The second studied factor, which was the throughfall reduction, did not influence neither the diameter increment, nor the height increment and nor the soil moisture in both species for the entire period. Thinning did not affect soil CO2 efflux rates, whereas the throughfall reduction did. Coppice reached almost the same soil CO2 efflux rates as the false high forest. In conclusion, thinning in coppice leads to an increase of available soil water. The water availability will be very actual issue at lower altitudes – here the tree species are sensitive to high air temperatures and drought stress. It should be noted that the younger developmental stages of the forest stands show increased sensitivity to water deficit due to drought. Thanks to sprouting ability, coppicing can therefore be appropriate management in some deciduous stands at lower altitudes under changing climate conditions.
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Tloušťkový přírůst výstavkových dubů ve středním lese
Kollanda, Viktor
The aim of this thesis was to evaluate the diameter increment of sessile oak standards in a coppice-with-standards as related to release degree, site quality and age of the stands. We also tried to asses differences in diameter increment possibly induced by the above mentioned factors. Data processing and all analyses were done in MS Excel software. As a result, grafhical and tabellar presentation of differences between diameter incerements of partucular variants including the response of trees to release degree and combinations of other factor are shown. Statistical tests have shown that the diameter incerement of standards was related to investigated factors. Trees increased theit diameters on plots where release was done, but there were no significant differences between different release variants. Also, effect of age was also significant. On the other hand, there were no significant differences between increments on different edaphic cathegories.
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Vliv přihnojování sazenic na přírůst a vitalitu kultur 3. LVS a jejich porovnání z hlediska předpokladu jejich zajištění
Kulhánek, Martin
The aim of my bachelor work was to examine the influence of inbuilt growth stimulants into Silvamix fertilizers family, to compare the effect of individual sorts of fertilizers from the point of view of securing these crops. Field works took place in LHC Ketkovice on the tracts located in 75 D1a,77B11, 77B1a and 65B1. I investigated the effect of fertilization on norway spruce, European beech, and mountain oak corps in 2 rd and mostly 3rd LVS. Based on dendrometrical characteristics, assimilation apparatus and health condition the Silvamix R and Silvamix R stimulators these fertilizations were assessed as the best ones. The outcomes show clearly that the action of growth stimulants inbuilt into Silvamix fertilizations family is rather gradual and is not too brisk and distinct on testing.
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Analýza stavu stromů využívaných jako lanové centrum v Rožnově pod Radhoštěm ve srovnání s městským parkem
Dočkalová, Martina
There are many factors that have effect on woody species that grow in the urban area. The goal of this thesis was to find out, whether the rope centre installation has effect on the state of trees. Two locations in Rožnov pod Radhoštěm were selected for the evaluation -- first the rope centre and second the city park, which was used as a reference. 80 trees in total of various species were evaluated visually and 40 specimens of Pinus sylvestris L. were taken using Pressler's drill for the tree-ring analysis. Using this method it was tested, whether the tree used in the rope centre is stressed. Visually were evaluated following characteristics: age class, vitality, health state, stability and perspective of specimens. Using the tree-ring analysis and consecutive evaluation, it wasn't confirmed that installation of the rope centre has negative effect on the wood growth, which is the main indicator of health state and signs of stress.
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