The introduction of the thesis consists of a review of literature about thermal modification of wood. More precisely, the author presents history, possible ways of treatments and the impacts on the treated material from the point of view of chemical, physical and mechanical changes. The introduction of the thesis describes the main subject of the research European Beech (Fagus sylvatica L.). The practical part of the work focuses on a contact high-temperature treatment of the samples. It is intended to achieve in the cross-section uneven modification. The treated samples were chemically analyzed. Finally, the results are evaluated and discussed.

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The aim of this diploma thesis is to evaluate the growth of cultures and stands estabilished using bare-rooted and ball-rooted planting stock on working-plan area, forest district Jablunkov. For this purpose a total of 23 stands were selected (evaluated) on 46 research plots on forest district Jablunkov. In addition, the two economically most important tree species were selected for research; Norway spruce (Picea abies L.Karst) and European beech (Fagus sylvatica L.). These areas were selected on the basis of geographic and typological differences of habitat. A minimum of 60 viable individuals from bare-rooted and ball-roted group were measured on each plot and also the root deformations of the selected tree species were measured. The following parameters were measured for each individual: the height of the above-ground parts, the last accretion, the thickness of the root collar, the number of branches, the length of the branches, the size of the assimilation apparatus. The following features have also been observed and evaluated: loss, vitality, damage, trunk shape, crown shape, and root system deformations. From the results it was found out that out of 23 stands, ball-rooted planting stock was evaluated as better in 16 cases, in 5 cases was better bare-rooted planting stock and in 2 cases no better variant was found. In assessing of the root system, it was found that up to 100 % of the root system deformation was found in both types of planting stock.

Present study analyses the impact of Cross – section uneven thermal modification of wood caused by hot press at 200 °C. The beech wood was examined at radial and tangential direction. The resulting samples were chemically analysed by spectrophotometry to determine the penetration depth of the thermal modification. Also, was examined dimensional stability during soaking at water for 15 days. In the first part is a review of literature on the description of the heat treatment and common using methods in practice. Further, the material properties of the beech wood and the possibilities of using this material were examined. Measured data were statistically analysed, the results were discussed and compared with the literature.