By choosing a crop tree in the forest, forestry experts influence the composition and shape of the forest in the future and thus try to realize silvicultural goals and guidelines. In order to make a successful choice, it is necessary to acquire forestry knowledge, at the same time experience and subjective judgment also have a great influence. The purpose of the diploma thesis is to investigate on the basis of which tree characteristics the experts decide to choose the crop tree and the competitor, to determine the structure of the crop trees and the competitors with the best and worst match in the referent, and to evaluate the role of the reference plot for training (marteloscope) of forestry experts. For the research, we set up two 30 × 30m reference plots in the Haloze area, where we measured and marked the trees. On the plots, forestry experts carried out 16 tree markings according to the principles of traditional (selection thinning) and situational forest tending. The results suggest a better overall match of tree markings within in traditional tending, that competitors were are more vital in situational tending, and that crop trees were are more vital in traditional tending. Tree species and vitality had a significant effect on the consistency of the selection. In general, the tree markings differed more than expected, which is partly the result of the dominant beech stand with similar structure and partly the result of the introduction of new situational tending concept, which also influenced the greater diversity of the tree marking with traditional tending.
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