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The effectt of shrubs on establishment of woody plant species in grazed landscape
Wiesner, Pavel ; Vojta, Jaroslav (advisor) ; Brůna, Josef (referee)
My bachelor thesis is concerned about mechanisms that influence establishment and growth of woody plant species under grazing pressure in the temperate climate region. Based on literature sources it determines and explains individual mechanisms and attempts to merge them into a holistic view of the issues of reproduction, propagation and survival of trees and shrubs in the grazed landscape. In general, grazing affects the course of natural succession and under certain conditions helps to maintain shifting landscape mosaics. In addition, the effects of grazing are retroactively modified by the already existing vegetation mosaics. In this regard, existence of shrubs providing protection to seedlings and saplings against bad environmental conditions and against grazing pressure is important, as they help to change spatial heterogenity of vegetation and to establish the shifting mosaics mentioned above. As the spatial heterogenity and total diversity of vegetation can increase or decrease under influences of many factors, the bachelor thesis also pursues the importance of spatial distribution and intensity of grazing, different commonly grazed species and usual systems of grazing management. Keywords: grazing, associational resistance, cyclic succession, wood-pastures, spatial heterogenity of...
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Comparison of small mechanization for an adjustment of the shrubbery.
JANURA, Lukáš
The aim of this thesis is comparing several species of devices´ small-mechanization for an adjustment of the shrubbery. The work contains familiarization with the history of this issue and these machines and safety precautions for a manipulation. Service of brush cutters will also be broken down and comparing of three selected species according to their characteristics such as a fuel consumption, a performance, a weight and the function of antivibration elements are subjectively compared. The machines will be given their description. The conclusion of the work should serve as an aid for selecting brushcutter and ease the choice of selecting.
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