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Research of windbreaks in a chosen cadastral area from the point of view of woody plants species´ representation and their health condition
Knoblochová, Martina ; Janeček, Miloslav (advisor) ; David, David (referee)
This thesis evaluates the current state of selected wind breaking types, looking at their species composition, condition and functionality.
One of the most efficient precaution against wind erosion are wind breaking swathes of woodland, windbreakers. These woodlands protect adjoining land against wind erosion of topsoil, blowing away snow cover as well as lowering water evaporation. The right position in the landscape, species composition and a good state are important for windbreakers to fulfil the above mentioned function. In the Czech Republic, 29% of farmland is badly affected by wind erosion. The most affected areas are situated in the South Moravian region. For the purpose of this dissertation work, two areas were chosen. Both of them are situated in the district of Znojmo, where the highest level of wind erosion is found. Area 1 lies in the districts of Břežany, Čejkovice and Božice. Area 2 lies in the districts of Velký Karlov, Hrádek and Křídlůvky. In order to investigate suitability of current windbreakers, the state of potential natural vegetation, climate, geological, paedological and hydrological conditions will be investigated in both of these areas.
For the assessment of the effect of windbreakers, methodology after Podhrázská (2008) was used. This methodology allows assessment of these trees as individual linear elements, but also as a part of a network of these elements. The assessed criteria will be, for example: position in the landscape, species composition, age, functional type, height, width and the number of rows. Furthermore, horizontal and vertical parameters will also be investigated. For the evaluation of the functionality of the network of elements, it is also crucial to look at the tree orientation, their position in relation to the terrain and the direction of the wind. Moreover, the distance between individual woodlands also plays a significant role. The effect of windbreakers on the landscape will be further assessed using classification system after Kolařík (2005).
Over the course of this project, 22 windbreakers were selected for evaluating their functionality and a proposal for their re-establishment in the future was suggested.
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