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Dry grassland restoration on a limestone quarry landfill using different sowing densities
Strušková, Eliška ; Kuťáková, Eliška (advisor) ; Mudrák, Ondřej (referee)
Grassland restoration by sowing seeds of native species is one of the most commonly used methods of community restoration, especially in cases when conditions are not favourable for spontaneous succession, for example due to absence of a suitable seed source in the vicinity or introduction of unsuitable substrate. Although seeding is commonly used, there is still no consensus on what seeding densities are sufficient to restore the target community. The aim of this thesis is to assess the influence of seeding density on species composition of the restored xerotherm grassland on two different substrates in a limestone quarry in the Czech Karst during eight years from the beginning of the restoration. It also assesses the influence of the subsequent management of the site, specifically grazing. The results of this thesis show that the sowing density influences plant community composition and vegetation cover only in the first five to six years of the community development and only on the quarry substrate. On the ex-arable soil seeding density does not significantly affect the community composition. Plant community on this substrate is dominated by ruderal species. Grazing promotes vegetation development towards a community of dry grassland and suppresses non-target ruderal species. These findings can...
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Grassland restoration in abandoned quarries by sowing seed mixtures
Strušková, Eliška ; Kuťáková, Eliška (advisor) ; Knappová, Jana (referee)
There are many former or still active quarries in the Czech Republic that had disrupted the natural landscape. Under certain conditions, species-rich herbaceous communities can develop in abandoned quarries and these can also serve as a refuge for species that slowly disappear from our landscape due to human activity. In order to create suitable conditions for establishing valuable habitats, it is necessary to choose thoroughly the method of recultivation. Since abandoned quarries are frequently isolated from natural seed resources, sowing of regional mixtures is one of possibilities of recultivation. This bachelor thesis deals with all the steps of this method of recultivation, from the importance of seed origin and their composition in a mixture, through the method of seed collection, methods of sowing, to the combination of seed sowing with the other approaches supporting recultivaton. Keywords: recultivation, abandonded quarries, ecological restoration, seed sowing, semi-natural vegetation
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