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Possibilities of restoration of endangered wetland biotopes from soil seed bank on example of salt marches
ČÍŽKOVÁ, Eva
Over the past few decades, natural habitats have been massively disrupted and disappeared, resulting in a decline or disappearance of plant species limited to these habitats, thereby the species richness of the area is reducing. However, some plant species produce seeds that retain germination in the soil for a long period of time, so the seed bank may contain species that are no longer situated here or only in a very limited amount in the locality, and therefore the soil seed bank may theoretically be a source of these species and can be used in the restoration of species composition in the locality. In this bachelor´s thesis, a soil seed bank from the largest inland salt marsh in the Czech Republic, located at the southwestern edge of the Nesyt pond in South Moravia, was examined in ex-situ conditions. The subject of the research was mainly the number of individuals of each species germinated from the seed bank. At the same time, it was tested whether the different water level in the substrate affects the abundance of species and species composition of the plants grown from the seed bank. From the soil seed bank of the salt marsh habitat has grown 44 taxa, of which 18 of these taxa are classified as endangered or rare in the Czech Republic. Altogether 1233 individuals of plants were noticed, most of them have been classified as Plantago uliginosa and Juncus compressus, whose individuals constituted more than half of the total number of individuals, while the number of individuals of other taxa ranged from 1 to 10 individuals. Testing the effect of water level on species abundance and species composition showed that more plant species germinated under conditions where the water level was below substrate level than under conditions where the substrate was permanently wetted to flooded.
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