Effect of the Bílovka river revitalization on the vegetation

Vegetation sampling of 45 vegetation relevés was done on transects situated orthogonal to the Bílovka river in its renaturalized section during vegetation season in 2014. Vegetation of reeds and tall sedges dominated in close proximity to the river (Rorippo-Phalaridetum arundinaceae and Phalaridetum arundinaceae). Alluvial meadow communities (Poo trivialis-Alopecuretum pratensis and Holcetum lanati) were recorded further from the river.
Among total 121 taxa, there were 97 native species, 17 archaeophytes and 7 neophytes. The new locality of Thalictrum lucidum, an endangered taxon (C3) growing in the community Phalaridetum arundinaceae, was recorded. The highest species richness was found in close proximity to the river and it was decreasing with increasing distance. Negative correlation has been confirmed between the number of both native species and neophytes and the distance from the river. The factor of mowing reduces number of archeophytes. Succession after revitalization of the Bílovka river occurs through the natural vegetation types. Nevertheless, there is apparent strong riverbed clogging and abundant population of Typha latifolia grows directly in the riverbed. Highly invasive species such as Impatiens glandulifera, Rudbeckia laciniata and Robinia pseudoacacia can become a threat in the future.