The effect of restoration and drainage on the botanical composition of humid marsh thistle meadows under different management systems
2007
Duffkova, R.,Vyzkumny Ustav Melioraci a Ochrany Pudy, Prague (Czech Republic) | Lexa, M.,Vyzkumny Ustav Melioraci a Ochrany Pudy, Prague (Czech Republic)
We evaluated the effect of previous drainage and restoration on the present botanical composition of humid marsh thistle meadows of the association Angelico-Cirsietum palustris (Vysocina Region, Czech Republic) in relation to different methods of management (one-cut, two-cut and no-cut treatments). The multivariate analysis of data was done by the Canoco 4.5 software (direct redundancy analysis RDA). Three localities were assessed: 1) undrained locality with grassland corresponding to the site conditions (L1), 2) restored locality with drainage system (out of operation for the last five years, L2), 3) restored locality, the drainage system was used for water retardation (out of operation for the last five years, L3). The botanical composition was influenced mainly by the locality: its effect explained 35.8% of the variability. The elevation of groundwater level as a result of the drainage system choking markedly increased the number of species (including indicator ones) in L2. Two-cut management was the best, while one-cut management was an acceptable compromise concerning the species number and grassland composition. The effect of grassland management on botanical composition explained 23.3% of species variability. No-cut and two-cut treatments contributed to the greatest differentiation of the species composition.
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