The effectivity of anti-flood technology indicated by vegetation in a hydrologically managed forest
AbstractIn the Tatra Mts., approximately 5,000 water-holding dykes of different types were set up in the territory of 87 hectars, covering wind disaster area including burnt forest. During 2007-2009 a comprehensive vegetation investigation of inundation zones of 255 water-holding dikes took place. Ten vegetation types arising in the dike inundation zones were identified. For every plant community covering inundation zone, was calculated weighed mean of Ellenberg´s indicator plant´s values for environmental characteristics - light, temperature, continentality, moisture, acidity, nitrogen. The research was focused to in floristical composition of investigated dikes during 2007-2009. Using ordination methods, the relationships between environmental characteristics and vegetation types, types of dykes or supplementary environmental variables recorded in the field, like slope or increase in number of species in 2007-2009 were searched. Some wide-spread vegetation types show positive tendencies to moisture, e. g. vegetation types Horsmat (Epilobium), another nitrogen content, e. g. Red Raspberry (Rubus idaeus). With respect to the moisture, the triangular or semicircular dykes proved more efficient than the contour ones. Natural regeneration in the dike inundation zones related to environmental characteristics or vegetation types were analysed. The hygrophilous vegetation type Horsmat (Epilobium) achieved the highest increase in species diversity.
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