GEOBOTANICAL CHARACTERISTICS OF THE COMMUNITIES FORMED BY FILIPENDULA ULMARIA (L.) MAXIM. AND FILIPENDULA DENUDATA (J. ET C. PRESL) FRITSCH IN BELARUS

It have been considered Filipenduletum ulmariae (Shvergunova et al. 1984) and Filipenduletum denudatae ass. nova communities formed by phytocenotically replaceable species of Filipendula ulmaria (L.) Maxim. and F. denudata (J. et C. Presl) Fritsch in Belarus. Both syntaxons are documented by a synoptic table (with the release of a block of ecological and other indicators of communities) and are characterized by certain floral composition, diagnostic species, synmorphology, horology and habitat conditions. The floral similarity index of associations Filipenduletum ulmariae and Filipenduletum denudatae equals to 0.66 and 0.75 respectively. The argument for the syntaxonomical distinction of communities is the presence of own groups of differential species (acidophils prevail in the first association, nitrophils – in the second one), differences in productivity (the yield of aboveground biomass of herbage of Filipenduletum denudatae community is twice or more higher than Filipenduletum ulmariae) and ecological regime of ecotope (Filipenduletum denudatae community is more synanthropic), horologycal features.

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