Defining role of Filipendula ulmaria on meadows in the delta of the Northern Dvina river within the alluvial lithogenic matrix

Ecological and floristic peculiarities of meadows with Filipendula ulmaria dominant is introduced (formed on alluvial soils in the Delta of the Northern Dvina river). Results based on the analysis of geobotanical descriptions and data field experience. Leading environmental factors that affect these meadows was selected. Set the distribution of types in accordance with the phytocoenotic importance. Lowest species richness, number of species per square meter, data about the quantitative and qualitative indicators of productivity are presented. Role of meadowsweet as edificator is highlighted.