Characterization of falling out of cultivation populations of <i>Helianthus tuberosus </i>L. in the Northwest of the Republic of Bashkortostan
The article presents data on a new for the Republic of Bashkortostan alien species that is running wild - Helianthus tuberosus L. In 2016-2019 4 coenopopulations in 3 districts of the Northwest of the Republic of Bashkortostan were examined. The main population characteristics were studied: height, number of shoots per 1 m<sup>2</sup>, above-ground biomass of H. tuberosus , total biomass from 1 m<sup>2</sup> and morphometric parameters in 25 medium-generating individuals. The species invades human-disturbed vegetation and forms derivative communities of Helianthus tuberosus [Artemisietea vulgaris]. The density of shoots in the studied coenopopulations varies from 11,2 to 80,4 pcs/m<sup>2</sup>, biomass - 1,1-2,7 kg/m<sup>2</sup>. The share of the species in the community reaches 97,5%. The variability of morphometric parameters of H. tuberosus ranges from normal to high levels. The vital state of H. tuberosus coenopopulations varies from depressive to prosperous. H. tuberosus becomes a dominant community and can be dangerous to the ecosystems of the Republic of Bashkortostan.