Abstract
In the article the phytocoenotic activity of species of the genus Rumex L. in the space of 5 syntaxa of meadow vegetation in the Bryansk Region assessed. Based on geobotanical materials collected in 2018–2022 two new associations and one subassociation were established, for which high activity of Rumex acetosella and R. thyrsiflorus was revealed. The maximum activity (V3–5) of R. acetosella is characterized for the ass. Koelerio delavignei–Festucetum rubrae Rumex acetosella var., R. thyrsiflorus – the ass. Trifolio arvensis–Rumicetum thyrsiflori (V1–5) and the ass. Kadenio dubiae–Rumicetum thyrsiflori (V5). R. acetosella reaches the highest abundance-coverage on dry and poor soils, while R. thyrsiflorus naturally increases the abundance-coverage under more mesophytic conditions. High activity of R. acetosella and R. thyrsiflorus was revealed in grass plant communities in xerophytized river floodplains. This change in the moisture regime against the background of a reduction in the duration and height of floods, as well as the lack of haymaking and grazing in floodplain locations in recent decades, contributed to an increase in the activity of the studied species. In the future, if the trend towards xerophytization of the floodplains persists, we can expect the stable positions of these species to remain in meadow grass stands.
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