Resource assessment of the cenopopulations of Sanguisorba officinalis L. in the Surgut District of the Khanty-Mansi Autonomous Okrug - Yugra

Great burnet (Sanguisorba officinalis L.) is a valuable medicinal, melliferous and ornamental plant. Natural populations of this species are quite rare in some regions of Russia. The article presents an assessment of the current state of S. officinalis coenopopulations in the Khanty- Mansi Autonomous Okrug – Yugra, Russia. The age structure of S. officinalis coenopopulations was studied, and the biological and exploitable reserves of S. officinalis plant material in various plant communities of the Surgut District of the Khanty-Mansi Autonomous Okrug – Yugra were determined. S. officinalis coenopopulations mainly consist of young (39.8–95.8% of pregenerative) individuals, which can be explained by the confinement of this species to floodplains with their characteristic systematic flooding. The cereal-burnet willow floodplain and the willow-forb swampy floodplain are promising locations for collecting raw materials, as S. officinalis occupies a significant part of the herbaceous layer in these areas (with total projective cover of about 30% and 20%, respectively). The density of moderately and weakly self-sustaining plant populations is 6.5 and 10.4 pcs/m2, respectively. On average, the biological raw material reserve is 41.12 kg and 73.66 kg; the operational reserve is 32.8 and 62.62 kg; the possible volume of raw material procurement is 2.98 and 5.69 kg. The specific raw material phytomass of the underground part of plants is 205.6 and 368.3 g/m2. The predominance of young unstable populations of S. officinalis is observed, which limits the possibility of harvesting medicinal raw materials in the Surgut District.