CHANGES IN FLORA SPECIES COMPOSITION AND SOIL ENZYME ACTIVITY IN COMMUNITIES OF ACER NEGUNDO IN THE KEMEROVO REGION

The article presents the study results of the species composition of vascular plants and soil activity in communities dominated by Acer negundo . The studies were carried out on accounting sites located in the mountain-taiga and forest-steppe zones of Kuzbass. The selection of trial plots was made taking into account the horizontal differentiation of space into under-crown (registration plots) and external zones (control) of phytogenic fields. Floristic descriptions and analysis of the soil by the level of activity of enzymes (invertase, protease, phosphatase) were carried out using standard methods. The species diversity of vascular plants in the areas under study constituted 64 species. The dominant plant species in the ash-leaved maple communities were identified. Under the canopy of A. negundo , ruderal species - Cirsium setosum, Elytrigia repens, Lamium album, Urtica dioica, and Taraxacum officinale - dominate, while in the outer zones, the proportion of meadow species increases - Achillea millefolium, Dactylis glomerata, and Festuca pratensis . It has been established that the floristic composition of communities does not affect significantly the level of activity of soil enzymes. In the undercrown space of A. negundo , an increase in the activity of hydrolytic enzymes by an average of 11% was noted, compared with the outer zones.