ON NEW SEGETAL PLANT ASSOCIATION OF THE PERM REGION
As a result of geobotanical survey, we have revealed the diversity of segetal plant communities in the Perm region with more than 200 geobotanical descriptions performed. Field research has been conducted within the forest zone of the southern Perm region where major agricultural enterprises are concentrated. This territory includes the Lower Kama and Iren agri-natural areas and belongs to the High Trans-Volga province of the East European Plain according to its physico-geographical zoning. Syntaxonomic analysis of the materials makes it possible to present the revealed diversity in the unit system of the eco-floristic classification of Eurasian plants. The communities in question are combined into a single association Conioum maculatum - Stachietum palustris ass. nov. The association refers to class Papaveretearhoeadis S. Brulo et al. 2001, order Aperetalia spica-venti J. Tx. et Tx. in Malato-Belizetal. 1960 and alliance Scleranthion annui (Kruseman et Vlieger 1939) Sissinghin Westhoff et al. 1946. Comparative analysis of coenofloristic communities of the South and Middle Urals shows their unique peculiarity in the Perm region. They contain a group of species that can be found in the communities of neighbouring regions with less abundance and constancy ( Artemisia vulgaris, Stachys palustris, Conium maculatum, Tussilago farfara, Crepis tectorum, Pastina casativa, Erysimum cheiranthoides, Lapsana communis, Equisetum arvense, Carduus crispus, Rumex pseudonatronatus, Veronica arvensis ) . In total, we have found 124 vascular plant species among the coenoflora of the segetal communities in the Perm region. It is shown that a greater part in the floristic composition of the communities is taken not by actually segetal species, but apophytes from natural and quasi-natural vegetation. The coenotic spectrum includes predominantly meadow-forest edge (38%) and forest (11%) communities. Ruderal species have also a high proportion (15%). In the Perm region, the floristic composition of the communities includes with high constancy such invasive species as Heracleum sosnowskyi and Lupinus polyphyllus listed in the Black Book f the flora of Central Russia.