Surgut flora description.

The analysis of vegetation of the young West-Siberian cities is the most topical as the pace of phytocoenoses (plant communities) destruction in these cities are very rapid due to intensive housing development and constant expanding of city limits. City vegetation development is a vivid example of the process of current flora changes under anthropogenic influence.The subject of this work is flora of Surgut. The materials for this article were collected during the author's field studies held in 2002-2010 within the administrative limits of Surgut. The rout method of collecting of the materials was applied. All the main habitats of Surgut were examined including natural and anthropogenic habitats. Standard botanic methods were used for analyzing the collected material. The collected material allowed to carry out floristic analysis of the vegetation, including taxonomic, biomorphologic, ecologic and geographic analyses.Taxonomic analysis of the flora reviled 367 species of vascular plants, related to 220 genera and 67 families. The analysis reflects that Asteraceae, Poaceae, Cyperaceae families are dominant. The presence of these families in the first tirade of genus-family spectrum (range) shows that the city's flora belongs to Golarctic kingdom. The ascertained spectrum (range) of life-forms corresponds to the boreal flora spectra(ranges). Terrain perennial herbs prevail in the spectrum with a significant share of monocarpic herbs. This can be explained by intensive anthropogenic influence on the area under study. Herbaceous plans comprise 90% of the city's flora. Trees, bushed trees, shrubs and under shrubs comprise 11,2%. Mesophytes, mostly represented by eumesophytes, prevail in the flora ecologic spectrum classified by humidification factor (66,8%). Hydrophytes comprise a significant share as well (20,2%). Eutotrophs, mostly represented by mesoeutotrophs, prevail in the flora ecologic spectrum classified by soil active richness and salinity. Chorologic analysis of the flora revealed that it is represented by the species with broad Eurasian and Golarctic areas. The combined share of Eurosibirian, Eurowest-Siberian and Siberian geographic groups comprises 9,3% of the total number of discovered longitude groups. This fact proves that the original specific variety historically attributed to this area has badly preserved. The boreal group prevails among zonal elements which corresponds to the latitudinal position of the city. Due to severe climate, significant quantity of wet and swamp areas and natural undisturbed green areas, as well as constant expansion of city limits, the process of vegetation formation differs greatly from such processes in other Siberian cities.

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