Features of the vegetation cover of some populations in the north of Western Siberia.
The article discusses the features of the formation of vegetation in cities (Nadym, Novy Urengoy) and villages (Pangody, Pravokhetinsky) in the north of Western Siberia. Despite the close subzonal position of the settlements, no tendencies for the unification of their floras have been revealed. Even in the case when the settlements belonged to the same geobotanical subzone, the similarity in the composition of their flora was 40-47%. PCA ordination of 73 geobotanical descriptions, as well as the results of analyzes of soil samples showed that the leading factors influencing the differentiation of vegetation by functional urban zones (industrial, recreational, residential) are soil conditions: acidity, content of mineral nutrients, moisture. The vegetation of the functional zones of cities is united by a small pool of frequently occurring apophyte species, with a wide ecological amplitude and high potential for the development of various secondary biotopes. The instability and dynamism of the species composition of urban vegetation was traced using the example of three settlements over a 25-year period of time. During this period, a significant contribution to the formation of the peculiar appearance of the vegetation of residential and recreational zones was made by the growing activities for the improvement of territories: the use of lawn grass mixtures, the introduction of fertilizers and planting of introduced species, as well as the spontaneous and unintentional introduction of new adventive species.