The work is devoted to the study of the cenotic structure of the pine forests flora at the southern limit of the Pinus sylvestris. Particular attention is paid to the adventive fraction of the flora, where the distribution of species by cenotic groups differs significantly from the distribution in its aboriginal fraction. The cenotic groups belonging to the same biogeocenosis (forest, steppe, meadow, etc.) are combined into the corresponding components. It was found that more than half of the species of the adventive fraction of the flora occupy weedy habitats in its secondary range. A significant part of alien species is associated with the cultural cenotic component, which is associated with the active introduction of wood and shrub plants on the territory of pine forests in the last century and the independent spread of some of the cultivated plants outside the economic areas. In components and groups of natural coenoses, the percentage of advent is low. More resistant to advent was the swamp component with swamp and meadow-bog cenotic groups and a edge component with swampi-fringe and coastal-fringe cenotic groups. The steppe component is less stable. It is established that in the pine forests of the forest-steppe zone the share of advent in the steppe component is higher than in the steppe borons. In the forest and pine forests component, the proportion of advent in the forest-steppe forests decreases, but in the steppe forests it increases. Based on the data obtained, there is reason to believe that steppe communities are more resistant to the penetration of alien elements in steppe burs that are affected by the climate of the steppe zone. On the contrary, steppe components are more accessible in the pine forests of climatic conditions of the forest-steppe zone for the introduction of representatives of the adventive fraction of the flora into their plant communities.

For citation:

Kin N.O. Resistance of Natural Pine Forests Cenoses at the Southern Limit of the Range of Pinus sylvestris to Alien Floral Elements. The Bulletin of Irkutsk State University. Series Biology. Ecology, 2018, vol. 23, pp. 32-42. DOI: https://doi.org/10.26516/2073-3372.2018.23.32 (in Russian)

DOI

https://doi.org/10.26516/2073-3372.2018.23.32

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