Structure of the adventive component of flora pine forests on the southern limit of Pinus sylvestris

The article is devoted to the characterization of the adventive fraction of pine forests at the southern limit of the range of Pinus sylvestris. Steppe forests of Buzuluksky and Krasnosamarsky and forest-steppe of ones Usmansky and Khrenovskoy were investigated. Taxonomic features have been identified and the classification of the adventive component of the flora by time, the method of skidding and the degree of naturalization has been carried out. The nucleus of the adventive component of forests pine of flora from 37 species of 35 genera of 21 families is determined. Established, the predominance of kenophytes. According to the method of immigration, xenophytes prevail - 78.4%. The degree of naturalization is led by epekophyty. Agriophytes account for almost 25% of the species of the adventive fraction of the boron flora, that enter the nucleus of ones. The least number of species belongs to the agriophytes. Colonophytes in the core are not included.