Artemisia sieversiana is an adventive species, for which both ruderal and fallow, near-house plots can serve as an ecotope. The most characteristic habitat of Artemisia sieversiana are deposits, this is where it acts as one of the background species, forming diverse communities and coenopopulations. Also, this species is considered a valuable medicinal plant of folk and Tibetan medicine.The material was collected on the deposits of the tract of the Upper Kuitun of the Barguzin Valley (Baikal region) in the summer of 2016. The floristic composition of siberopolyn communities consists of 65 species of higher vascular plants. A systematic analysis of the coenoflora revealed that the Asteraceae family dominated by species (22.8%). The leading position of this family is due to the diversity of polymorphic species of the genus Artemisia L., whose representatives are often found in the conditions of deposits. In the classification, 15 geobotanical descriptions were used with the participation and dominance of Artemisia sieversiana. The abundance of species was counted on the Brown-Blanque scale. The dominant-determinant approach with the main taxonomic units – the florocenotype, formation, and association — was used. Diagnostic groups of species that clearly react to changes in environmental factors are taken as determinants. Their presence makes it possible to distinguish between close phytocenoses into groups, which is the main criterion for the isolation of syntaxons. In identifying groups of communities similar in species composition, cluster analysis was used in the PAST program, the final material of which is presented in the form of a dendrogram. As a result of the classification, 5 associations were identified:1. Elytrigia repens + Artemisia sieversiana + Artemisia scoparia, 2. Convolvulus arvensis + Lappula squarrosa, 3. Artemisia scoparia + Artemisia sieversiana + Atriplex fera, 4. Elytrigia repens + Cleistogenes squarrosa + Chamaerhodos grandiflora, 5. Elytrigia repens + Lappula squarrosa. The associations obtained refer to such formations as wormwood, convolvulcidae, and wheatgrass. In turn, the identified formations belong to two florocenotypes – these are bovine and rhizomatous deposits.

Sakhyaeva Ayuna Bulatovna, Postgraduate, Buryat State University, 24a, Smolin st., Ulan-Ude, 670000, Russian Federation, tel.: (3012) 21–15–93, e-mail: ayuna.sahyaeva@mail.ru 

Namzalov Bimba Batomunkuevich, Doctor of Science (Biology), Professor, Buryat State University, 24a, Smolin st., Ulan-Ude, 670000, Russian Federation, tel.: (3012) 21–15–93, e-mail: namzalov@rambler.ru

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Artemisia sieversiana, plant association, association, sod field vegetation, Barguzin Valley

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