M.V. Kozhevnikova*, V.E. Prokhorov**, T.V. Rogova***
Kazan Federal University, Kazan, 420008 Russia
E-mail: *MVKozhevnikova@kpfu.ru, **vadim.prokhorov@gmail.com, ***tatiana.rogova@kpfu.ru
Received July 6, 2017
Abstract
The paper is devoted to the development of an algorithm for classification of plant communities of the Republic of Tatarstan in the Braun-Blanquet system. The steppe oak forests – the unique ecotone communities, which are the reserves of many protected plant species – have been used as the model object to create the above-mentioned algorithm. The algorithm for initial determination of vegetation syntaxa based on the modified TWINSPAN method has been proposed. A total of 183 relevés from the FLORA Information and Analytical System have served as the initial data. As a result of the research, three associations belonging to two alliances of the class Quercetea pubescentis Doing-Kraft ex Scamoni et Passarge 1959 that are distributed within the territory of the Republic of Tatarstan have been preliminarily identified.
Keywords: Braun-Blanquet classification, steppe oak forests, TWINSPAN, FLORA Information and Analytical System, Republic of Tatarstan, Quercetea pubescentis
Acknowledgments. We are grateful to M.B. Fardeeva and G.A. Shaikhutdinova, who performed the geobotanical descriptions, for the opportunity to use their materials during the research.
Figure Captions
Fig. 1. Differences between the classification hierarchies based on the (a) traditional and (b) modified TWINSPAN algorithms [45].
Fig. 2. The tree diagram obtained as a result of the processing of the geobotanical descriptions by the modified TWINSPAN method. The segment length along the X-axis shows the number of descriptions included in the cluster.
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For citation: Kozhevnikova M.V., Prokhorov V.E., Rogova T.V. Xeromesophytic broad-leaved forest communities of the Republic of Tatarstan in the hierarchy of syntaxa within the Braun-Blanquet system. Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2018, vol. 160, no. 3, pp. 445–458. (In Russian)
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