Abstract
New association Dicranoweisio-Deschampsietum ass. nov. with 2 variants within the class Salicetea herbaceae Br.-Bl. 1947 is described for the cold desert belt of the Putorana plateau (Srednesibirskoe plateau). Its species composition represents the combination of species character for both the snow beds in the northern part of Taymyr peninsula (ass. Deschampsio-Cerastietum regelii Matveyeva 1994) and zonal vegetation of the polar deserts (асс. Aulacomnio-Deschampsietum prov., unpublished author’s data) on Bolshevik Isl. (Severnaya Zemlya Archipelago) with common dominating tufted grass Deschampsia borealis. Compare to the mentioned associations it is poorer in species numbers within all groups of plants (vascular, mosses, liverworts, lichens) due to the restricted number of plain arctic species. Its horizontal structure demonstrates a larger similarity with the polar desert communities.
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