Syntaxonomy of subalpine tall shrub Alnus alnobetula subsp. fruticosa (Rupr.) Raus communities in mountains of the north-western part of the Altai-Sayanian region

The classification of subalpine shrub (Alnus alnobetula subsp. fruticosa) communities of north-eastern  part of the Altai-Sayanian mountain region was conducted. The association Calamagrostio obtusatae–Alnetum  alnobetulae ass. nov. was described. It was demonstrated that all existing Altai-Sayanian associations of  subalpine Alnus alnobetula shrub communities should be included in the class Betulo carpaticae–Alnetea viridis  Rejmanek ex Boeuf et al. 2014 and order Doronico altaicae–Alnetalia alnobetulae ord. nov. The floristic  peculiarity of the new order is determined by North-Asian and Altai-Sayanian subalpine and subalpine-forest  species: Alnus alnobetula subsp. fruticosa, Allium microdictyon, Aquilegia glandulosa, Anthoxanthum  nipponicum, Bergenia crassifolia, Betula glandulosa, Bistorta officinalis subsp. officinalis, Carex aterrima,  Doronicum altaicum, Euphorbia pilosa, Lonicera altaica, Micranthes nelsoniana subsp. aestivalis, Pedicularis  incarnata, Poa sibirica, Rhododendron aureum, Saussurea latifolia, Solidago dahurica,Viola altaica. The  associations Athyrio distentifoliae–Duschekietum fruticosae Zibzeev et Nedovesova 2017, Bergenio crassifoli–  Duschekietum fruticosae Zibzeev et Nedovesova 2017, Carici iljinii–Duschekietum fruticosae Zibzeev et  Nedovesova 2017, Calamagrostio obtusatae–Alnetum alnobetulae ass. nov. and community Duschekia fruticosa  were included in the alliance Aquilegio glandulosae–Alnion alnobetulae all. nov. The association Doronico  altaici–Duschekietum fruticosae Lashchinskiy 2015 was included in the alliance Athyrio filicis-feminae–Alnion  alnobetulae all. prov. The high floristic peculiarity of the higher units was supported by results of DCA  ordination. 

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