New syntaxa of tundra vegetation in the Siberian sector of the Arctic

Vegetation of spotted dwarf shrub-sedge-moss and dwarf shrub-lichen communities in the southern tundra subzone of the Taymyr Peninsula is assigned to 3 associations, including 2 new ones. For comparison, we used previously published relevés of ass. Hierochloo alpinae–Hylocomietum splendentis Telyatnikov, Troeva, Ermokhina et Pristyazhnyuk 2019 with 2 subassociations and 3 variants, into which the authors combined spotted dwarf shrub-lichen-moss communities on sandy loam soils and dwarf shrub-lichen communities on sandy soils on the Gydanskii and Tazovskii Peninsulas. As a result of the revision of these syntaxa and their comparison with new materials from the Taymyr Peninsula, we have revised some syntaxonomic decisions. The zonal vegetation is assigned to 2 associations: ass. Carici arctisibiricae–Hylocomietum alaskani Matveyeva 1994 (with regular-cyclic horizontal structure: patches of bare ground – rims – small troughs) and a new ass. Arctagrostio latifoliae–Caricetum arctisibiricae Telyatnikov et al. ex Lavrinenko in Lapina et Lavrinenko ass. nov. hoc loco (with continuous sedge-moss cover) in the class Carici arctisibiricae–Hylocomietea alaskani Matveyeva et Lavrinenko 2023. Dwarf shrub-lichen communities on sandy soils are assigned to a new ass. Asahino chrysanthae–Salicetum nummulariae (Khitun in Telyatnikov et al. 2021) Lapina et Lavrinenko ass. nov. (stat. nov.) hoc loco in the class Loiseleurio procumbentis– Vaccinietea Eggler ex Schubert 1960.