Unflooded forests of the Ob river floodplain on the north of Tomsk region

Study area is located in the vicinities of Novonikolskoye village (59°45'05" north, 79°11'56" east, Aleksandrovsky distrist of Tomsk Region, middle taiga subzone). Forest communities of an-cient riverine ridges of the Ob holocene channel, inner-floodplain cut-off lobes and above-floodplain terrace edge zone are characterized. Cedar pine, cedar pine-spruce, birch-cedar pine, fir and Scotch pine forests attributed to the Vaccinio-Piceetea Br.-Bl. in Br.-Bl., Siss et Vlieger 1939 are spread on the cut-off lobes and above-floodplain terrace edges. On the Ob holocene channel ancient riverine ridges and in the above-floodplain terrace edge zone, extrazonal (south taiga subzonal) Scotch pine-birch-aspen and cedar pine-aspen forests with forb-sedge (Pteridium aquilinum, Carex macroura, Rubus saxatilis, Thalictrum minus, Pleurospermum uralense, Aconitum septentrionale, Lilium pilosiusculum) field layer are sometimes noted. In syntaxonomical relation, they belong to the Lathyro gmelinii-Pinion sylvestris Ermakov in Ermakov et al. 1991, Carici macrourae-Pinetalia sylvestris Ermakov et al. 1991, Brachypodio pinnati-Betuletea pendulae Ermakov et al. 1991. Considerable inter-est has the record of the wet Scotch pine forest with lower layers dominated dwarf shrubs (Vaccinium uliginosum, Ledum palustre, Chamaedaphne calyculata, Andromeda polifolia) and green mosses (Pleurozium schreberi, Hylocomium splendens, Polytrichum commune). The forest is attributed to the Vaccinio uliginosi-Pinetum sylvestris Kleist 1929, (Phyllodoco-Vaccinion Nordh. 1936, Cladonio-Vaccinietalia K.-Lund 1967, Vaccinio-Piceetea). Nearest localities of the association are noted in European part of Rus-sia. On the whole, 105 species of vascular plants, 5 species of liverworts (Ptilidium pulcherrimum, Crossogyna autumnalis, Lepidozia reptans, Lophocolea heterophylla, Radula complanata) and 31 species of mosses were revealed in the studied forests.