On bryoflora of the Ob river floodplain forests in south Taiga subzone

In the Ob River floodplain in vicinity of Kolpashevo town, Kolpashevo district ofTomsk Region (58.18′ north, 82.54′ east), 58 moss species, including 56 species in forestsand 3 ones in meadows and fens, are revealed. Among the most interesting records,Bryum moravicum is first found in Tomsk Region and taiga part of Western Siberia andalso Brachythecium capillaceum, Bryhnia scabrida, Rhytidiadelphus subpinnatus andZygodon sibiricus are first registered in the Ob River floodplain within the limits ofTomsk Region. 31 species are revealed in willow (Salix alba) forests, 34 - in poplar(Populus nigra, P. alba) forests, 17 - in aspen (Populus tremula) forests, 44 - in birch(Betula pendula, B. pubescens) forests, 24 - in Scotch pine (Pinus sylvestris) forests and21 moss species in bird cherry tree (Padus avium) cenosis.Within the limits of a standard plot measuring 1 are (100 m2), from 3 to 23 moss speciesare registered in willow forests (on average 14,4 species per are), 8-23 ones in poplarforests (14,4 species/are), 9-16 ones in aspen forests (12,5 species/are), 19-26 onesin birch forests (23,4 species/are), 6-19 ones in Scotch pine forests (13,0 species/are).69,4% of the forest muscoflora is concentrated in epiphytic layer, 87,5% is done inground layer. Compared to epiphytic layer, ground layer of the different forest formationsis characterized by higher total species richness and also higher average speciesrichness per are. Distribution of epiphytic mosses on phorophytes is considered in5 groups of wood species: willows (Salix alba, S. dasyclados, S. viminalis), poplars, aspens(Populus tremula, P. canescens), bird cherry tree, birches. Scotch pine and regrowthof Siberian cedar (Pinus sibirica) and spruce (Picea obovata) are registered asphorophytes only in one of the relevees. Within the limits of a standard plot measuring1 are (100 m2), from 1 to 9 moss species are registered on willows (on average 6,7 speciesper are), 6-10 ones on poplars (8,2 species/are), 4-6 ones on aspens (5,0 species/are), 6-8 ones on bird cherry tree (7,0 species/are), 6-17 ones on birches (9,4 species/are). 8 species are registered on Scotch pine, 2 and 4 species are done on regrowthof Siberian cedar and spruce correspondingly.By the total species richness, number of species per 1 are and the degree of the developmenton the ground and fallen trees, bryocomponent of the Kolpashevo area floodplainforests is naturally inserted into the overall picture of these showings changes inthe geographical space of the Ob floodplain from forest-steppe zone (Altai Territory) tothe middle taiga subzone (Khanty-Mansiysk autonomous district, Surgut city vicinity).Average projective cover of mosses on ground and fallen trees, total species richness ofmosses and average number of species per an are plot increase in like forest formationsfrom south to north. This regularity is broken in the lower Ob River floodplain(Elizarovo village) that is conditioned by sudden change of the Ob River hydrologicaland temperature regime owing to the confluence of the Irtish waters.

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