Syntaxonomical and hydrological characteristic of downy willow ( Salix lapponum ) scrubs spread on the Ob River floodplain within the limits of middle taiga subzone is given. The willow scrubs are studied in Surgut (near Surgut) and Nizhnevartovsk (the Yermakovsky Yogan River lower course) districts of Khanty-Mansi Autonomous Area, Russia. The willow scrubs belong to association Carici aquatilis-Salicetum lapponum Taran 1993 ( Alnetea glutinosae ). They are divided into 2 subassociations: boggy (subass. typicum , var. typicum and Carex lasiocarpa ) and meadow-boggy ( Carici aquatilis-Salicetum lapponum juncetosum filiformis Taran, Tyurin et Dyachenko 2016). Near-Surgut boggy downy willow scrubs (var. Carex lasiocarpa ) are located on peats with thickness 144-164 cm and on height 682-692 cm above Surgut gauge zero. Their yearly flood frequency for 1979-2016 is 51-59%, maximum flood duration - 73-75 days (2007), mean flood duration for years when the willow scrubs were flooded (ever if their lower levels only) is 38-43 days. Maximum flood height for the years is 182-192 cm, mean flood height - 48-57 cm above soil surface. Near-Surgut meadow-boggy downy willow scrubs are located on height 604-619 cm above Surgut gauge zero. Their yearly flood frequency for 1979-2016 is 86-95%, maximum flood duration for the period - 94-96 days (2007), mean flood duration is 52-57 days. Maximum flood height for the years is 255-270 cm, mean flood height - 84-98 cm above soil surface. The Yermakovsky Yogan boggy downy willow scrubs (var. typicum ) are located on peats with thickness 45-75 cm and on height 754-789 cm above Nizhnevartovsk gauge zero. In flood frequency and duration respect, they occupy intermediate position between boggy and meadow-boggy downy willow scrubs from Surgut vicinities: yearly flood frequency for 1979-1993 is 80-87%, maximum flood duration - 72-77 days (1979), mean flood duration is 44-57 days. The Yermakovsky Yogan boggy downy willow scrubs are flooded on bigger height than near Surgut: maximum submersion height is 281-316 cm, mean submersion height for years when the willow scrubs were flooded is 84-117 cm above soil surface.
sintaksonomiya, kustarnikovye ivnyaki, poymennye bolota, polovod'ya, podzona sredney taygi
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