ASSOCIATION OF PSAMMOPHYTIC STEPPES OF MINUSINSK FOREST BENDS
Mariya A. Polyakova1, Nikolay B. Ermakov1,2,3,4
1Central Siberian Botanical Garden SB RAS, Novosibirsk, Russia
2Nikitsky Botanical Gardens - National Scienti c Center of Russian Academy of Sciences, Yalta, Russia
3Khakass State University N. Katanov, Abakan, Russia
4Maykop State Technological University, Maykop, Russia
Keywords: steppes, forest bends, ecological-floristic classification, Minusinskaya basin, Siberia
Abstract
The psammophytic steppe community occurring on fluvio-glacial deposits in the Minusinskaya intermountain basin was classified as the association Pulsatillo turczaninovii-Caricetum korshinskyi ass. nov. within the class Festuco-Brometea Br.-Bl. et Tx. 1943 , order Brachypodietalia pinnati Korneck 1974 and alliance Veronici incanae-Helictotrichion desertorum Korolyuk et Makunina in Korolyuk 2007 . It occupies only dry convex parts of southern slopes of sandy dunes surrounded by extra-zonal pine forests. DCA ordination showed floristic differences between two variants of association. The less oligotrophic and more xerophytic variant of Poa botryoides is characterized by a well-developed grass layer with dominance of Poa botryoides , Achnatherum sibiricum , Dianthus versicolor , Carex pediformis , Cleistogenes squarrosa , Bupleurum scorzonerifolium . The second variant of Abietinella abietina is characterized by a poorly developed of grass layer and the constant presence of mosses and lichens ( Abietinella abietina , Rhytidium rugosum , Cladonia arbuscula , Peltigera canina ). The analysis of DCA axes and floristic composition demonstrated importance of substrate type and humidity regime as main factors for differentiation of variants. In addition, the specificity of the species composition of steppe communities is determined by the surrounding forest communities, which introduce their characteristic species - Rubus saxatilis , Maianthemum bifolium , Fragaria vesca , Agrimonia pilosa , Potentilla humifusa , Vaccinium vitis-idaea , Goodyera repens , Chimaphila umbellata , Orthilia secunda , Neottianthe cucullate .
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