Abstract
The paper presents the syntaxonomical analysis of calcareous steppes of the Don Basin (Rostov Region, Russian Federation), that are formed on chalky soils and carbonate rocks. The species composition of communities are characterized by combination of widespread steppe xerophytes and calciphytes, which are common in thyme coenoses with the dominance of dwarf semishrubs and in bunchgrass steppes. Within the system of phylocoenogenetic classification (Kamelin, 2005) such conenoses are regarded as a distinct steppe subtype (Steppae creta-petrophile).
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