Syntaxonomy of halophytic vegetation of seashore part of the Kilian Danube Delta (Odesa Region) is presented. Vegetation of the studied area is represented by four associations belonging to three classes: Festuco-Puccinellietea, Thero-Salicornietea and Salicornietea fruticosae. A new association, Poo bulbosae-Artemisietum santonicae, is described with three subassociations. Communities of this association are formed on old fallows under considerable grazing impact, have some features similar to the wormwood desertified Black Sea steppes on salt soils and belong to the Festuco-Puccinellietea class. Subassociations typicum,  artemisietosum austriacae, and camphorosmetosum monspeliacae differ by floristic composition and ecological location. Damping shifts and salt soil regime are the determinant factors of ecological differentiation of subassociations. Communities of solonchaks located near the wetland periphery area and in local depressions are represented by associations Salicornio perennantis-Suaedetum salsae (Thero-Salicornietea class), Halimionetum verruciferae and Salicornio prostratae-Halocnemetum strobilaceae (Salicornietea fruticosae class). Characteristics of the found syntaxa is provided. Phytoindication assessment of the habitat condition was accomplished and principal factors of ecological differentiation (damping shift, salt regime, acidity, aeration and soil humidity) of the described syntaxa were identified.

Keywords: syntaxonomy, halophytic vegetation, Festuco-Puccinellietea, Thero-Salicornietea, Salicornietea fruticosae, ecological differentiation, seashore part of the Kilian Danube Delta

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