Floristic classification of mesophilous broad-leaved forests of Carpinion betuli Issl. 1931 em Oberd. 1953 union in the basin of lower Sula
Introduction. The oak and hornbeam forests of Ukraine are thoroughly trained by the row of scientists. In the lower river basin of Sulа composition of forests with participation of hornbeam is trained fragmentary.
Purpose. Syntaxonomic analysis of the vegetation of oak-hornbeam forests in the basin of lower Sula.
Methods. The analysis is based on 60 geobotanical descriptions.
Results. All hornbeam-containing forests in this region belong to Carpinion betuli union, and within it – to subunion Aceri campestre-Carpinenion. There have been registered four associations (Asaro europaei-Carpinetum, Galeobdolono luteae-Carpinetum, Carici michelii-Carpinetum, Tulipo biebersteinianae-Carpinetum) and eight sub-associations. Geographical differentiation of vegetation is represented by associations; sub-associations represent the edaphic differentiation. Principal for oak-hornbeam forests of the region is the Asaro europaei-Carpinetum association which includes such sub-associations as xero-mesophylic (A.e.-C.b. cystopteritosum fragili subass. nova prov.), mesophylic (A.e.-C.b. typicum), nitrophylic (A.e.-C.b. sambucetosum nigrae subass. nova prov.) and hygro-mesophylic (A.e.-C.b. stachyetosum sylvaticae). The Galeobdolono luteae-Carpinetum association here reaches the south-eastern border of its range and is rarely found. The existence in nature of Asaro europaei-Carpinetum and Tulipo biebersteinianae-Carpinetum associations is confirmed. Тhe last one is referred in literature as provisory.
Conclusion. Our study has considerably widened its range. Such associations as Carici michelii-Carpinetum and Tulipo biebersteinianae-Carpinetum include rare species while occupying small areas and therefore need protection. Among Red List species growing in the forests of the considered union we can mention Tulipa quercetorum, Allium ursinum, Epipactis helleborine, Platanthera bifolia; among regionally-rare – Cerasus avium, Crataegus ukrainica, Corydalis cava, C. marschalliana, Dentaria bulbifera, D. quinquefolia, Scilla bifolia, S. siberica, Muscari neglectum, Vinca minor, Aeogonychon purpureo-caeruleum, Galeobdolon luteum, Campanula persicifolia, Convallaria majalis.
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