Zahodno-pontska stepska vegetacija v Bolgariji

The paper presents results of a syntaxonomic analysis of the herbaceous phytocoenoses on the steep stony slopes and the plainy watersheds along the Northern Black Sea Coast and in the internal part of the South Dobrudzha (North-Eastern Bulgaria). The specific patterns of the vegetation in this part of the Balkan-Moesian (Lower-Danubian) forest-steppe province of the Eurasian steppe area is discussed. The comparatively preserved relict steppe vegetation includes relatively high numbers of endemic, rare and threatened species, which is the reason for its importance for conservation of biodiversity and the specific habitats. Two new associations are described: 1) Alysso caliacrae – Atremisietum lerchianae with two subassociations – typicum and camphoresmetosum monspeliacae, and 2) Paeonio tenuifoliae-Koelerietum brevis with three variants. The associations belong to the alliance Pimpinello-Thymion zigoidi – an endemic syntaxon for Bulgarian and Romanian Black Sea coasts.V članku je predstavljena sintaksonomska analiza zeliščnih fitocenoz na strmih kamnitih pobočjih in ravninskih predelih ob severnih obalah Črnega morja in v notranjosti Južne Dobrudže (severovzhodna Bolgarija). Obravnava poseben vzorec vegetacije v tem delu Balkansko-Mezijske (Spodnje donavske) gozdno-stepske province Evroazijskega stepskega območja. Primerljivo ohranjen relikt stepske vegetacije vsebuje relativno veliko število endemnih, redkih in ogroženih vrst, zato je pomemben za ohranjanje biodiverzitete in posebnih habitatov. Opisani sta dve novi asociaciji: 1) Alysso caliacrae-Atremisietum lerchianae z dvema subasociacijama – typicum in camphoresmetosum monspeliacae, in 2) Paeonio tenuifoliae-Koelerietum brevis s tremi variantami. Asociaciji uvrščamo v zvezo Pimpinello-Thymion zigoidi – endemni sintakson na obalah Črnega morja v Bolgariji in Romuniji