I4 - Open vegetation of shadowed rocks - Árnyéktűrő nyílt sziklanövényzet (HU)

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I4 – Open vegetation of shadowed rocks:
These, characteristically open, mesic, pioneer communities – often with well-developed moss layer – occur on shadowed rock outcrops, rock cliffs, screes, periglacial block streams (usually facing to the north). The abiotic parameters and the lack of the soil do not offer suitable conditions for the mass spread of perennial grass, shrub, and tree species, and in this way neither to the evolution of rock grasslands, thickets and forests. Due to the occurrences on rock cliffs, the extension of the habitat can hardly be interpreted; consequently, for this habitat also the frequency of occurrences is a better descriptor of its distribution than the extension in hectare. It is most common in the Északi-középhegység (190 occurrences), it can be found with the greatest number in Bükk, Mátra, Sátor-hegység and Börzsöny, but occurs also on Aggteleki-karszt and on the Heves-Borsodi-dombság. More infrequent in the Dunántúli-középhegység (approx. 60 stands), mainly in the highest parts (Bakony, Pilis, Visegrádi-hegység), and very rare in other regions (Keszthelyi-hegység, Balaton-felvidék, Gerecse, Budai-hegység). There are some stands in Mecsek, and only one stand was found in the Kőszegi-hegység.



Molnár, Zs., M. Biró, J. Bölöni & F. Horváth (2008): Distribution of the (semi-)natural habitats in Hungary I.: Marshes and grasslands, Acta Botanica Hungarica 50 (Suppl): 59-105. >>> letöltés (5,4 MB, PDF)



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