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LY1 – Forests of ravines (mesic rocky forests rich in Acer pseudoplatanus):
Forests of ravines are submontane, rocky habitats with rock streams, connected to cool, humid climate, occur generally on limestone in Hungary, on steep slopes of rock debris (or in the bottom of the valleys), with leaking water and rock outcrops. Fraxinus excelsior, Acer platanoides, A. pseudoplatanus are the most characteristic tree species of this high-growing (20-30 m) forest. Beech, Ulmus and Tilia species are frequent associate species. This is an infrequent habitat; its total area is less than 500 ha in the country. It reaches the largest extension in the Északi-középhegység (approx. 350 ha), especially in Bükk and Mátra, but sporadically in Börzsöny, around Medves, in the Heves-Borsodi-dombság and on Aggteleki-karszt. Among the mountains of the Dunántúli-középhegység it can be found with larger amount only in Bakony (approx. 50 ha), while it is sporadic at other places (Pilis, Visegrádi-hegység) or has uncertain occurrence (Vértes, Keszthelyi-hegység). There are a few stands in Mecsek (60 ha). A variant of the habitat developed in the steep loess valleys can be found in Zalai-dombság and in Őrség. Separation from other habitats of rocky soils [LY2, LY3] can be occasionally uncertain.
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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