J5 – Riverine ash-alder woodlands:
Mesic-hygrophilous forests, developed in stream valleys and basins of submontane and colline regions. Alnus glutinosa is usually the dominant species of the tree layer (if not, it is almost always present). The shrub and the herb layers contain mesic deciduous forest and riverine forest elements alike, and the geophyte vegetation is often well-developed. The minimal width of the habitat should be two tree lines on both part of the stream. Thinner belts belong to this habitat only if the herb layer significantly differs from the surroundings, presumably mesic forest, or the line of alders remained in a deforested landscape. The total area of the habitat is 16000 ha in Hungary. Its real homeland is the hilly region of the south-western part of Dunántúl; its area is more than 8500 ha on Dél-Dunántúl, and more than 4500 ha on Nyugat-Dunántúl. In the submontane areas it usually forms only thin belts along the streams. It can be found in all parts of the Északi-középhegység (1700 ha), moreover it occurs in the Gödöllői-dombvidék, more sporadically in the Dunántúli-középhegység (1000 ha), and it is more frequent just in Bakony (but missing in Velencei-hegység and Budai-hegység). Riverine ash-alder woodland is a typical habitat of the floodplains of colline-submontane streams, connected mainly to the high groundwater, but the occurrences correspond also with the amount of precipitation. Hence, it occurs only on the edges of Alföld and Kisalföld (50 and 140 ha), and is missing in their dry inner parts.
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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