Ábrahám Levente (szerk.): Válogatott tanulmányok IV. - Natura Somogyiensis 15. / Miscellanea 4. (Kaposvár, 2009)
Ortmanné Ajkai Andrienne - Horváth Ferenc: Külső-Somogytól a Mecsekig: DNX Magyarország három dombvidékének vegetációja
Ortmann-né Ajkai A. & Horváth E: From Külső-Somogy to Mecsek Hills 17 120 Fig. 2: Climatic gradients in the three regions studied (100%: Baranyai-hegyhát) According to the potential natural vegetation map of Hungary (Zólyomi 1989), Baranyai-hegyhát is situated marginally between zones of illyrian hornbeam-oak forests and turkey oak — sessile oak forests, Völgység is in the zone of turkey oak — sessile oak forests, and Tolnai-hegyhát is in zones of turkey oak - sessile oak forests and closed and mixed steppe oak forests. Original vegetation types - besides of these zonal communities - are: azonal alder woodlands, lowland oak-hornbeam woodlands (very rare), and small stands of euhydrophyte vegetation and marshes along watercourses, acidic oakhornbeam and beech forests on steep, hillsides with soils turning slightly acidic, some small rock and ravine woodlands (only in Baranyai-hegyhát, closest to Mecsek hills), and extrazonal beech forests. All three regions are intensively cultivated today, natural and semi-natural vegetation covers in Baranyai-hegyhát about 34%, in other two ones about 10%. Actual vegetation consists of remnants of former forests, secondary xeromesophilous grasslands in place of former forests, pastures with trees (only in Baranyaihegyhát), in valley bottoms mesotrophic and Arrhenatherum hay meadows, in place of former lowland alder groves secondary willow stands, and narrow, fragmented euhydrophyte and marsh belts of fishponds’ edges. Data collection and analysis Field data collection was executed between 2003-2006 as a grid-based, satellite-image supported (SPOT4), multi-attributed, large-scale mapping method called MÉTA (Molnár et al. 2007). It was directed and coordinated by compulsory use of Á-NÉR 2003 mapping and habitat guides (Molnár 2003, Bölöni et al. 2003). The goals were: 1) collecting data of all natural and semi-natural habitat types in Hungary 2) creating maps of natural and semi-natural vegetation patches and 3) evaluating landscapes with vegetation types and their attributes as well. The database is constructed on a hexagon grid system of 35 hectars covering the whole area of Hungary as mapping units. Approximately 100 hexagons are grouped into a quadrant at landscape scale. In hexa-
