Ábrahám Levente (szerk.): Válogatott tanulmányok IV. - Natura Somogyiensis 15. / Miscellanea 4. (Kaposvár, 2009)

Salamon-Albert Éva - Horváth Ferenc: Külső-Somogy vegetációja III. Parlagok és inváziós növények diverzitása és tájmintázata

Salamon-Albert E. & Horváth F.: Vegetation of Külsö-Somogy

43

Fig. 1: Territory, settlements, geographical and hydrological elements of Külső-Somogy

habitat types in Hungary 2) to create maps of semi-natural vegetation patches and 3) to evaluate landscapes with vegetation types and their attributes as well, 4) to evaluate territorial extension and spatial distribution of the abandoned fields that could be the basis of grassland regeneration. The database is constructed on a hexagon grid system of 35 hectars covering the whole area of the country as the primary mapping units (Horváth et al 2008). Approximately 100 hexagons are associated into a quadrat at landscape scale as a secondary mapping unit. In hexagons main existing habitat types, their roughly estimated areas and several vegetation attributes are listed (e.g. naturalness, neighbourhood, land use). This multi-attributed database is suitable to determine natural-based habitat quality, to estimate the relations of the wastelands in the Hungarian landscape and to compose the prognosis of future changes for vegetation and landscape. For more details see Horváth and Polgár (2008).

On the basis of MÉTA method a basic statistical analysis and evaluation was carried out on one hand, spatial thematic map were constructed for displaying the territory and extension of abandoned and invaded fields. Relative areal proportion (ha) of abandoned fields and alien species were calculated for quadrats and compared with each other connected to semi-natural habitats. Data were displayed in tables and on GIS thematic maps with appropriate additional layers (e.g. settlements, hydrological and geographical elements) using ESRI Arc View 3.3 software from valid hexagons of 95 quadrats. Habitat nomenclature is by Molnár et al (2008), species names are by Simon (2000).

In Külső-Somogy region 48 semi-natural habitat types of woodlands and grasslands were detected and analysed previously (Salamon-Albert and Horváth 2008a, 2008b). In this analysis, they were aggregated into wider categories as habitat groups (abbreviations of categories are listed in brackets, meaning of them see Molnár et al 2008): euhydrophyte habitats (AI, A23, A3a); marshes (Bla, B2, B3, B4, B5, B6, BA); flushes and transition mires (Cl); rich fens, eu and mesotrophic meadows and tall herb communities (D2, D34, D5, D6); colline and montane hay meadows (El, E2); dry and semidry closed grasslands (H4, H5a, H5b); riverine shrublands and woodlands (J2, J5, J6);