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
Natura Somogyiensis 15 41-52 Kaposvár, 2009 Vegetation of Külső-Somogy in Hungary III Regional diversity and pattern of abandoned fields and plant invasion Éva Salamon-Albert1 & Ferenc Horváth2 University of Pécs, Biological Institute, Department of Systematic and Ecological Botany H-7624 Pécs, Ifjúság útja 6., Hungary, e-mail: albert@gamma.ttk.pte.hu institute of Ecology and Botany of the Hungarian Academy of Sciences H-2163 Vácrátót, Alkotmány utca 4., Hungary, e-mail: horvfe@botanika.hu Salamon-Albert, É. & Horváth, F.: Vegetation of Külső-Somogy in Hungary 111. Regional diversity and pattern of abandoned fields and plant invasion. Abstract: A systematic overview and landscape pattern of abandoned fields and plant invasion according to semi-natural habitats in Külső-Somogy are summarized based on MÉTA method. Areal distribution of abandoned fields and plant invasion was mostly overlapping, centres were revealed from the North-Western and South-Eastern parts. Dry and semi-dry grasslands (e.g. E habitats) were significant to abandoned fields and/or set of alien species, mesic deciduous woodlands (e.g. K2), dry and rocky woodlands (e.g. L2a) and bush vegetation (e.g. P2a and P2b) to the centres of plant invasion. Cover of threatened habitat types, number and ratio of invasive species were analysed and compared to national results. Average threatening of real semi-natural habitats were greater in Külső-Somogy than similar ones at national scale. Hardly threatened habitat types were among woodlands in great proportion. Most invaded semi-natural habitats are riverine shrublands and woodlands, marshes, mesic deciduous woodlands in lowlands, dry open Quercus woodlands and rocky woodlands. Dry closed Quercus woodlands, colline and montane hay meadows and euhydrophyte habitats were the least invaded groups. Among alien species Robinia pseudo-acacia, Solidago spp., Ailanthus altissima and some other species were the most significant. Prunus serotina is sporadic, Reynoutria spp. is absent in the region. By the analyses a regional order of invasive species importance was created. It is clearly verifiable that plant invasion is a more serious problem than spreading of abandoned fields in Külső-Somogy region. Keywords: abandoned field, alien species, GIS database, MÉTA method, habitat patches, landscape ecology Introduction Külső-Somogy is a characteristic hilly landscape with several types of semi-natural woodlands and grasses in the middle of Transdanubia belonging to Kaposense and Somogyicum phytogeographical regions. This landscape is a poorly documented area in Transdanubia and in Hungary as well according to its natural vegetation. Last years some systematic overview were published about semi-natural habitat diversity and pattern of this region (e.g. Salamon-Albert and Horváth 2008a, 2008b). They were presented as the reference verifying and finding new occurrences of vegetation types and corresponding analyses of existing semi-natural habitats.
