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
48 Natura Somogyiensis Dry open Quercus woodlands Rocky woodlands Dry closed Quercus woodlands Mesic deciduous woodlands oflowlands Mesic deciduous woodlands of hills and mountains Riverine shrublands and woodlands Dry and semi-dry closed grasslands Colline and montane hay meadows Eu- and mesotrophic wet meadows Marshes Euhydrophyte habitats 0 20 40 60 80 100 Threatened by invasive species (%) Fig. 2: Area of habitat groups threatened by alian plant invasion in percentage in Külső- Somogy. For habitat aggregation see Table 1 and Botta-Dukát (2008). Number of cases less than 5 and missing habitat groups are excluded. 3). This map emphasizes spatial variation of two series of target attributes: cover and areal distribution of abandoned fields and sum of habitats threatened by alien plant species. In the first step territorial extension of them were added by a previously standardized consensus scale (<2 ha, 2-15 ha, 15-200 ha, 200-500 ha, >500 ha). Data analyses were based on valid hexagons, spatial covering maps were displayed at quadrat level referred to the MÉTA SQL database. Spatial distribution and summarized covering of abandoned fields and alien species are displayed and compared to each other and to main associated habitat groups and types of woodlands and grasslands. We can compare territorial distribution of abandoned fields and invasive species to semi-natural habitat types (see Fig. 3 and Salamon-Albert and Horváth 2008a, 2008b). Selected vegetation groups are significant to abandoned fields and/or set of alien species: dry and semi-dry grasslands (especially E habitats) to abandoned fields; mesic deciduous woodlands (especially K2), dry and rocky woodlands (especially L2a) and bush vegetation (especially P2a and P2b) to the centres of plant invasion. According to occurrence and frequency of alien species pool, stands of mesic K2 and dry L2a woodlands could be planted and originated from one-time grassland habitats. Overlapping with P2a and P2b bush habitats makes one-time clear-cuttings probable.
