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
50 Natura Somogyiensis Fig. 3: Territorial proportion of abandoned fields and plant invasion in Külső-Somogy region Discussion In our study we have discussed the areal proportion and distribution patterns of abandoned fields and plant invasion by threatened habitats and diversity of alien species at landscape scale. Analysing regional extension data, there are some definite conclusion that is characteristic for Külső-Somogy. Threatened habitats occur among grasslands and woodlands as well, both in wet, mesic and dry habitat types and groups. There was an evidence in case of riverine woodlands and marshes with high proportion of threatenings. Some striking was revealed in case of dry open Quercus woodlands and rocky woodlands with hard threatening also in contrast with their high potenciál resistance. Comparing regional data to national scale according to corresponding habitat types and groups, average threatening of patches are greater in Külső-Somogy. Threatened habitats of marshes, dry and semi-dry closed grasslands and dry open or closed and rocky woodlands have more than twice proportion in the region than in Hungary overall. Land use practice or threatening state of habitat types can be likely interpereted by spatial overlapping with plant invasion or location of abandoned fields. Generally occuring invasive species are Ailanthus altissima, Solidago spp., Robinia pseudo-acacia and besides them some unnamed species that need to be validated. Invasive species that are specific for habitat groups are Acer negundo, Echinocystis lobata, Elaeagnus angustifolia and Phytolacca americana. Prunus serotina is sporadic, Reynoutria spp. are fully absent in Külső-Somogy region, their data might be underestimated or deficient in the landscape. Among most important invasive species, 4 ones occur with greater frequency than at national scale (Acer negundo, Ailanthus altissima, Solidago spp., Robinia-pseudo-acacia), two species have less threatening potential, Amorpha fruticosa and Fraxinus pennsylvanica.
