Vegetation of Külső-Somogy in Hungary III Regional diversity and pattern of abandoned fields and plant invasion

Salamon-Albert, Éva and Horváth, Ferenc (2009) Vegetation of Külső-Somogy in Hungary III Regional diversity and pattern of abandoned fields and plant invasion. NATURA SOMOGYIENSIS (15). pp. 41-52. ISSN 1587-1908 (print); 2062-9990 (online)

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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.

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