The presence of invasive alien plant species in different habitats: case study from Slovenia | Razširjenost tujerodnih invazivnih vrst rastlin v različnih habitatih: primer iz Slovenije

anglais. Invasive alien plants present a threat to diversity of native species. An attempt to evaluation of potential endangerment of specific habitats due to the presence of invasive alien plant species was made and results are presented in this paper. Data about the presence of invasive alien plants in specific habitats were extracted from the database Flora of Slovenia (at the Centre for Cartography of Fauna and Flora). The list of the most frequent invasive alien plant taxa in natural and semi-natural habitats is presented as well as the lists of invasive alien plants with potentially most negative influence on the biodiversity in different habitats. In general, taxa with potentially most negative influence on the biodiversity of natural habitats in Slovenia are: Robinia pseudacacia, Solidago gigantea, Fallopia japonica and F. × bohemica, Rudbeckia laciniata,Helianthus tuberosus. In the dataset the highest number of data about presence of invasive alien plants referred to riparian zones (44%). Thesecond highly infected group of habitats was floodplain woods. According to the Ellenberg indicator values the most of the invasive alien plants prefer nutrient-rich and sunny sites. The negative effect of Fallopia × bohemica on light conditions in established stands andconsequently on the species richness of native plants was also detected.

slovène. Invazivne tujerodne vrste rastlin ogrožajo pestrost domorodnih vrst. V članku so prikazani rezultati poskusa ovrednotenja potencialne ogroženosti posameznih habitatov zaradi prisotnosti invazivnih tujerodnih vrst rastlin. Podatki o prisotnosti invazivnih tujerodnih rastlin v posameznih habitatih, so pridobljeni iz podatkovne zbirke Flora Slovenije (na Centru za Kartografijo Favne in Flore). Predstavljen je seznam najbolj pogostih invazivnih tujerodnih vrst rastlin v naravnih in sonaravnih habitatih kot tudi seznam invazivnih tujerodnih vrst rastlin, ki imajo potencialno najbolj negativen učinek na biodiverziteto v različnih habitatih. Na splošno so taksoni s potencialno najbolj negativnim učinkom na biodiverziteto v naravnih habitatih Slovenije naslednji: Robinia pseudacacia, Solidago gigantea, Fallopia japonica in F. × bohemica, Rudbeckia laciniata ter Helianthus tuberosus. V podatkovni bazi se je največ tovrstnih podatkov nanašalo na obrežne pasove (44%). Druga najboljo kužena skupina habitatov so bili poplavni in močvirni gozdovi. Glede na Ellenbergove indikatorske vrednosti večini invazivnih tujerodnihvrst ustrezajo s hranili bogata sončna rastišča.   26                                                                           Acta Biologica Slovenica, 55 (2), 2012   Ugotovili smo tudi negativni učinek taksona Fallopia × bohemica na svetlobne raz- mere in posledično na vrstno pestrost v dobro razvitihsestojih omenjenega taksona.