L2a - Quercus petraea – Quercus cerris woodlands:
50% of its area is endangered by plant invasion, but there is a high spatial variation in the cover of alien species. The most important alien species is the black locust (Robinia pseudoacacia), and tree of heaven (Ailanthus altissima) reaches considerable cover.
Botta-Dukát Z. (2008): Invasion of alien species to Hungarian (semi-)natural habitats Acta Botanica Hungarica 50(Suppl.): 219-227. >>> letöltés (139 KB, PDF)