R1-22 - Affleurements et rochers érodés à végétation clairsemée

Sparsely vegetated weathered rock and outcrop habitats

Classification des habitats EUNIS 2022

Descriptif de l'habitat

Rocks and outcrops colonised by pioneer communities, especially of Crassulaceae. Vegetation of the alliance Sedo-Scleranthion biennis. Substrates are mostly siliceous, occurring in the upland and montane levels of the nemoral zone. The communities are dominated by succulent [Sempervivum], [Jovibarba] and [Sedum] species accompanied by Silene rupestris, Erophila verna, Scleranthus polycarpos, Veronica fruticans, Thymus praecox ssp. polytrichus, Viola tricolor ssp. saxatilis, by small crucifers, lichens and mosses Polytrichum piliferum and Racomitrium canescens.

Bibliography

 European Topic Centre on Biological Diversity, 2021. EUNIS terrestrial habitat classification 2021 including crosswalks. ETC/BD-EEA. Table Excel transmise par S. Hennekens (Alterra) le 14/02/2022. (Source)