R1-2 - Végétations dominées par des cryptogames et des annuelles sur les affleurements de roches siliceuses

Cryptogam- and annual-dominated vegetation on siliceous rock outcrops

Classification des habitats EUNIS 2022

Descriptif de l'habitat

Open pioneer grassland dominated by perennial succulents and annuals, with subordinate small tussock grasses, sometimes geophytes and often a prominent contingent of cryptogams. Typically forming small stands on very shallow and skeletal, impoverished, acid soils on siliceous rock outcrops, eroded slopes and disturbed or artificial habitats like soil heaps and wall tops, the habitat occurs throughout temperate and boreal Europe up to the subalpine belt, in situations where the permeable soils dry quickly in summer, but where spring rains can permit a quick flush of growth by the annuals.

Espèces diagnostiques

Scleranthus perennis, Gagea bohemica, Sedum album, Draba verna aggr., Sedum rupestre, Myosotis stricta, Veronica verna, Trifolium arvense

Espèces constantes

Sedum album, Poa bulbosa, Scleranthus perennis, Draba verna aggr., Trifolium arvense, Rumex acetosella, Sedum rupestre, Arenaria serpyllifolia, Sedum acre, Potentilla argentea, Veronica arvensis, Veronica verna, Potentilla tabernaemontani, Plantago lanceolata, Ceratodon purpureus, Erodium cicutarium, Cerastium pumilum, Myosotis stricta, Aira caryophyllea, Sanguisorba minor aggr.

Espèces dominantes

Sedum album, Poa bulbosa

Bibliographie

 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)