36.2 - Alpine weathered rock and outcrop communities

Classification des habitats du Paléarctique (2001)

Description

Stonecrop and houseleak pioneer communities colonizing small surfaces on shallow soils of mostly siliceous rocky outcrops in the subalpine, alpine or montane levels of higher mountains of sub-Atlantic to Atlantic climates, in particular, of the Alps, the Pyrenees, the Cantabrians and associated northwestern Iberian ranges, the Black Forest and the Slovakian Carpathians. The communities are dominated by succulent Sempervivum arachnoideum ssp. arachnoideum, Sempervivum arachnoideum ssp. tomentosum, Sempervivum montanum ssp. montanum, Sempervivum montanum ssp. stiriacum, Sempervivum wulfenii, Jovibarba arenaria, Sedum montanum, Sedum anglicum ssp. pyrenaicum, Sedum sexangulare, Sedum album, Sedum annuum, Saxifraga aspera, accompanied by Silene rupestris, Scleranthus polycarpos, Veronica fruticans, Thymus praecox ssp. polytrichus, Viola tricolor ssp. saxatilis, by small crucifers, lichens and mosses.

Correspondances phytosociologiques

Sedo-Scleranthetalia: Sedo-Scleranthion biennis: Sclerantho-Sempervivetum arachnoidae, Violo saxatilis-Saxifragetum asperae, Sedetum montanae (Sedetum brigantiacum), Sileno rupestris-Sedetum annui, Sedo annui-Festucetum supinae; Sedion pyrenaici: Agrostio durieui-Sedetum pyrenaici, Sedetum micrantho-pyrenaici

Bibliographie

Devillers P., Devillers-Terschuren J. & Vander Linden C., 2001. PHYSIS Palaearctic Habitat Classification Database. Updated to 10 December 2001. Institut Royal des Sciences Naturelles, Bruxelles. (Source)

Braun-Blanquet, 1955a; Rivas-Martinez & al., 1984b; Dupias, 1985; Ellenberg, 1988: 484; Oberdorfer, 1990, 1993a, 1994; Pott, 1992; Mucina and Kolbek, 1993b.