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Biotope - Typologie Européenne EUNIS
D2.3H - Niveau 4 : Communautés des tourbes et des sables humides, ouverts et acides, avec Rhynchospora alba et Drosera
Description
Sparse, bryophyte-poor, sedge and rush communities of bare, extremely wet peat muds of boreal mires, frequently inundated, remaining wet for a prolonged part of dry periods, together with pioneer communities of humid exposed peat or, sometimes, sand, forming on stripped areas of blanket bogs or raised bogs, as well as on naturally seep- or frost-eroded areas of wet heaths and bogs, in flushes and in the fluctuation zone of oligotrophic pools with sandy, slightly peaty substratum. Vegetation of alliance Rhynchosporion albae, the most typical species are Rhynchospora alba, Hydrocotyle vulgaris, Juncus bulbosus, Lycopodiella inundata, Sphagnum subsecundum, Sphagnum denticulatum and Sphagnum inundatum.
Taxons (Liens actifs si espèces présentes)
Hydrocotyle vulgaris L., 1753, Juncus bulbosus L., 1753, Lycopodiella inundata (L.) Holub, 1964, Rhynchospora alba (L.) Vahl, 1805, Sphagnum denticulatum Brid., 1826, Sphagnum inundatum Russow, 1894, Sphagnum subsecundum Nees, 1819,
D2.3H1 - Niveau 5 : Communautés des tourbes nues de la zone némorale
Description
Highly constant pioneer communities of humid exposed peat or, sometimes, sand, of nemoral Atlantic and sub-Atlantic regions of the Palaearctic domaine, with Rhynchospora alba, Rhynchospora fusca, Drosera intermedia, Drosera rotundifolia, Lycopodiella inundata, forming on stripped areas of blanket bogs or raised bogs, but also on naturally seep- or frost-eroded areas of wet heaths and bogs, in flushes and in the fluctuation zone of oligotrophic pools with sandy, slightly peaty substratum. These communities are similar, and closely related, to those of shallow bog hollows (unit D1.1122) and of transition mires (unit D2.37). They are often associated with wet heaths of unit F4.1 or Myrica gale scrubs of unit D4.1M.
Taxons (Liens actifs si espèces présentes)
Drosera intermedia Hayne, 1798 ( Esp. caract. )
Drosera rotundifolia L., 1753 ( Esp. caract. )
Lycopodiella inundata (L.) Holub, 1964 ( Esp. caract. )
Myrica gale L., 1753 ( Esp. caract. )
Rhynchospora alba (L.) Vahl, 1805 ( Esp. caract. )
Rhynchospora fusca (L.) W.T.Aiton, 1810 ( Esp. caract. )
Drosera rotundifolia L., 1753 ( Esp. caract. )
Lycopodiella inundata (L.) Holub, 1964 ( Esp. caract. )
Myrica gale L., 1753 ( Esp. caract. )
Rhynchospora alba (L.) Vahl, 1805 ( Esp. caract. )
Rhynchospora fusca (L.) W.T.Aiton, 1810 ( Esp. caract. )
Analyse Ecologie du milieu (En fonction des espèces présentes)
Faible
Forte
— nb espèces indicatrices par classe
Humidité
Réaction du sol (pH)
Nutriments
Lumière
Matière organique
Granulométrie
Salinité