Saxifraga depressa grows only on the summits of eleven siliceous massives in the western Dolomites. It is restricted to the habitat of steep N-faced screes lying above 2000 m. Syntaxonomically, Saxifraga depressa characterizes the association Saxifragetum depressae which is here described for the first time with two subassociations. With respect to the closely allied Oxyrietum digynae, the Saxifragetum depressae colonizes debris richer in fine material. The soil pH in the habitats of the Saxifragetum depressae varies from acid to slightly basic, mainly as a result of lithological differences in the parent rocks. The habitats having a subneutral or basic soil are colonized by a well-defined subassociation of the Saxifragetum depressae, which is differentiated by some basiphilous species. © 1992 Kluwer Academic Publishers.
Saxifraga depressa and Saxifragetum depressae: an endemic species and association of the western Dolomites (Italy) - Distribution, habitat and syntaxonomy
GERDOL, Renato
1992
Abstract
Saxifraga depressa grows only on the summits of eleven siliceous massives in the western Dolomites. It is restricted to the habitat of steep N-faced screes lying above 2000 m. Syntaxonomically, Saxifraga depressa characterizes the association Saxifragetum depressae which is here described for the first time with two subassociations. With respect to the closely allied Oxyrietum digynae, the Saxifragetum depressae colonizes debris richer in fine material. The soil pH in the habitats of the Saxifragetum depressae varies from acid to slightly basic, mainly as a result of lithological differences in the parent rocks. The habitats having a subneutral or basic soil are colonized by a well-defined subassociation of the Saxifragetum depressae, which is differentiated by some basiphilous species. © 1992 Kluwer Academic Publishers.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
