U2-2 - Éboulis siliceux des hautes montagnes tempérées

Temperate high-mountain siliceous scree

Classification des habitats EUNIS 2022

Descriptif de l'habitat

Siliceous, mostly acidic screes, moraines or stone rivers found at high altitudes and cool sites in mountain ranges through the nemoral zone of Europe. The screes are colonized by a range of mostly perennial, mostly acidophilous plants. Their composition is strongly influenced by altitude and regional climate. There are many relict and local endemic species, though less than on calcareous screes. Often the vegetation cover is sparse, but these screes can be more humid because of the impervious and water-retentive character of the substrates and long snow-lie encourage luxuriant growth and accumulation of humus.

Espèces diagnostiques

Saxifraga bryoides, Poa laxa, Ranunculus glacialis, Veronica telephiifolia, Oxyria digyna, Leucanthemopsis alpina, Cardamine resedifolia, Androsace alpina, Murbeckiella pinnatifida, Geum reptans, Saxifraga seguieri, Sedum alpestre, Saxifraga sibirica, Cerastium uniflorum

Espèces constantes

Oxyria digyna, Saxifraga bryoides, Poa alpina, Ranunculus glacialis, Leucanthemopsis alpina, Poa laxa, Cardamine resedifolia, Sedum alpestre, Linaria alpina, Silene acaulis, Luzula alpinopilosa, Cryptogramma crispa

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)