41.B3 - Niveau 4 : Bois de Bouleaux montagnards et subalpins
Description
Birch stands of the montane and sub-alpine levels of the Alps, the Apennines, the Pyrenees, the Jura and the Hercynian ranges, mostly sub-climax formations of stations with anomalous edaphic and microclimatic conditions.
Taxons (Liens actifs si espèces présentes)
41.B32 - Niveau 5 : Massifs forestiers de Bouleaux
Description
Birch stands, mostly of Betula pubescens (B. carpatica, B. tortuosa), occupying, in the Alps, the Jura and the Hercynian ranges, cold stations on cliff-base rocky screes and boulder-falls through which cold air flows.