Green alder woods

Settled above the altimetric strip occupied by the wood or interspersed with it at its upper limit of expansion, extend the alneti, the shrubby populations of green alder, which, especially on the cool and shady slopes, leave little room for other species woody. It is a nitrogen-fixing species which, thanks to the symbiosis with particular microorganisms, manages to capture the nitrogen present in the atmosphere both for its own survival and for the enrichment of the soil.