Protective forests in the Aosta Valley

Protective forests in the Aosta Valley

What is a protective forest?

In the Aosta Valley, about 30% of the land is forested with multiple roles: productive, ecological, and—most importantly—protective against avalanches, rockfalls, mudflows, and erosion

Three protection levels are defined:

  • Level I: general protection against erosion and water regulation.
  • Level II: mitigation of rockfall, landslides, and avalanches on steep slopes.
  • Level III: direct protection where forests are located above villages, roads, or infrastructure

In the Aosta Valley, about 42.7% of the forest cover serves a direct protection function (Level III), amounting to over 40,500 hectares.

How forests act against natural hazards

  • Trees intercept snow, stabilizing the snowpack.
  • Roots bind the soil, reducing landslides.
  • Vegetation, slope variation, and natural corridors slow down rockfall and mudslides

A healthy, well-structured forest is therefore the most effective and economical natural means of ensuring alpine safety.

Species in protective woodlands

  • Larix and Swiss stone pine (Pinus cembra) represent 40.3% of direct-protection forests.
  • Spruce (Picea abies) and Scots pine forests each account for ~15%.
  • Broadleaf types like maple-ash stands (9.2%) and chestnut woods (6.5%) complete the picture.

“Adret” slopes host sun-loving species: Scots pine, sessile oak, birch, and larch. “Envers” slopes, shaded and colder, favour white fir, beech, spruce, stone pine, and lime.

History, regulation and management

The Royal Decree 3267/1923 established legal recognition of forests as vital buffers against natural hazards.

Today, over 91% of the region is zoned under soil and hydrogeological protection laws.

From 2000 onward, EU-supported Interreg and Alcotra projects helped map and manage direct‑protection forests sustainably.

A long view of the territory


Mountain forests are more than scenery. They are silent guardians, living structures that ensure safety, biodiversity, cultural identity, and traditional activities.

Protecting them means preserving the life of the valley.

References

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