[Vegetation and grazing in Sortland municipality. Report from vegetation mapping]

botanical composition bovin browse plants cattle coasts cold zones composition botanique costa encuestas ganado bovino grasslands grazing herbage land use marginal land noruega norway nutritive value ovin ovinos pastoreo plantas de ramoneo plante d'abroutissement praderas sheep surveys terre marginale tierras marginales utilisation des terres valeur nutritive valor nutritivo vegetation zona fria zone froide