Plant biodiversity and land use in subalpine grasslands. A conservation biological approach

abattage d'arbres agriculture de montagne agroecosistemas agroecosystems alpine grasslands biodiversidad biodiversity botanical composition climax communities composition botanique conduite des herbages conservation de la nature corta endangered species farmland felling fenaison grassland management grazing haymaking highlands land use manejo de praderas marginal land mountain farming nature conservation noruega norway pastizales pastoreo pastures praderas alpinas prairie alpine summer technologie traditionnelle tecnologia tradicional terre agricole terre marginale tierras marginales traditional technology utilisation des terres verano