Cattle - horse and sheep-grazing at light stocking-rates for the conservation of subalpine pastures encroached by shrubs [Piedmont]

alpine grasslands arbuste arbusti arbustos bovin bovini caballos calluna vulgaris carga ganadera cattle cavalli cheval ganado bovino grazing highlands horses juniperus malezas mauvaise herbe ovin ovini ovinos pascolamento pascoli alpini pastoreo piamonte piante infestanti piedmont piemont piemonte plant population popolazione vegetale praderas alpinas prairie alpine rhododendron sheep shrubs stocking density taux de charge vaccinium myrtillus weeds