Natural regeneration of Scots pine in private forestry -shelterwoods' economy and the theoretical number of plants after cleaning

aclareo arbre forestier desbroce economic analysis espacement espaciamiento forest trees natural regeneration petite entreprise peuplement semencier pinus sylvestris private ownership production costs profitability propiedad privada rentabilidad rodal semillero seed stands silvicultura silviculture slashing small enterprises spacing suecia sweden sylviculture thinning