A study of the mountainside revegetation works in Hokkaido [Japan], 1: The actual conditions of revegetated slopes in southern and central Hokkaido

altiplanos artificial regeneration asia asie biological development conservation conservation des ressources conservation des sols crecimiento croissance fisiologia fonction physiologique growth japan japon manejo del suelo mise en valeur du sol physiographic features physiological functions physiologie physiology regeneration resource conservation silvicultura silviculture soil conservation soil management sylviculture vegetation