Effects of the length of the snow-free period on leaf longevity in alpine shrubs: a cost-benefit model [Sieversia pentapetala, Phyllodoce aleutica, Rhododendron aureum]

adaptation alpine vegetation arbuste arbustos couche de neige crecimiento croissance cubierta de nieve feuille growth highlands hojas japan japon leaves light longevidad longevity luz modele modelos models rhododendron rosaceae shrubs snow cover temperatura temperature