Effects of simulated summer browsing by moose on leaf and shoot biomass of birch, Betula pendula [Alces alces]

alce alimentation des animaux altura animal feeding arbre betula pendula biomasa biomass biomasse browsing crecimiento croissance defoliation elks estado juvenil de las plantas growth hauteur height herbivore herbivores juvenility of plants plant response ramoneo respuesta de la planta seasonal variation summer trees verano