Tree growth rings

Numéro d’image : 11536339
Tree growth rings
Tree growth rings. Close-up of the rings of a silver fir tree (Abies alba),which were exposed by cutting across a tree trunk or branch. Each tree ring represents a period of growth in which the tree formed new wood. Each year the outer part of a tree trunk,the living part,lays down a new layer. The older layer dries out and dies,forming the hard mass of wood in the core of a trunk,the heart wood. Each ring corresponds to a single year and allows the age of the tree to be calculated. A ring varies in width according to the climate that year. Photographed at the Centre of Alpine Ecology,Trento,Italy
Licence : Droits gérés
Crédit: Science Photo Library / Fermariello, Mauro
Taille de l’image : 3780 px × 4644 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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