imperfect metabolism

Ministere des Ressources naturelles mrn05 at
Mon Mar 3 13:48:09 EST 1997

My question is : Why red oak and young american beech keep theirs leaves 
in the winter ( I live near Montreal at the north of the U.S. )Somebody 
told me it's because oak and beech have an imperfect metabolism at the 
         Any response would be greatly appreciated and if you have 
reference book too.

                                 Florent Lemieux
                                 Technicien forestier

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