The variety of colors of autumn trees are related to photosynthesis, ie the process by which the leaf chlorophyll transforms water and carbon dioxide into food. In summer, green plants produce large doses of chlorophyll. But when winter comes and the days get shorter the production of this green substance is reduced. And we began to see other pigments. Carotenoids, for example, necessary to capture sunlight give a yellow to intense sometimes leaves as gold. This anthocyanin only as scarlet oak trees or in some maples, generates tones ranging from red to purple.
The colors of this season are more intense when autumn days are sunny and the nights are cold, but not if the temperature drops below freezing.
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