I’ve seen most of the trees (at least in Canada) change color in autumn to an orangey, I’ve heard it has to do with better absorption of sunlight waves that change during this time of the year.
But why they begin to change from top to bottom? I would think the inner ones or lowest ones would change first since they have less access to sunlight than the top ones.
In: 38
They absorb the chlorophyll into the cambium to store during winter. Also in the leaves are carotenoids. They reflect in the orange and red range, in lower amounts than chlorophyll. As the chlorophyll gets absorbed, leaf tissue turns from green to yellow to orange and finally red. In this case the upper leaves are absorbing the chlorophyll more than the lower leaves.
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