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Title : Why Aren't Trees Black?
link : Why Aren't Trees Black?

Why Aren't Trees Black?

If trees were more efficient solar collectors, the leaves would be black instead of green. They'd look more like solar cells, which are black so that they can absorb as much light energy as possible.

James Gurney, River Suir, Ireland, Oil, 8 x 10 inches

The green color that we see is "leftover" light, a wavelength that the tree's solar engine is not able to process.

This so-called "green gap" is caused by the fact that chlorophyll does well harvesting blue and red light. But because of a deficiency in the organic chemistry, leaves are not as good at capturing light in the green range.

Then why is some foliage red? The dark, red color serves as a sunscreen for young, delicate leaf tissue as it develops, so that it doesn't burn in the early spring sun. 

Normally that red color of early spring foliage gives way to green.



The copper beech—or Blutbuche (blood beech in German)—keeps its red color all year round because a metabolic disorder interferes with the normal action of enzymes to break down the reddish color. This type of tree probably would have died out, were it not for the intervention of human gardeners, who love the way red foliage looks in gardens.
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These factoids come from the book The Hidden Life of Trees
Scientific paper on ScienceDirect
Discussion on Biology website

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