Crown closure is a term used in forestry. Crown closure and crown cover are two slightly different measures of the forest canopy and that determine the amount of light able to penetrate to the forest floor. Crown closure, also known as canopy closure, is an integrated measure of the canopy `over a segment of the sky hemisphere above one point on.....
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http://en.wikipedia.org/wiki/Crown_closure
The time in a forest's life when all the ground surface is covered with leaf area.
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http://www.encyclo.co.uk/visitor-contributions.php
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