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Re: Crown density

Subject: Re: Crown density
From: simonpryce
Date: Dec 15 2003 16:16:29
There's something about it in FC Field Book 12 by J L Innes, Assessment of
Tree Condition, 1990.  They use 5% classes based on fixed photographic
standards.  They aren't very clear on how they set the standards although it
appears to be based on measurement of the amount of light passing through
the crown.  Densest trees get 0%, worst [dead] ones 100%.  What the book
says is:

"The scores represent the amount of light passing through the crown and a
high score does not necessarily mean that a tree has lost foliage.  Rather
it indicates that it does not have as much foliage as a completely dense
tree"

That seems not to say anything at all, but I think what they're getting at
is that the most vigorous trees may well have longer bare shoots between the
leaves and appear less dense than slower growing examples of the same
species, so density should not be related too closely to health.  In
commercial forestry the former type of tree is most desirable as it will
probably also be growing a long straight trunk but in many arboricultural
situations a slower growing, bushier example might be more desirable.

Simon


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