29 5.7 Summary Questions

1. Assign a crown class to each of the following trees.

Seven trees. Tree 1 tall with large crown. Tree 2 below general layer of crown with narroe crown. Tree 3 tall but short crown. Tree 4 like tree 2. Tree five like tree 1. Tree 6 like tree2 but narrower crown. Tree 7 like tree 6 but longer crown

Seven trees. Tree one tall conifer with large crown. Tree 2 shorter conifer with narrow crown. Tree 3 tall and broad hardwood. Tree four short conifer with crown below general layer. Tree five like tree 1 but a bit shorter. Tree 6 broadleaf, but in middle of crown layer. Tree 7 like tree 5.

 

 

2. Where on this tree should the live crown be measured?

illustration showing a tree with branch whorls, with lowest branches heavier on one side of the tree

 

3.  Determine LCR for each tree illustrated.

Tech is 100 ft horizontal distance from tree. Measuresments are -34% to stump, +70% to top and -10% to base of crown

Tech is 100 ft. horizontal distance from tree. Measuresments are -34% to stump, +70% to top and +22% to base of crown

Tech is 100 ft horizontal distance from tree. Measuresments are -34% to stump, +70% to top and -1% to base of crown

 

 

Answers to Summary Questions

1. Trees on the ends of the illustrations are hard to determine, given that it is not known what is on the other side of them. Assume there are trees beyond what is shown, so use crown size as a partial indicator of the amount of light they are receiving.  Position in the crown is key.  The following are what I would assign, but I think the starred one (*) is borderline, and could be assigned the next higher crown class.

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2. The lower crown has branches only on one side.  So the base of the crown would be measured at a point approximately halfway between these branches.

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3. [latex]\text{Live Crown Ratio=}\left( {\frac{{\text{Length of crown}}}{{\text{Total tree height}}}} \right)\left( {100} \right)[/latex]

In these examples, total tree height is the same for each tree. At a horizontal distance of 100 feet, tree height is simply the two percent slope measurements added together.  70+34 = 104 feet.

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Tree a: [latex]\text{Live Crown Ratio=}\left( {\frac{{\text{70+10}}}{{\text{70+34}}}} \right)\left( {100} \right)[/latex] ≈ 77%

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Tree b: [latex]\text{Live Crown Ratio=}\left( {\frac{{\text{70-22}}}{{\text{104}}}} \right)\left( {100} \right)[/latex] ≈46%

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Tree c:  [latex]\text{Live Crown Ratio=}\left( {\frac{{\text{70+1}}}{{\text{104}}}} \right)\left( {100} \right)[/latex] ≈68%

 

 

 

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Forest Measurements: An Applied Approach Copyright © 2016 by Joan DeYoung is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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