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TOPIC: Monarch Pine in Ice Glen
http://groups.google.com/group/entstrees/browse_thread/thread/da9fd747573172cf?hl=en
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== 1 of 1 ==
Date: Wed, Aug 20 2008 3:51 pm
From: dbhguru@comcast.net
ENTS,
Today I went to Ice Glen in Stockbridge, MA to model the Monarch
Pine - the other very large white pine growing in the Glen. The
Monarch is considerably smaller than the famous Ice Glen Pine, but
nonetheless, a whopper. However, I had a challenge on my hands. The
mosquitos were vicious. They lapped up the insect repellant that I
bought in the Michigan UP. The stuff evidently doesn't work on
Massachusetts mosquitoes. I was going to do a lot of work, but
stopped at what you see below after surrendering about a pint of
blood to the little !@#$%^&*()$s.
| Modeling
of Monarch Pine - Ice Glen, Stockbridge, MA |
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(1) |
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(2) |
(3) |
(4) |
(5) |
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| CBH |
Hgt |
Factor |
Vol
of frustum |
Cum
Vol |
|
Cal
@ 14.2 |
Cal
@ 12.2 |
Avg
(2) & (3) |
DBH
Cal x 0.41 Factor |
%
Cylinder Vol based on (1) |
| 15.00 |
0.00 |
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| 14.20 |
1.00 |
0.333 |
16.95 |
16.95 |
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| 12.20 |
4.50 |
0.333 |
48.57 |
65.52 |
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| 11.90 |
6.00 |
0.333 |
17.32 |
82.84 |
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| 8.83 |
40.00 |
0.333 |
292.45 |
375.29 |
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| 8.61 |
50.50 |
0.333 |
63.44 |
438.73 |
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| 8.48 |
55.50 |
0.333 |
29.02 |
467.76 |
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| 5.87 |
100.00 |
0.333 |
184.30 |
652.06 |
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| 0.30 |
144.20 |
0.333 |
42.59 |
694.66 |
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| Tot
Volume |
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694.66 |
|
770.51 |
568.75 |
669.63 |
700.2 |
41% |
The modeled volume using the Macroscope 25 is 695 cubic feet. For
comparison purposes, the conical volume computed by using a basal
area as that just above the root flare (14.2 feet CBH) is 771 cubes.
Using a conical volume with the basal area taken at 4.5 feet ( 12.2
feet CBH) is 569 cubes. The average of the two is 670 cubes, which
is relatively close to the full modeled volume. However, the volume
using the basal area at 4.5 feet and a factor of 0.41 instead of
0.333 gives 683 cubes. A chose a 0.41 factor as roughly midway
between a cone and paraboloid. For other mature pines that I've
modeled, I'm going to test further use of this factor on large pines
in the and advanced and intermediate age classes. However, it
appears that really old pines like the Ice Glen Pine need a higher
factor - as high as 0.45 or higher. In the case of the Ice Glen
Pine, 0.46 leads to a volume of 938 cubes, which is fairly close to
the modeling numbers we get when many measurements are taken. How
ever, 0.43 works very well with the Grandfather Pine in MSF, giving
961 cubes versus the full modeling value computed by Will of 967.2
cubes.
It looks like a factor in the range of 0.40 to maybe 0.47 based
on overall form could yield excellent results. The choice of the
exact factor may be made possible by another measurement. We'll see.
Bob
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