Monarch Pine in Ice Glen

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TOPIC: Monarch Pine in Ice Glen
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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 (1) (2) (3) (4) (5) 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 14.20 1.00 0.333 16.95 16.95 12.20 4.50 0.333 48.57 65.52 11.90 6.00 0.333 17.32 82.84 8.83 40.00 0.333 292.45 375.29 8.61 50.50 0.333 63.44 438.73 8.48 55.50 0.333 29.02 467.76 5.87 100.00 0.333 184.30 652.06 0.30 144.20 0.333 42.59 694.66 Tot Volume 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