Anecdotal Mensuration or The Persistence of Mensurational Myths by David Anderson Olympic Resource...
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![Page 1: Anecdotal Mensuration or The Persistence of Mensurational Myths by David Anderson Olympic Resource Management.](https://reader035.fdocuments.in/reader035/viewer/2022070401/56649f1e5503460f94c35d4f/html5/thumbnails/1.jpg)
Anecdotal Mensurationor
The Persistence of Mensurational Myths
by David Anderson
Olympic Resource Management
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Overview
• Set the stage
• Introduce the characters
• Lights, Camera, Action
• Grand Finale
• Credits
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Who is ORM
• Pope and Talbot 1850
• Pope Resources 1985
• Olympic Resource Management 1997• Fee Timber 112,000 Acres• Timberland Management• Consulting
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Anecdote
Those trees in Dewatto grow funny That a soil hardpan condition present in
the Dewatto block produces trees with stagnant height growth after age forty to fifty that is not explained by site index.
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Anecdote Implications
• That timber yields were less than would be expected in Dewatto
• That I was going to have to do extra work to model this hardpan effect.
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Where is ORM and Dewatto
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Lets See Some Trees
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Cast of Characters
• Mining Timber Inventory
• Felled stem analysis
• Locate original reference for growth impact
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Data Mining
• 1999 Inventory Project• New aerial photos and stand typing• Cruise all stands >= 45 years of age• Measure site trees
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Total Height vs Total Age from Inventory
0.00
20.00
40.00
60.00
80.00
100.00
120.00
140.00
0 10 20 30 40 50 60 70 80 90 100
Total Age
To
tal H
eig
ht
TotalHeightKing 70
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More Anecdotes
• Me to Head Forester: I’m going to Dewatto to do a felled stem analysis
• Head Forester: Well you know the hardpan isn’t everywhere, maybe only half of Dewatto
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Felled Stem Analysis
Had to be cheap, simple and accurate Measure trees on three plots
Two Plots in Hardpan Zone One Plot in non-Hardpan Zone
Plots coincidentally happened to be located in areas with active logging.
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Measurements Taken
Stump Age Stump Diameter Height to Crown Base Age at Crown Base Diameter at Crown Base Interwhorl Distances from crown base to
top of stem
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Felled Stem Plot Card
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Pope Resources:
Total Height vs Total Age for Dewatto Felled Stem Analysis
0
20
40
60
80
100
120
140
0 10 20 30 40 50 60 70 80
Total Age
He
igh
t
1
2
3
4
5
6
7
8
9
10
11
12
21
22
23
King Site 100
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Anecdote History• 1956 paper by Willard Carmean about
Puget Sound Trough Soils
• DNR used this paper to adjusted yields lower for lands in the area.
• Charles Chambers years later reviewed the paper and questioned some of the conclusions.
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Anecdote History
• DNR did a cooperative felled stem study with Simpson who had used earlier DNR results
• ORM’s CEO from September 2000 to December 2001 formerly was an executive with Simpson.
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DNR Anecdote
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DNR Felled Stem Study
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Grand Finale
• Data mining showed no hardpan
• Felled stem analysis showed no hardpan
• Historical version of anecdote had been disproved
• Dewatto Hardpan is a rural legend.
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Credits
Byron Hinners for assisting in felled stem analysis
Charles Chambers who told me the DNR story.
The hardpan anecdote for giving me a opportunity to measure some trees.