VIEWS: 6 PAGES: 23 POSTED ON: 6/17/2011
Anecdotal Mensuration or The Persistence of Mensurational Myths by David Anderson Olympic Resource Management Overview • Set the stage • Introduce the characters • Lights, Camera, Action • Grand Finale • Credits Who is ORM • Pope and Talbot 1850 • Pope Resources 1985 • Olympic Resource Management 1997 • Fee Timber 112,000 Acres • Timberland Management • Consulting 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. 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. Where is ORM and Dewatto Lets See Some Trees Cast of Characters • Mining Timber Inventory • Felled stem analysis • Locate original reference for growth impact Data Mining • 1999 Inventory Project • New aerial photos and stand typing • Cruise all stands >= 45 years of age • Measure site trees Total Height vs Total Age from Inventory 140.00 120.00 100.00 Total Height King 70 Total Height 80.00 60.00 40.00 20.00 0.00 0 10 20 30 40 50 60 70 80 90 100 Total Age 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 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. 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 Felled Stem Plot Card Pope Resources: Total Height vs Total Age for Dewatto Felled Stem Analysis 140 1 120 2 3 4 100 5 6 80 7 Height 8 9 60 10 11 12 40 21 22 20 23 King Site 100 0 0 10 20 30 40 50 60 70 80 Total Age 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. 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. DNR Anecdote DNR Felled Stem Study 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. 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.
Pages to are hidden for
"Dewatto Hardpan"Please download to view full document