MB&G & ODF 1
Using FVS to Develop and TestStructure Based Management
Pam Overhulser, ODFMark Rasmussen, MB&G
2/14/07 FVS Conference
MB&G & ODF 2
Outline
• What is the planning problem?• How does FVS fit into the planning system?• How was FVS used?• Improvements
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ODF planning area
• 632,000 acres– High site– Fire history– Ownership history
• ODF structure– Seven districts– Foresters and managers,
long tenure in place
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ODF Forest Plan Summary
• Structure Based Management– accelerate growth of large diameter trees; – develop multi-storied canopy– produce commercial crops of timber – shifting mosaic of complex structure -- no set asides
• Habitat Conservation Plan• Targets/Outputs
– 50% complex structure target– Maximize even-flow timber volume
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Complex planning questions
• Strategic– Structure v. revenue v. set asides– Agree to HCP?
• Tactical– What to do about SNC?– SBM silvicultural methods– Set harvest levels
• Operational– Adjacency constraints– Road systems– Owl clusters– Location of complex forests
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Analytical process
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H&H Model
Grow Stands Schedule harvest units Operationally feasible solution
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Planning project stats
• Districts/models: 7• Acres: 632,070 • Stands: 6,673 • Harvest units: 14,306 • Polygons: 313,283 • Yield tables: 79,600• Coefficients: 108,564,472
• Budget: $2 million • Time: 36 months
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Why FVS?
• Evaluated 4 mature stand models,
and 3 young stand models – Data source– Support and documentation – Silviculture– Model behavior– Flexibility
• Growth models evaluated four times – south coast, northwestern districts, western cascades, southern Oregon
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Using FVS
1. Calibrate FVS
2. Choose taper system, merch specs
3. Define structure classes
4. Develop SBM cutting algorithms
5. Develop SBM regimes
6. Build, evaluate, report yields
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Using FVS: Calibrate FVSFG & AT: Sales & SLI v. FVS projections
0
20
40
60
80
100
120
0 20 40 60 80 100 120 140 160
Age
Mb
f/ac
re
FG sales
AT sales
TL 544 -354
Cas 398 262
FG 480 243
FG SLI
AT SLI
TL SLI
TPA:Total - >4"
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Using FVS: Volume calculations
1. PN, WC. SORNEC
2. Flewelling taper equations
3. Track volume and value by species by product/size/grade
4. Merch specsDistrict Astoria ElliottLog Length 40’ 32’Minimum Top DIB 5” 5” Trim Allowance 12” 12” Stump Height 1’ 1’ Minimum Log Length 12’ 12’Minimum DBH 8” 8”Defect by age
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Using FVS: Define structure classes
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Using FVS: Develop thinning specs• ODF financing, Auto Mark thinning contracts, 10 years of sales
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Using FVS: Define a set of regimes
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Using FVS: Make and evaluate yields
• YTG Tools
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Planning resultsharvest volume
0
50
100
150
200
250
300
350
400
450
1 6 11 16 21 26
time ( 5-year periods )
annu
al h
arve
st (
mm
bf)
fmp ~ hcp
fmp ~ ta
wood emphasis
reserve-based
complex structure percentage
0%
10%
20%
30%
40%
50%
60%
70%
1 6 11 16 21 26
time ( 5 year periods )
% c
ompl
ex
fmp ~ hcp
fmp ~ ta
wood emphasis
reserve-based
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Improvements for next time
• FVS– Thinning: clumpy v. uniform – Growth: genetic gain– Silviculture: Young stand and small tree growth
• ODF– Decay Model: Track snag and down wood components– Reprod
• SBM– Structure definition: thresholds v. similarity coefficient
• Inventory– Yield projections: stand v. strata