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Comparing Stand Age 140 Basal Area per Acre Outputs from the
DFC, FVS and ORGANON Models
• Steve McConnell• Forest Integrity• Spokane, WA
• Growth Model Users Group Meeting• December 9, 2011
• Portland, OR
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The DFC Model
• Used for managing riparian forests in Washington State.
• Predicts basal area growth based on site class, tree species and stand inventory data
• Provides harvest prescriptions based on management option, site class, stream size and projected stand age-140 basal area
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The DFC Model
• Derived from ORGANON
• In use for management purposes since 2001
• Never compared against other commonly used models
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Riparian Management Zones
• Management Focused on Inner Zone
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Provides Two Management Options
1.Thin from below2. Leave Trees Closest to
Stream
How does thinningresponse compare to othercommonly used models?
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Used Data from the Desktop Analysis Study
• 150 FPAs from 2003 and 2004, 75 from each year
• Some would not meet now-current DFC Target (325) but allow for comparing model outcomes
• Compared old vs. new DFC Model outcomes and determined they were reasonably similar – used old Model
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Important Characteristics of DFC Model
• Works off total stand age
• Uses 50-yr site index
• Has different variants for WH or DF
• Simulates as if stands were all WH or DF
• Has a background “kill function” for hardwood to simulate senescence
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Site Index Values
• Douglas-fir: 145, 125, 105, 85, 65 for Site Class 1-5, respectively
• Western hemlock: 20’ less for each Site Class, 1-4
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Hardwood Senescence
• Stand age 55, reduce hardwood 20%
• Stand age 65, reduce hardwood 25%
• Stand age 75, reduce hardwood 33%
• Stand age 85, reduce hardwood 50%
• Stand age 95, reduce hardwood 100%
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Thinning from Below
• Less preferred option where Option 2, leave trees closest the stream option is available
• Only option available on Site Class 4, 5 and Site Class 3 Large Stream
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Thinning from Below
• Questions raised post-thinning growth response
• Easier to do using ORGANON – get rid of hardwood at outset so don’t need to replicate senescence scenario
• Time between implementing cut and stage 140 is usually about 80 years
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For Comparison Against FVS and ORGANON
• Converted DFC data to a per acre basis – “expansion factor”
• Set Site Index and age to match those used in the DFC Model
• Used quantitative data from DFC Model as prescription to compare against using FVS and ORGANON
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Forest Vegetation Simulator
• Used PN Variant – 50-yr site index
• For coastal stands used Quinault Location
• For inland stands used Olympic Location
• Hard-wired Site Index and left Habitat Type blank
• Found and used elevation but left slope and aspect at default values
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Forest Vegetation Simulator (Continued)
• Created addfiles to set stand age to a divisor of ten in first cycle and used ten-year cycles thereafter to age 140
• Created an addfile to replicate hardwood senescence in DFC Model
• Created addfiles for each stand to simulate 100% hardwood removal and thin from below
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ORGANON
• Used Management function to 1st remove all hardwood and then thin conifers from below matching the DFC Model harvest
• Grew stand to 138 to 142 yrs old – five-year cycles, no way to adjust
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BAPA @ 140, Post-TFB
Models
Column A Column B Column C
BA
PA
150
200
250
300
350
400
450
500
550
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DF BAPA @ 140, PT
Models
Column A Column B Column C
Y A
xis
150
200
250
300
350
400
450
500
550
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WH BAPA @ 140, PT
Model
Column: 1 Column: 2 Column: 3
BA
PA
150
200
250
300
350
400
450