Hardwood Growth and Yield Model (Growth & Yield 1.1.0) Project Report 2005 Tim McGrath Rob O’Keefe...
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Transcript of Hardwood Growth and Yield Model (Growth & Yield 1.1.0) Project Report 2005 Tim McGrath Rob O’Keefe...
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Hardwood Growth and Yield Model(Growth & Yield 1.1.0)
Project Report 2005
Tim McGrathRob O’KeefeBrad MacPhee
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Hardwood GNY Model
Computer model Predicts yields of even-aged single species
hardwood stands Compare results of managed vs unmanaged Help prescribe treatment timing and
intensity
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CFRU Deliverables
Re-measurement of Hardwood PSPsCompleted 2004
Refinement of Hardwood GNY ModelCompleted 2005
User Manual/Model descriptionDraft 2005
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Hardwood GNY 1.1.0
Items to Cover:Model DevelopmentDemonstrationApplication
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Development
Objectives:Refit existing growth function to a PSP database
that has nearly doubled in size since 1997
Investigate updating existing or developing new functions to better capture species group and site class variation
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Development HighlightsThe Data
Key Classifications:Treatment, Species Group, Site Index
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Dev
elop
men
t Hig
hlig
hts
The
Mod
el 2005 Hardwood Growth and Yield ModelFlow diagram of primary functions:
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Development HighlightsExample: Manage Stand Diameter Function (F18)
Species Group Incorporation
TD as ƒ(SIB,TBA,Species Group)
Model:
251410 32 DVDVeSIBTD TBASIB
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Eva
luat
ion
Res
ults
2005 Hardwood Growth and Yield Model 1997 and 2005 Model Performance Comparison:
TolerantGroup
IntolerantGroup
AspenGroup
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Demonstration
Single Run Mode Input
The 7 steps, Help Output
Definitions, Graphing
Batch Mode Input
Text files Output
Text, HTML
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Hardwood GNY 1.1.0Input
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Hardwood GNY 1.1.0Output
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Hardwood GNY 1.1.0Output
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Application Samples
Pre-commercial Thinning spacing Commercial Thinning timing Commercial Thinning vs no treatment
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Pre-Commercial Spacing?
8’x8’6’x6’
6” Dbh
4” Dbh
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Commercial Thinning Timing?(Pre-commercial Thin@ 20 to 8’)
Thin@35 Thin@50
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Commercial Thinning or Not?
Thin@60&85
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Growth & Yield 1.1.0
Download modelhttp://www.gov.ns.ca/natr/forestry/gny2004/gro
wthandyield.htm
CommentsTim McGrath NSDNR (902) 893-5683 [email protected]