hardwood growth and yield model (growth & yield 1.1.0) project report 2005 tim mcgrath rob...
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Hardwood Growth and Yield Model(Growth & Yield 1.1.0)
Project Report 2005
Tim McGrathRob O’KeefeBrad MacPhee
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
CFRU Deliverables
Re-measurement of Hardwood PSPsCompleted 2004
Refinement of Hardwood GNY ModelCompleted 2005
User Manual/Model descriptionDraft 2005
Hardwood GNY 1.1.0
Items to Cover:Model DevelopmentDemonstrationApplication
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
Development HighlightsThe Data
Key Classifications:Treatment, Species Group, Site Index
Dev
elop
men
t Hig
hlig
hts
The
Mod
el 2005 Hardwood Growth and Yield ModelFlow diagram of primary functions:
Development HighlightsExample: Manage Stand Diameter Function (F18)
Species Group Incorporation
TD as ƒ(SIB,TBA,Species Group)
Model:
251410 32 DVDVeSIBTD TBASIB
Eva
luat
ion
Res
ults
2005 Hardwood Growth and Yield Model 1997 and 2005 Model Performance Comparison:
TolerantGroup
IntolerantGroup
AspenGroup
Demonstration
Single Run Mode Input
The 7 steps, Help Output
Definitions, Graphing
Batch Mode Input
Text files Output
Text, HTML
Hardwood GNY 1.1.0Input
Hardwood GNY 1.1.0Output
Hardwood GNY 1.1.0Output
Application Samples
Pre-commercial Thinning spacing Commercial Thinning timing Commercial Thinning vs no treatment
Pre-Commercial Spacing?
8’x8’6’x6’
6” Dbh
4” Dbh
Commercial Thinning Timing?(Pre-commercial Thin@ 20 to 8’)
Thin@35 Thin@50
Commercial Thinning or Not?
Thin@60&85
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]