are we making the right choices with our jack pine plantations ?
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Are we making the right choices with our jack pine plantations ?. R. Schneider, F. Berninger Capsis workshop June 2008. Lumber industry in Quebec. Spruce, pine and fir are the most important species for the forest industry in Quebec and eastern Canada - PowerPoint PPT PresentationTRANSCRIPT
Are we making the right choices with our jack pine
plantations ?
R. Schneider, F. Berninger
Capsis workshop
June 2008
Lumber industry in Quebec
• Spruce, pine and fir are the most important species for the forest industry in Quebec and eastern Canada
• In 2005, 30.5 M m3 of softwood was used by the lumber industry, representing 75% of the total harvested volume
Jack pine in Quebec
• 2nd most important reforestation species in the province (21.3 M seedlings for 13 200 ha in 2005)
• Spacing:– In the mid 70s: 2500 st/ha– In the mid 90s: 1750 st/ha
Reasons for changing spacing
• Economic reasons:– Less costly to establish and thin
• Silviculture:– Larger trees with longer crowns at 1st thinning– Lower mortality with container seedlings
(10%, 8 years after) than with bare-root seedlings (33% , 8 years after) (Trottier 1998)
What about lumber quality ?
• Knots cause up to 50% of the visual downgrades in jack pine plantation-grown lumber (Zhang et al. 2005)
• However, there are still uncertainties with respect to wood quality:– How do we manage our existing plantations ?– Should we establish our plantations in the
same way ?
General objective
• Develop or adapt a tool to predict the effect of different scenarios on the growth and wood quality of jack pine
General objective
• Develop or adapt a tool to predict the effect of different scenarios on the growth and wood quality of jack pine
Our choice:
PipeQual (Mäkelä and Mäkinen 2003)
Why Capsis ?
• PipeQual is a complex model, where simulation software is essential
• Originally coded in Fortran by A. Mäkelä, a working copy was developed in Matlab to test Jack pine model adaptations
• We now need to transfer the results to our project partners, hence our interest in Capsis
PipeQual structure(Mäkelä and Mäkinen 2003)
Structuralparameters
Distribution of growth by whorls
TREE WHORL
Modeloutputs
Initialconditions
BRANCH
Internodal whorls ?
Nodal whorl
Internodal whorl
Adjustment to PipeQual framework
Wf
Nodal
Inter nodal
Wfi
Wfi
Abi
Abi
Asi
Integration into Capsis
GIdCard
GSettings
GModel MethodProvider
GStand
GTCStand
GTree
Step
Scenario
CModel
GrowthEngine
CStand CTree CSpecies
PipeQualSpecies
PipeQualWhorl
IdCard
JpSettings
JpModel
JpMethodProvider
JpStand
JackPineTree
JackPineSpecies
CSettings
capsis.kernel
capsis.lib.crobas
jackpine.model
Types of output
GTraditional G & Y outputs
Types of output
G
Hdom, Hmean, crown base
Traditional G & Y outputs
Types of output
Traditional G & Y outputsG
Hdom, Hmean, crown base
Volume
Types of output
Tree level detail
Work in progress
• Provide methods to extract and illustrate cumulative branch basal area from whorl objects
• Integrate branch module to Capsis (already programmed in Matlab)
• Integrate links to and from bucking and sawing simulator to yield knot size and location on lumber and visual lumber grading
Future developments
• Integrate other species : black spruce, white spruce, trembling aspen
• Extend simulations from homogeneous stands to mixed/complex structured stands
Acknowledgements
• Research collaborators: É. Beaulieu, J. Bégin, P. Bernier, S. D’eon, H. Power, G. Prégent, E. Swift, C.H. Ung, S.Y. Zhang
• External collaborator: Annikki Mäkelä