are we making the right choices with our jack pine plantations ?

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