15 september 2003 smc fall policy meeting treelab (v1.0) variable-density yield simulator for...
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15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
TreeLab (v1.0)TreeLab (v1.0)Variable-density Yield Variable-density Yield
Simulator for Immature, Simulator for Immature, Managed Stands of Douglas-Managed Stands of Douglas-
fir fir
Sam D. PittmanSam D. Pittman
Eric C. TurnblomEric C. Turnblom
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
TreeLab – TopicsTreeLab – Topics
Introduction / backgroundIntroduction / background
Model / TheoryModel / Theory
Operation / OutputOperation / Output
Results / Discussion Results / Discussion
Conclusions / QuestionsConclusions / Questions
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
TreeLab - IntroductionTreeLab - Introduction
Early Growth & Development of Immature, Early Growth & Development of Immature, Managed Stands of Douglas-firManaged Stands of Douglas-fir
Basically targeted the use of Type I and II Basically targeted the use of Type I and II installations to develop variable-density, installations to develop variable-density, managed stand growth & yield tables managed stand growth & yield tables
TreeLab is a variable-density, managed TreeLab is a variable-density, managed stand simulator fit to all Type I and II datastand simulator fit to all Type I and II data
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
TreeLab - Introduction (2)TreeLab - Introduction (2) Turnblom, E.C. and T.E. Burk. 2000. Modeling Turnblom, E.C. and T.E. Burk. 2000. Modeling
self-thinning of unthinned Lake States red pine self-thinning of unthinned Lake States red pine stands using nonlinear simultaneous differential stands using nonlinear simultaneous differential equations. Can. J. For. Res. 30: 1410 -1418 equations. Can. J. For. Res. 30: 1410 -1418
Pittman, S.D. and E.C. Turnblom. 2003. A study Pittman, S.D. and E.C. Turnblom. 2003. A study of self-thinning using coupled allometric of self-thinning using coupled allometric equations: implications for coastal Douglas-fir equations: implications for coastal Douglas-fir stand dynamics. Can. J. For. Res. 33:1662 -1669stand dynamics. Can. J. For. Res. 33:1662 -1669
The model in TreeLab extends the previous work The model in TreeLab extends the previous work by including the simulation of fertilization and by including the simulation of fertilization and thinning treatment regimesthinning treatment regimes
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
TreeLab – Model TheoryTreeLab – Model Theory
Every stand has a unique self-thinning Every stand has a unique self-thinning trajectory boundary driven by its unique trajectory boundary driven by its unique stand allometrystand allometry
Stand allometry is dynamic, not static; Stand allometry is dynamic, not static; allometric relationships change with stage allometric relationships change with stage of developmentof development
Dynamic allometry is captured through Dynamic allometry is captured through simultaneous, coupled rate equationssimultaneous, coupled rate equations
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
TreeLab – Model Theory (2)TreeLab – Model Theory (2) The rate at which a stand variable changes is The rate at which a stand variable changes is
found by differencing gross growth & found by differencing gross growth & respiration (anabolic & catabolic processes, respiration (anabolic & catabolic processes, respectively)respectively)
The magnitudes of the anabolic and catabolic The magnitudes of the anabolic and catabolic processes depend on the current state of the processes depend on the current state of the stand and is affected by site quality stand and is affected by site quality
The current state of the stand can be The current state of the stand can be described by the triplet (stand basal area, described by the triplet (stand basal area, quadratic mean DBH, and dominant height)quadratic mean DBH, and dominant height)
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
TreeLab –Model Theory (3)TreeLab –Model Theory (3)
For TreeLab, the site quality rate For TreeLab, the site quality rate adjustment factor was modified to allow for adjustment factor was modified to allow for fertilization and any interaction between fertilization and any interaction between the two:the two:
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
TreeLab – Operation / TreeLab – Operation / OutputOutput
Conventional “Windows” interface Conventional “Windows” interface giving Point & click operation giving Point & click operation
How to define stand parameters and How to define stand parameters and treatment actionstreatment actions
How to print and / or save yield table How to print and / or save yield table outputoutput
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
TreeLab – Results / TreeLab – Results / DiscussionDiscussion
Three example treatment regimes: 1) do Three example treatment regimes: 1) do nothing, 2) thinning RD55 -> RD35, and 3) nothing, 2) thinning RD55 -> RD35, and 3) fertilizing every twenty years, beginning in fertilizing every twenty years, beginning in first year; two initial conditions:first year; two initial conditions:
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
TreeLab – Results / TreeLab – Results / DiscussionDiscussion
Low site QMD evolution:Low site QMD evolution:
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
TreeLab – Results / TreeLab – Results / DiscussionDiscussion
Low site (derived) TPA evolution:Low site (derived) TPA evolution:
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
TreeLab – Results / TreeLab – Results / DiscussionDiscussion
High site BA evolution:High site BA evolution:
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
TreeLab – Results / TreeLab – Results / DiscussionDiscussion
High site H40 evolution:High site H40 evolution:
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
TreeLab – ConclusionTreeLab – Conclusion Model propositionsModel propositions
Unique self-thinning boundary for each standUnique self-thinning boundary for each stand
Stand allometry is dynamic, not staticStand allometry is dynamic, not static
Changes in stand attributes are represented as a Changes in stand attributes are represented as a coupled system of rate equations that govern coupled system of rate equations that govern allometryallometry
Uses all Type I and II data including fertilization Uses all Type I and II data including fertilization and thinning available through growth year 2000and thinning available through growth year 2000
Output consistent with range of data spannedOutput consistent with range of data spanned
15 September 200315 September 2003 SMC Fall Policy MeetingSMC Fall Policy Meeting
TreeLab – ConclusionTreeLab – Conclusion
Please visit <http:://www.standmgt.org/>Please visit <http:://www.standmgt.org/>
To download, click on the TREELAB link To download, click on the TREELAB link (LHS)(LHS)
DiscussionDiscussion
Eric C. Turnblom <[email protected]>Eric C. Turnblom <[email protected]>