Resource Practices Branch FY2012-13 Consultants’ Report by: Steve Stearns-Smith, RPF and Wendy Bergerud Project Debriefing Meeting 03 April 2013 Initializing.

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Presentation transcript:

Resource Practices Branch FY Consultants’ Report by: Steve Stearns-Smith, RPF and Wendy Bergerud Project Debriefing Meeting 03 April 2013 Initializing TIPSY 4.3 with Silviculture Survey (RESULTS) Data

Backcasting, the opposite of forecasting. 2

Forest Analysis and Inventory BranchResource Practices Branch Project Intent A first approximation of standard operating procedures. Primary emphasis on initial density and spatial distribution, building on Wendy’s analyses. Other aspects secondary (OAFs, etc) i.e., conceptual, no supporting analysis. General procedures to support TSR, SDM, FFT, etc. 3 Initializing TIPSY with SilvSurvey Data

Forest Analysis and Inventory BranchResource Practices Branch Reflects SilvSurvey Limitations Not designed to support TIPSY (free-growing declaration, not GY) Broader range of stand conditions than TIPSY (therefore, follow historic practice standards for other TIPSY apps) Survey Standards may sound supportive, but always check field practices (e.g., NP) Potential for ocular surveys (no plot data) 4 Initializing TIPSY with SilvSurvey Data

Forest Analysis and Inventory BranchResource Practices Branch Reflects TIPSY Limitations Long list in report, key limitations include: – bare ground (why backcasting is required) – single-species, even-age – does not predict ingress or natural disturbance events – regen method implications – mixed-species implications – OAF implications Backcasting even more limited in some areas 5 Initializing TIPSY with SilvSurvey Data

Forest Analysis and Inventory BranchResource Practices Branch Regen Method (P,N,C) Implications Independent from regen delay Defines fixed seedling establishment period (EP) Planted = 1yr Natural & Clumped =~10yrs Defines fixed spatial distribution (SD) Planted = square spacing Natural = random Clumped = clumped random (one clumpiness) Regen method, EP & SD are not independent in TIPSY Genetic gain only applied to Planted 6 Initializing TIPSY with SilvSurvey Data

Natural (or Clumped) Regen Delay = 2yr (default = 2) (additional 1yr germination lag plus ~10yr establishment period are fixed) Stand Disturbance TIPSY-age Planted Regen Delay = 1yr (default = 0) (no accommodation for natural ingress) 0 Note how Natural and Clumped make poor surrogates for Planted plus ingress: Wrong temporal distribution No genetic gain 7

Forest Analysis and Inventory BranchResource Practices Branch TIPSY Mixed-Species Implications 1 ha: 75% Fd + 25% Pl Same regen method & spatial distribution Same initial density Different site indexes Different mortality rates** Backcasting methods not established yet. 8 Initializing TIPSY with SilvSurvey Data

Forest Analysis and Inventory BranchResource Practices Branch OAF Implications OAF effectLosses included in survey densities? OAF1a – NPNo, unmapped NP not sampled (plots dropped). OAF1b – non-comm vegYes, once it is established. OAF1c – endemic FHSome, only those already expressed. OAF1d – misc eventsSome to none, random by nature. OAF2 – DWB (TSR use)No. Also consider the alternate TIPSY DWB OAF option. OAF2 -- alt. FH useSome, see OAF1c. (just different pattern) 9 Initializing TIPSY with SilvSurvey Data Ideally, add back the included losses before backcasting. Then (re)apply full values to forecast.

Forest Analysis and Inventory BranchResource Practices Branch Opportunities to Modify TIPSY’s Existing Stand Routine 10 Initializing TIPSY with SilvSurvey Data Already incorporates: – Single-species, site index, regen delay, OAFs, PCT – Initial density backcasting (<10K sph), given regen method (spatial dist) Backcasting by interpolation, no functions to refit. Additional potential: – Batch TIPSY implementation – Regen method (spatial dist) backcasting – Partial OAFs in backcasting – Maybe: mixed-species, genetics, etc.

Questions? 11