Table Interpolation Program for Stand Yields (TIPSY)

Table Interpolation Program for Stand Yields (TIPSY) is a publicly distributed PC-based growth and yield program that provides user friendly access to managed stand yield tables generated by TASS and SYLVER.   TIPSY has been in operational use since 1991, and continues to be the primary vehicle for most operational applications of TASS in BC.

The online video tutorial, Introduction to TIPSY 4.2, is also largely applicable to later versions.

TIPSY retrieves and interpolates yield tables from its database, customizes the information and displays summaries and graphics for a specific site, species and management regime. Yield tables are available for all 10 commercial tree species supported by TASS.

Like TASS, TIPSY provides managed stand yield tables for single-species, even-aged stands. TIPSY also provides mixed-species yield tables (without species dynamics) by using simple, area-weighted averaging of single-species yields. TIPSY functions primarily as a “bare ground” model like TASS. Inputs include:

  • Species
  • Initial density
  • Regeneration method (planted or natural)
  • Site index
  • Silvicultural treatments

Although TIPSY is less flexible than TASS, it still supports several silviculture treatments, including:

  • Espacement
  • Fertilization
  • Genetic gain
  • Pre-commercial and commercial thinning
  • Variable retention harvesting

Three spatial distributions (planted, natural, clumped) and a broad range of initial densities (69 to 10,000+ stems/ha) are available.

For scenarios outside the limited range of TIPSY, e.g., spatial distributions, pruning, etc., a custom TASS run service is available by contacting the Growth and Yield Application Specialist.

Di Lucca, C.M., J.W. Goudie, and S.C.Stearns-Smith. 2004. Variable retention yield adjustment factors for TIPSY. B.C. Min. For., Res. Br., Exten. Note 69.

Goudie, J.W.  2011.  Using TIPSY to predict the effect of stand management on quantity and value of carbon and biomassIn: Carbon Management in BC Ecosystems, June 15-16, 2011, Nelson, BC.  Columbia Mountains Institute of Applied Ecology.  p:18-32.

Di Lucca, C.M., S.J. Mitchell, and K.E. Byrne. 2006. Using TIPSY to evaluate windthrow effects on regeneration in variable retention harvests. B.C. Min. For. Range, Res. Br., Victoria B.C. Extension. Note 77.  https://www.for.gov.bc.ca/hfd/pubs/docs/En/En77.pdf

Di Lucca, C. M. and J. W. Goudie, 2007. Variable retention yield adjustments in TIPSY. In Overcoming Obstacles to Variable Retention in Forest Management: Science to Management Forum Proceedings. Prince George, BC. Sept 25-27, 2007. BC Journal of Ecosystems and Management 8(3)