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CO2FIX Introduction and exercise

Learn about CO2FIX, a forestry tool for carbon management and growth simulation. Understand cohort modeling and biomass dynamics for sustainable forestry projects. Access free download to develop bioenergy initiatives.

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CO2FIX Introduction and exercise

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  1. CO2FIXIntroduction and exercise Developing Forestry and Bioenergy Projects within CDM EcuadorMarch, 2004

  2. Contents • Introduction • Outline of CO2FIX • Exercise

  3. Introduction to CO2FIX • Developed in late 1980s • Simple tool; growth table - monospecies • Current version 2: • multi-species and uneven aged stands in multiple cohorts • Age and biomass related growth • Competition • Sophisticated wood product simulation • Soil dynamics • Wider variety of forestry systems

  4. Free download: http://www.efi.fi/projects/casfor • User must be registered

  5. Outline of CO2FIX • Carbon bookkeeping model • Stocks and fluxes of carbon • Biomass • Soil • Wood products • Scale 1 ha; time step 1 year

  6. Cohort model Cohort: a group of individual trees or a group of species, which are assumed to exhibit similar growth, and which may be treated as single entities within the model

  7. Cohort model • tree growth as a function of tree or stand age • tree growth as a function of tree size or as function of stand basal area, volume or biomass

  8. CO2FIX compartments

  9. Growth function: age determined a = A / (1 + e -[ +( kt/v)]) where a = the attribute (e.g. stand biomass) at time t A = the final value of the attribute (the maximum stand biomass) attained t = time, and , k and v are the parameters

  10. Tree growth vs age ***

  11. Current Annual Increment (per age class)

  12. Growth function: biomass determined Bi = A (Bmax – B) Bk where Bi = biomass increment B = actual biomass Bmax = maximum attainable biomass A and k = parameters to be estimated

  13. Tree growth vs biomass

  14. Current Annual Increment (per biomass class)

  15. Allocation to other parts of tree Bt = Bs + Bf + Bb+ Br where Bt = Growth of total tree biomass Bs = Growth of stem biomass Bf = Growth of foliage biomass Bb = Growth of branch biomass Br = Growth of root biomass

  16. … as function of stem biomass Bf, Bb, and Br can be expressed as: Bf = Ff*Bs Bb = Fb*Bs Br = Fr*Bs where Fi = biomass allocation coefficient (Ff for foliage, Fb for branches, Fr for roots)

  17. Coefficient relative to tree age

  18. Management intervention • Age at which the intervention takes place • Intensity of the intervention (fraction of cohort biomass removed) • Allocation of the biomass removed to different “raw material” classes as slash, logwood and pulpwood

  19. CO2FIX exercise

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