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CO2FIX Introduction and exercise

CO2FIX Introduction and exercise. Developing Forestry and Bioenergy Projects within CDM Ecuador March, 2004. Contents. Introduction Outline of CO2FIX Exercise. Introduction to CO2FIX. Developed in late 1980s Simple tool; growth table - monospecies Current version 2:

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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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