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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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CO2FIXIntroduction and exercise Developing Forestry and Bioenergy Projects within CDM EcuadorMarch, 2004
Contents • Introduction • Outline of CO2FIX • Exercise
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
Free download: http://www.efi.fi/projects/casfor • User must be registered
Outline of CO2FIX • Carbon bookkeeping model • Stocks and fluxes of carbon • Biomass • Soil • Wood products • Scale 1 ha; time step 1 year
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
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
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
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
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
… 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)
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