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: -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

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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 1.tree growth as a function of tree or stand age 2. tree growth as a function of tree size or as function of stand basal area, volume or biomass

CO2FIX compartments

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

Tree growth vs age ***

Current Annual Increment (per age class)

Growth function: biomass determined B i = A (B max – B) B k where B i = biomass increment B = actual biomass B max = maximum attainable biomass A and k = parameters to be estimated

Tree growth vs biomass

Current Annual Increment (per biomass class)

Allocation to other parts of tree B t = B s + B f + B b + B r where B t = Growth of total tree biomass B s = Growth of stem biomass B f = Growth of foliage biomass B b = Growth of branch biomass B r = Growth of root biomass

… as function of stem biomass B f, B b, and B r can be expressed as: B f = F f *B s B b = F b *B s B r = F r *B s where F i = biomass allocation coefficient (F f for foliage, F b for branches, F r for roots)

Coefficient relative to tree age

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

CO2FIX exercise