Steps in Applying Procomap

There are several modules of PROCOMAP for different types of mitigation projects, as described earlier in the chapter. Here, an example of one of the mitigation project types, namely reforestation, is used to demonstrate the steps involved in estimating the carbon sequestration in a short-rotation or long-rotation forest or plantation project. The model estimates the carbon stock changes in the baseline scenario, mitigation scenario and the incremental carbon stocks.

Step 1: Define land use categories

° Define land categories relevant to baseline as well as mitigation scenario, for example, degraded land, forest land and plantation categories

Step 2: Define baseline area under different land categories

° Select the baseline land category and define the area for a selected base year (e.g. 2007) and project the area under this category annually for future years up to, say, 2037

° If any projections are available for the project area or region or national level for the land category selected, use them

° If no projections are available, make projections using demographic, social and economic factors

° Note that the degraded land area is normally taken to remain stable or increase over the years whereas forest area is assumed to decline because of anthropogenic pressures

Step 3: Estimate the area under reforestation options

° Select the reforestation option such as short-rotation or long-rotation forest plantation

° Enter area to be reforested yearly (e.g. from 2007 to 2037, which could be constant or vary from year to year

Step 4: Estimate carbon densities in soil and vegetation under baseline scenario

° Enter the carbon densities of vegetation (above-ground woody biomass) and soil in tC/ha

° Add soil carbon density and vegetation carbon density to get total carbon density/hectare

Step 5: Calculate carbon density under the mitigation scenario

(i) Vegetation or biomass

° Enter rotation period, carbon density (normally 0.5 tC/t of woody biomass) and rate of carbon accumulation (tC/ha/year) in vegetation under the mitigation scenario for the activities chosen ° The rate of carbon accumulation depends on a number of factors such as tree species, density, rainfall, nutrient supplements and rotation period ° Define rotation period, which could vary for different reforestation options

- Short-rotation forestry: 5-10 years

- Long-rotation forestry (for sawn wood): 30-50 years

- Carbon sequestration storage projects: duration indefinite

° Enter rate of carbon accumulation in soil carbon for the activities selected (tC/ha/year) under reforestation option, which involve planting trees, soil carbon density increases due to litter fall and decomposition

(iii) Carbon in decomposing matter

° Enter the carbo3n density in decomposing matter (tC/ha) and the decomposing period

(iv) Carbon in wood products

° Enter the carbon stock in the product pool (tC/ha) and the average age of retention of carbon in the products ° The woody biomass sequestered and harvested has diverse end-uses, where carbon emissions occur at different periods

° Potential uses are

- As fuelwood, where combustion leads to carbon emission instantly

- As industrial roundwood (for pulp production), where emissions occur over 2-5 years

- As sawn wood for long-term storage, where emissions occur after 30-50 years

Step 6: Generate outputs of the PROCOMAP REFOREST module

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