The following summarizes steps for estimating change in carbon stocks in dead organic matter using the default methods
Step 1: Estimate area converted to Forest Land (during the period 20 years prior to the year of inventory) from other land-use categories such as Cropland, Grassland and Settlements. Refer to Chapter 3 for detailed approaches for estimating Land Converted to Forest Land.
Step 2: The Tier 1 assumption is that dead organic matter (dead wood and litter) carbon stocks on non-forest land are zero. If national data on dead wood and litter carbon stocks in non-forest land are available, disaggregate the area converted to Forest Land according to the land-use category of origin, e.g., Grassland, Cropland, etc., using the same categories for which dead organic matter estimates are available. Default values for litter carbon stocks in Forest Land are provided in Table 2.2. Statistically valid, regional default estimates for dead wood carbon stocks in forests are not available.
Step 3: Estimate the average annual increment of dead organic matter stocks, separately for dead wood and litter, by dividing the difference in pre- and post-conversion carbon stocks by the time period of transition (Equation 2.23 in Chapter 2). The default Tier 1 assumption is that non-forest dead organic matter carbon stocks are zero and that the period of transition is 20 years.
Step 4: Estimate the annual change in carbon stock in dead organic matter on Land Converted to Forest Land by multiplying the average annual increment (Step 3) by the area of lands converted to Forest Land over the past 20 (default) years.
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