The Tier 1 method requires activity data on the annual rate of conversion to Forest Land. Activity data should be consistent with those used for estimating changes in carbon stock in biomass on Land Converted to Forest Land, according to the general principles set out in Chapter 3. Activity data can be obtained from national statistics, from forest management agencies, conservation agencies, municipalities, survey and mapping agencies. Where reporting programs are used, it is good practice to implement verification procedures and cross-checks to ensure complete and consistent representation of Land Converted to Forest Land, to avoid omissions or double counting. Data should be disaggregated according to the general climatic categories and forest types.
Inventories using higher Tiers will require more comprehensive information on the establishment of new forests, with refined soil classes, climate, and spatial and temporal resolution.
All changes in dead organic matter pools occurring over the number of years (T) selected as the transition period should be included. Lands where the transitions occurred more than T years ago are transferred to and reported under the category Forest Land Remaining Forest Land.
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