## Afolu General Equations

Equation 2.1

Annual carbon stock changes for the entire afolu sector estimated as the sum of

CHANGES IN ALL LAND-USE CATEGORIES

Where:

AC = carbon stock change

Indices denote the following land-use categories:

 AFOLU = Agriculture, Forestry and Other Land Use FL = Forest Land CL = Cropland GL = Grassland WL = Wetlands SL = Settlements OL = Other Land Where:

AClu = carbon stock changes for a land-use (LU) category as defined in Equation 2.1.

i = denotes a specific stratum or subdivision within the land-use category (by any combination of species, climatic zone, ecotype, management regime etc., see Chapter 3), i = 1 to n.

Equation 2.3

Annual carbon stock changes for a stratum of a land-use category as a sum of

CHANGES IN ALL POOLS

Where:

AClu = carbon stock changes for a stratum of a land-use category Subscripts denote the following carbon pools: AB = above-ground biomass BB = below-ground biomass DW = dead wood LI = litter SO = soils

HWP = harvested wood products

Equation 2.4

Annual carbon stock change in a given pool as a function of gains and losses

(Gain-Loss Method)

Where:

AC = annual carbon stock change in the pool, tonnes C yr-1 ACG= annual gain of carbon, tonnes C yr-1 ACl= annual loss of carbon, tonnes C yr-1

Equation 2.5

Carbon stock change in a given pool as an annual average difference between

ESTIMATES AT TWO POINTS IN TIME (STOCK-DIFFERENCE METHOD)

Where:

AC = annual carbon stock change in the pool, tonnes C yr-1 Cti = carbon stock in the pool at time t1, tonnes C

Ctj = carbon stock in the pool at time t2, tonnes C

Equation 2.6 NON-CO2 emissions to the atmosphere

Where:

Emission = non- CO2 emissions, tonnes of the non-CO2 gas

A = activity data relating to the emission source (can be area, animal numbers or mass unit, depending on the source type)

EF = emission factor for a specific gas and source category, tonnes per unit of A 