Carbon Credits (Carbon Farming Initiative—Estimation of Soil Organic Carbon Sequestration Using Measurement and Models) Methodology Determination 2021
Subdiv 2Working out the soil organic carbon stock and variance for a CEA where both compositing of cores across strata and equal area stratification are used
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Subdivision 2—Working out the soil organic carbon stock and variance for a CEA where both compositing of cores across strata and equal area stratification are used
14 Application of this Subdivision
This subdivision applies to sampling which involves:
(a) compositing of cores across strata for carbon analysis; and
(b) strata that are equal in area within a CEA.
Note: For other sampling designs—see Subdivision 3. Because of these requirements all samples in this Subdivision are composite samples.
15 Mean soil organic carbon stock in a CEA
Work out the mean soil organic carbon stock in the CEA (the View image in the official source), in tonnes of soil organic carbon per hectare, using the following equation:
| View image in the official source | equation 54 |
View image in the official source is an identifier for each composite soil sample collected from the CEA.
n is the total number of composite soil samples collected from the CEA.
SOCi is the value for SOCi, in tonnes of soil organic carbon per hectare, worked out using equation 52 or 53 for each sample i collected from the CEA.
16 Sampling variance of the mean soil organic carbon stock within a CEA
Work out the sampling variance of the mean soil organic carbon stock in the CEA (the View image in the official source) in (tonnes of soil organic carbon per hectare)2 using the following equation:
| View image in the official source | equation 55 |
View image in the official source is an identifier for each composite soil sample collected from the CEA
n is the total number of composite soil samples collected from the CEA.
View image in the official source is the soil organic carbon stock for composite soil sample , in tonnes of soil organic carbon per hectare, worked out using equation 52 or 53.