Carbon Credits (Carbon Farming Initiative—Measurement of Soil Carbon Sequestration in Agricultural Systems) Methodology Determination 2018
8Calculating the soil organic carbon stock for a CEA and sampling variance
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8 Calculating the soil organic carbon stock for a CEA and sampling variance
(1) The following parameters must be calculated in accordance with Subdivision 2 or 3 for each sampling round:
(a) the soil organic carbon stock in a CEA (the SOCCEA), in tonnes of soil organic carbon per CEA, for each sampling round;
(b) the sampling variance of the View image in the official source for the CEA (the View image in the official source), in tonnes of carbon per CEA squared.
(2) The relevant Subdivision must first be applied to the 0–30 cm layer.
(a) the 30–x cm layer must be analysed separately: and
(b) the results of the analysis of the 0–30 cm layer and the 30–x cm layer must be added together or combined to apply the relevant Subdivision to the 0–x cm layer in accordance with any requirements in the Supplement.
Note: The addition or combining of the results in accordance with the Supplement may include requirements for weighting or adjustments to ensure that they are applicable to the equations and overall carbon stock of the sample.
Subdivision 2—Where both compositing of cores across strata and equal area stratification are used
9 Application of this Subdivision
This subdivision applies to sampling which involves:
(a) compositing of cores across strata for carbon analysis; and
(b) strata which are equal in area across a CEA.
Note: For other sampling designs—see Subdivision 3. Because of these requirements all samples in this Subdivision are composite samples.
10 Soil organic carbon stock for a CEA
Calculate the soil organic carbon stock for a CEA for each sample i (the SOCCEAi), in tonnes of soil organic carbon per CEA, using the following equation:
| View image in the official source | equation 11 |
SOCi is SOCi for each sample i, in tonnes of carbon per hectare, given by equation 9 or 10.
11 Total soil organic carbon stock for a CEA
The View image in the official source, in tonnes of carbon per CEA, is given by the following equation:
| View image in the official source | equation 12 |