Carbon Credits (Carbon Farming Initiative—Estimation of Soil Organic Carbon Sequestration Using Measurement and Models) Methodology Determination 2021
Subdiv 4Model-assisted soil organic carbon stock estimation and its sampling variance in the CEA for each estimation event
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Subdivision 4—Model-assisted soil organic carbon stock estimation and its sampling variance in the CEA for each estimation event
26 Application of this subdivision
This Subdivision estimates soil organic carbon stock and its sampling variance using modelled soil organic carbon estimates and model-validation samples as required by subsection 14(5) of this Schedule.
27 Working out the modelled soil organic carbon stock in each layer of each stratum
(1) The modelled soil organic carbon stock View image in the official source for each stratum h in the CEA, for the 0-30 cm and 0-x cm layers, in tonnes of organic carbon per hectare, must be worked out under the subsection (2) or (3) based on the relationship between:
(a) the mass of oven dry whole soil in the stratum estimated by a modelled carbon stock estimate for the estimation event in accordance with any requirements in the Supplement (View image in the official source) for the layer (0-30 cm or 0-x cm), in tonnes of oven dry whole soil per hectare; and
(b) the equivalent soil mass (the ESM) defined for the CEA in the first estimation event given by section 13 of this Schedule, in tonnes of oven dry whole soil per hectare.
View image in the official source is the mean modelled soil organic carbon stock in a soil sub-layer, for stratum h, determined by a modelled carbon stock estimate for the estimation event in accordance with the requirements in the Supplement, in tonnes of soil organic carbon per hectare.
View image in the official source is the number of sub-layers progressing incrementally down from the soil surface required to produce a value for View image in the official source that is equal to or exceeds the ESM for the CEA given by section 13 of this Schedule, in tonnes of oven dry whole soil per hectare.
View image in the official source is the modelled soil organic carbon stock in a soil sub-layer, for stratum h, determined by a modelled carbon stock estimate for the estimation event in accordance with the requirements in the Supplement, in tonnes of soil organic carbon per hectare.
View image in the official source is the sum of modelled soil organic carbon stocks in all sub-layers excluding sub-layer n, for stratum h, determined by a modelled carbon stock estimate for the estimation event in accordance with any requirements in the Supplement, in tonnes of soil organic carbon per hectare.
View image in the official source is the modelled soil organic carbon stock in the soil sub-layer n, for stratum h, determined by a modelled carbon stock estimate for the estimation event in accordance with any requirements in the Supplement, in tonnes of soil organic carbon per hectare.
ESM is the equivalent soil mass for the CEA given by section 13 of this Schedule, in tonnes of oven dry whole soil per hectare.
View image in the official source is the modelled oven dry mass of whole soil within a sub-layer, for stratum h, determined by a modelled carbon stock estimate for the estimation event in accordance with any requirements in the Supplement, in tonnes of oven dry whole soil per hectare.
View image in the official source is the sum of the mass of oven dry whole soil in all sub-layers excluding sub-layer n, for stratum h, estimated by a by a modelled carbon stock estimate for the estimation event in accordance with the requirements in the Supplement, in tonnes of oven dry soil per hectare.
View image in the official source is the modelled mass of oven dry whole soil contained in the soil sub-layer n, for stratum h, estimated by a modelled carbon stock estimate for the estimation event in accordance with the requirements in the Supplement, in tonnes of oven dry soil per hectare.
28 Mean modelled soil organic carbon stock in a CEA
Work out the mean modelled soil organic carbon stock for the CEA (the ModView image in the official source), in tonnes of soil organic carbon per hectare, using the following equation:
View image in the official source is the relative area of the CEA covered by stratum h in the CEA, expressed as a proportion of the total CEA.
View image in the official source is the mean soil organic carbon stock in the stratum h, in tonnes of soil organic carbon per hectare, worked out using section 21 of this Schedule.
29 Working out the modelled soil organic carbon stock for each model-validation site
(1) The modelled soil organic carbon stock View image in the official source for each model-validation site i in the CEA, within the 0-30 cm and 0-x cm layers, in tonnes of organic carbon per hectare, must be worked out under the subsection (2) or (3) based on the relationship between:
(a) the modelled mass of oven dry whole soil (View image in the official source) estimated by a modelled carbon stock estimate for the estimation event, for a model-validation site i, in the layer (0-30 cm or 0-x cm), worked out in accordance with any requirements in the Supplement, in tonnes of oven dry whole soil per hectare; and
(b) the equivalent soil mass (ESM) defined for the CEA where the soil samples were collected in the baseline sample round given by section 13 of this Schedule, in tonnes of oven dry whole soil per hectare.
Note: The value of n increases with increasing depth such that sub-layer 1 denotes the soil sub-layer including the soil surface and sub-layer n denotes the deepest sub-layer that contributes to equation 91 as required by the Supplement.
View image in the official source is the modelled soil organic carbon stock in a soil sub-layer for model-validation site i, determined by a modelled carbon stock estimate for the estimation event in accordance with any requirements in the Supplement, in tonnes of soil organic carbon per hectare.
View image in the official source is the number of sub-layers progressing incrementally down from the soil surface required to produce a value for View image in the official source that is equal to or exceeds the ESM for the CEA given by section 13 of this Schedule, in tonnes of oven dry whole soil per hectare.
View image in the official source is the modelled soil organic carbon stock in a soil sub-layer for model-validation site i determined by a modelled carbon stock estimate for the estimation event, in accordance with any requirements in the Supplement, in tonnes of soil organic carbon per hectare.
View image in the official source is the sum of modelled soil organic carbon stocks, for model-validation site i, in all sub-layers excluding sub-layer n, determined by a modelled carbon stock estimate for the estimation event, in accordance with any requirements in the Supplement, in tonnes of soil organic carbon per hectare.
View image in the official source is the modelled soil organic carbon stock, for model-validation site i, in sub-layer n, determined by a modelled carbon stock estimate for the estimation event, in accordance with any requirements in the Supplement, in tonnes of soil organic carbon per hectare.
ESM is the equivalent soil mass for the CEA given by section 13 of this Schedule, in tonnes of oven dry whole soil per hectare.
View image in the official source is the modelled oven dry mass of whole soil within a sub-layer, for model-validation site i, estimated by a modelled carbon stock estimate for the estimation event in accordance with the requirements in the Supplement, in tonnes of oven dry soil per hectare.
View image in the official source is the sum of the modelled mass of oven dry whole soil, for model-validation site i, in all sub-layers excluding sub-layer n, estimated by a modelled carbon stock estimate for the estimation event in accordance with the requirements in the Supplement, in tonnes of oven dry soil per hectare.
View image in the official source is the modelled mass of oven dry whole soil, for model-validation site i, in sub-layers n, estimated by a modelled carbon stock estimate for the estimation event in accordance with the requirements in the Supplement, in tonnes of oven dry soil per hectare.
Subdivision Subdiv 4 - Carbon Credits (Carbon Farming Initiative—Estimation of Soil Organic Carbon Sequestration Using Measurement and Models) Methodology Determination 2021 - Model-assisted soil organic carbon stock estimation and its sampling variance in the CEA for each estimation event | Zoe