Description
Fixed-depth change in soil carbon mass: area times depth times the difference in dry bulk density times carbon mass fraction; excludes equivalent-soil-mass correction.
A farm or garden budget depends on a common area, quantity, observation period, and system boundary. Recovery, exclusions, overlap, and allocation change how a share is calculated. Supplied accounting or geometry terms remain separate from measured crop performance and verified environmental outcomes.
Fixed-depth change in soil carbon mass: area times depth times the difference in dry bulk density times carbon mass fraction; excludes equivalent-soil-mass correction.
When to use this tool
Use Soil Carbon One Layer Stock Change when you need a clearly bounded area, material, resource, energy, or allocation term for supplied garden or farm records.
How to use the tool and how it works
- Enter area, depth, firstDensity, secondDensity, firstCarbon, secondCarbon. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read stockChange. Use the output convention below.
Calculate stockChange=area*depth*(secondDensity*secondCarbon-firstDensity*firstCarbon). Require nonnegative area, depth, and densities and carbon fractions within zero through one.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| area | Area | Required. Finite number; minimum 0. |
| depth | Depth | Required. Finite number; minimum 0. |
| firstDensity | First Density | Required. Finite number; minimum 0. |
| secondDensity | Second Density | Required. Finite number; minimum 0. |
| firstCarbon | Carbon mass fraction from zero through one, not a percent numeral. | Required. Finite number; minimum 0; maximum 1. |
| secondCarbon | Carbon mass fraction under the same basis. | Required. Finite number; minimum 0; maximum 1. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| stockChange | Stock Change | Required. Finite number. |
{
"input": {
"area": 100,
"depth": 0.2,
"firstDensity": 1000,
"secondDensity": 1100,
"firstCarbon": 0.01,
"secondCarbon": 0.02
},
"output": {
"stockChange": 240
}
}Limitations and assumptions
- Density must be mass per compatible volume and carbon a mass fraction, not a percent numeral. This is a fixed-depth layer comparison, not an equivalent-soil-mass correction, verified sequestration, or full carbon inventory.
- The field tables state structural bounds; the mechanics also specify cross-field constraints. Malformed inputs and unsupported domains cause errors. A successful false flag, empty branch value, or zero placeholder has the meaning stated above and is distinct from an input error.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Signed zero is exported as zero.
Alternative or Complementary methods
Verify the system boundary, units, and source records before combining this term into a resource or environmental report. Physical design and crop-performance questions require appropriate measurements and a broader model.
References
Similar or alternative tools
- Crop Residue Retained Carbon Factor
Return retainedCarbon=residueMass*dryFraction*carbonFraction*retainedFraction.
- Soil Cover Bare Period Duration Term
Subtract summed covered interval lengths from seasonEnd-seasonStart for bareDays.