Description
Divide each mass by its matching molar mass; carbonPerPhosphorus and nitrogenPerPhosphorus are the corresponding mole ratios to phosphorus.
Ecological energy and nutrient efficiencies depend on which production, ingestion, assimilation or concentration basis is used. Molar nutrient ratios differ from mass ratios, and a local balance is not a complete ecosystem budget.
Divide each mass by its matching molar mass; carbonPerPhosphorus and nitrogenPerPhosphorus are the corresponding mole ratios to phosphorus.
When to use this tool
Use Ecological Stoichiometry Cnp Molar Factor when checking a supplied ecological budget or nutrient-normalization term.
How to use the tool and how it works
- Enter carbonMass, nitrogenMass, phosphorusMass, carbonMolarMass, nitrogenMolarMass, phosphorusMolarMass. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read carbonMoles, nitrogenMoles, phosphorusMoles, carbonPerPhosphorus, nitrogenPerPhosphorus. Use the output convention below.
Require nonnegative carbonMass and nitrogenMass, positive phosphorusMass and positive molar masses. Divide each mass by its matching molar mass; carbonPerPhosphorus and nitrogenPerPhosphorus are the corresponding mole ratios to phosphorus.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| carbonMass | Carbon Mass | Required. Finite number; minimum 0. |
| nitrogenMass | Nitrogen Mass | Required. Finite number; minimum 0. |
| phosphorusMass | Phosphorus Mass | Required. Finite number; strictly above 0. |
| carbonMolarMass | Carbon Molar Mass | Required. Finite number; strictly above 0. |
| nitrogenMolarMass | Nitrogen Molar Mass | Required. Finite number; strictly above 0. |
| phosphorusMolarMass | Phosphorus Molar Mass | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| carbonMoles | Carbon Moles | Required. Finite number. |
| nitrogenMoles | Nitrogen Moles | Required. Finite number. |
| phosphorusMoles | Phosphorus Moles | Required. Finite number. |
| carbonPerPhosphorus | Carbon moles per phosphorus mole, not mass C:P. | Required. Finite number. |
| nitrogenPerPhosphorus | Nitrogen Per Phosphorus | Required. Finite number. |
{
"input": {
"carbonMass": 120,
"nitrogenMass": 28,
"phosphorusMass": 31,
"carbonMolarMass": 12,
"nitrogenMolarMass": 14,
"phosphorusMolarMass": 31
},
"output": {
"carbonMoles": 10,
"nitrogenMoles": 2,
"phosphorusMoles": 1,
"carbonPerPhosphorus": 10,
"nitrogenPerPhosphorus": 2
}
}Limitations and assumptions
- Mass and molar-mass units must be compatible. These are molar rather than mass C:P and N:P ratios, not nutrient limitation diagnosis or a standard stoichiometric classification.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- 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. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use compatible system boundaries and appropriate ecological measurements before inferring efficiency, nutrient limitation or ecosystem condition.
References
Similar or alternative tools
- Nutrient Resorption Mass Loss Correction Term
uncorrectedEfficiency = 1-senescent/green; massCorrectedEfficiency = 1-senescent*massRatio/green.
- Species Area Power One Scale Factor Tool
Reference-normalized species-area power relation using a supplied exponent, returning an expectation without species-count rounding.