Soil bulk density
Measurement answer
What this metric measures
Reports soil bulk density as the mass of dry soil divided by its total volume, as an indicator of soil compaction.
Specification
Metric specification
- Result format
- Single value
- Unit
- g/cm³ — source-defined reporting unit
- Reporting basis
- Reporting period for which soil condition is assessed
- Aggregation
- Reported bulk density for each disclosed soil sampling location, soil layer or other stated assessment unit
- Pillar
- Environmental
- Topic
- State of nature: ecosystem condition
- Controlled domain
- Nature, biodiversity and land
- Entity type
- Metric
Reporting boundary
Soils within the reporting organization's disclosed assessment boundary
Verified source occurrences
Framework coverage
This is one canonical metric. The bindings below show every verified framework occurrence without creating duplicate metric pages. Edition, disclosure, role, and relationship remain source-specific.
- Adopting DisclosureSource evidence
TNFD sector guidance
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Final English sector guidance collection through August 2026 (17 documents)
- Requirement
- Not Specified
- Relationship
- Defines Disclosure
- Mapping outcome
- Direct Evidence
- Source locator
- Food and agriculture Version 1.0 (June 2024), p. 78, Additional sector metrics table; State of nature: Ecosystem condition
- Adopting DisclosureFA.A5.6
TNFD sector guidance
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Version 1.0, June 2024
- Requirement
- Recommended
- Relationship
- Maps Source Identity
- Mapping outcome
- Published
- Source locator
- Food and agriculture Version 1.0 (June 2024), p. 78, Additional sector metrics table; State of nature: Ecosystem condition
Value structure
Dimensions and units
- Unit
- g/cm³ — source-defined reporting unit
- Reporting basis
- Reporting period for which soil condition is assessed
Unit meaning: Values use g/cm³ under the disclosed TNFD sector-guidance method, reporting period and boundary.
Published dimensions
- soil sampling location or assessment unit
- soil depth or layer where assessed
- ecosystem or land-use context where disclosed
- value-chain or operational boundary where disclosed
Calculation method
Formula information
- Status
- Specified
- Formula type
- Ratio
Formula
BD = M_dry / V_totalApply the source-defined TNFD sector-guidance method within the stated reporting boundary. The Food and agriculture additional sector metric explicitly defines soil compaction through a reportable bulk-density outcome and provides both the measurement construct and unit. It is not an emissions-to-soil construct and does not match any shortlisted existing metric.
Variables
| Symbol | Variable | Definition | Unit |
|---|---|---|---|
BD | soil bulk density | Bulk density used to assess soil compaction. | g/cm³ |
M_dry | dry soil mass | Mass of soil after drying. | g |
V_total | total soil volume | Total volume occupied by the soil sample. | cm³ |
Verified sources
Evidence and status sources
Sustopedia checked each record-specific claim directly against primary publisher material. Labels distinguish current measurement authority from future compatibility and corroborative, legal, edition, or method status context. Corroborative evidence can support a stated limitation but cannot establish the core measurement by itself.
Measurement evidence
- Measurement evidenceChecked 30 August 2026
TNFD additional sector guidance collection
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Final English sector guidance collection through August 2026 (17 documents)
- Locator
- Food and agriculture Version 1.0 (June 2024), p. 78, Additional sector metrics table; State of nature: Ecosystem condition
Supports: The official TNFD sector guidance supports the identity, boundary and method basis of “Soil bulk density”.
Open official source
Use with context
Interpretation boundaries
Method disclosures required
Source-edition basis: TNFD sector guidance, Final English sector guidance collection through August 2026 (17 documents).
- Disclose the dry-soil mass measurement method.
- Disclose the total soil-volume measurement method.
- Disclose soil sampling locations or assessment units and sampling depth or layer.
- Disclose the organizational, operational and geographic boundary assessed.
- Disclose the aggregation approach where more than one sample is reported.
Record-specific limitations
- Bulk density is an indicator used to assess soil compaction and is not, by itself, a complete description of soil condition.
- Comparability depends on disclosed sampling depth, soil moisture handling, sampling method and spatial aggregation.
- The extracted specification does not prescribe a common sampling design, depth, geographic boundary or aggregation method.
Interpret this metric with the stated reporting boundary, period convention, value shape, and unit. Results prepared with different boundaries or conventions may not be directly comparable.
Measurement evidence supports the core record-specific claims described above. Corroborative evidence can support limitations, while compatibility and status sources provide their separately labelled context. None of these cards by itself determines an organisation's legal applicability, filing readiness, assurance status, or compliance conclusion.