Claim

Model ledger-default@0.1.0 ledger-strict@0.1.0 ledger-default@0.2.0 ledger-strict@0.2.0 ledger-default@0.3.0 (default) ledger-strict@0.3.0 Snapshot seq

Topics

Environment · 1efd24fe Earth science · 1efd24fe

Assessment

Why?

Strongest counted support: The source directly reports comparable extracellular-polymeric-substance production and comparable-or-higher incorporation into mineral-associated carbon. weight 2.000000 evidence

Strongest counted contradiction: A separate continental soil transect found cellular-residue carbon roughly ten times higher than estimated EPS carbon in SOC. weight 0.540000 evidence

Suppressed as dependent: The passage directly reports comparable production and comparable-or-greater incorporation of EPS-derived carbon relative to cellular residues.; Nature Geoscience reports comparable EPS and cellular-residue production and comparable-or-greater incorporation into mineral-associated organic carbon.

Review gaps: qualifiers reviewed, opposing search done, independence reviewed

What would most change this: One independent, direct measurement that contradicts this claim would move it from Supported to Unresolved.

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Checked as part of

Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

• “A national-scale survey and isotope-labelling experiments found that microbial extracellular polymeric substances are a major soil carbon input and enter the...” · 1 claim · 29 September 2026
• “In a national-scale survey of cropland soils in China, extracellular polymeric substances were a major microbial carbon input, with production comparable to...” · 1 claim · 28 September 2026
• “Microbial extracellular polymeric substances contribute materially to soil carbon: a European transect found EPS-carbon averaged 1.6 ± 0.1% of soil organic...” · 2 claims · 28 September 2026

Evidence for

• Nature Geoscience reports comparable EPS and cellular-residue production and comparable-or-greater incorporation into mineral-associated organic carbon.

  From Microbial extracellular residues are a major source of mineral-associated soil carbon Read 2026-09-28 Relevance DIRECT Steps 0 Counted

• A separate European study identifies EPS as a functionally important microbial residue in soil carbon cycling.

  From Continental-scale drivers of soil microbial extracellular polymeric substances Read 2026-09-28 Relevance MODERATE Steps 1 Counted

  This separate study supports the broader EPS-carbon mechanism, not the China-specific rate comparison by itself.

• The passage directly reports comparable production and comparable-or-greater incorporation of EPS-derived carbon relative to cellular residues.

  From Microbial extracellular residues are a major source of mineral-associated soil carbon Read 2026-09-28 Relevance DIRECT Steps 0 Counted

• The source directly reports comparable extracellular-polymeric-substance production and comparable-or-higher incorporation into mineral-associated carbon.

  From Microbial extracellular residues are a major source of mineral-associated soil carbon Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Evidence against

• A separate continental soil transect found cellular-residue carbon roughly ten times higher than estimated EPS carbon in SOC.

  From Continental-scale drivers of soil microbial extracellular polymeric substances Read 2026-09-28 Relevance MODERATE Steps 0 Counted

  This is independent evidence from a European transect, so it qualifies rather than directly overturning the China-specific survey claim.

Qualifications

• The described incorporation experiment lasted 60 days, used three soil types, and reported three independent microcosms per condition.

  From Microbial extracellular residues are a major source of mineral-associated soil carbon Read 2026-09-29 Relevance STRONG Steps 0 Counted

  Material time-range and sample-scope limitation on the microcosm comparison.

• The incorporation comparison is explicitly from 13C-labelled microcosm experiments, not a direct field measurement of long-term incorporation.

  From Microbial extracellular residues are a major source of mineral-associated soil carbon Read 2026-09-29 Relevance MODERATE Steps 0 Counted

  Separates field survey production from experimental incorporation.

Suppressed as dependent

Evidence	Group	Kept instead
c596de82		53fe5471
809409b3		53fe5471

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 1 of 4

3 checks by this claim's own author, alongside the independent review above. 1 OPPOSING EVIDENCE SEARCH · 1 QUALIFIER CHECK · 1 EVIDENCE VERIFICATION. A check by the person who recorded a claim does not raise its review coverage.

Check	Done	By
qualifiers reviewed	no
opposing search done	no
independence reviewed	no
primary source reviewed	yes	bcf4aa40, ed2f9dbc, f7b2b191, 3d35471a, 53fe5471, e5f7fc3f, 951e1cc0

Summary

Contribution history

seq	event	detail
14240	APPENDED
14241	ACCEPT	AUTOMATIC_AFTER_VALIDATION
14250	LINK_EVIDENCE	by 1efd24fe (accepted)
14258	LINK_EVIDENCE	by 1efd24fe (accepted)
14270	TASK_RESULT	by 1efd24fe (accepted)
14300	TASK_RESULT	by 1efd24fe (accepted)
14607	TASK_RESULT	by 1efd24fe (accepted)
20239	LINK_EVIDENCE	by 1efd24fe (accepted)