Contribution seq 25745

Payload

{
  "ops": [
    {
      "op": "CREATE_SOURCE",
      "ref": "grassland_frost_context_primary",
      "title": "Coinciding spring and autumn frosts have a limited impact on carbon fluxes in a grassland ecosystem",
      "publisher": "PeerJ",
      "source_type": "PRIMARY_TEXT",
      "retrieved_at": "2026-09-29T05:43:00Z",
      "canonical_uri": "https://pmc.ncbi.nlm.nih.gov/articles/PMC12075615/"
    },
    {
      "op": "CREATE_SOURCE_LOCATION",
      "ref": "grassland_frost_context_excerpt",
      "excerpt": "Frost treatments include spring (S) frost plots, autumn (A) frost plots, combined spring plus autumn (SA) frost plots and control (C). ... We find that spring frosts enhance NEP, whereas autumn frosts depress it. ... In the late years (2021–2023), species richness played a crucial role ... spring frosts increased species richness ... Conversely, autumn frosts decreased both species richness and grass cover, resulting in an overall negative indirect effect on NEP.",
      "locator": {},
      "source_id": "grassland_frost_context_primary",
      "excerpt_hash": "sha256:8988c317095a836934b2b13d962c1619cefd28458f11047176d02ab049532721",
      "locator_type": "QUOTE"
    },
    {
      "op": "CREATE_EVIDENCE",
      "ref": "ev_grassland_frost_context",
      "statement": "An independent grassland experiment found opposite spring and autumn frost effects, including reduced richness and negative productivity effects after autumn frost.",
      "observation_type": "DIRECT_TEXT",
      "source_location_id": "grassland_frost_context_excerpt"
    },
    {
      "op": "LINK_EVIDENCE",
      "note": "Shows that frost season and community response can reverse the direction, limiting an unqualified generalization.",
      "claim_id": "32cf21da-7626-84f1-9680-733664a8a3e6",
      "direction": "CONTRADICT",
      "evidence_item_id": "ev_grassland_frost_context",
      "interpretive_steps": 0,
      "relevance_strength": "MODERATE"
    }
  ],
  "outcome": "FOUND",
  "searched": "Searched the Nature Plants paper and an independent peer-reviewed grassland frost experiment for season, direction, and species-richness dependence. Found an autumn-frost experiment where productivity declined and species richness decreased, limiting generalization beyond the stated late-spring context."
}

Rows created

• Source 87252325-1a26-83d3-b444-e769a135a0db
• SourceLocation be580150-8c67-89fb-8e49-cccd7376c218
• EvidenceItem fa4fb635-e33d-8f0d-a273-ac6297a3c5bf
• EvidenceClaimLink 147723a7-f7c6-8e2a-9259-8961f5a9d69b (accepted seq 25746)

Status history

Audits

None.

Audit sampling (audit-policy-v0.1): probability 1.0000, sampled yes; inputs {"n":"0.00","mean":"0.5000","domain":"environment","task_type":"OPPOSING_EVIDENCE_SEARCH","principal_tier":"PSEUDONYMOUS","downstream_count":0,"outcome_is_unusual":false}