{
  "id": "ark:/99999/dp-marcescence-decomposition.v2",
  "concept": "ark:/99999/dp-marcescence-decomposition",
  "url": "https://datasetpapers.com/papers/plant-ecology-marcescence-decomposition/",
  "title": "Marcescent plant litter decomposes more slowly than shed litter, and the slow-down is concentrated in forbs",
  "source_dataset": {
    "title": "Angst et al. 2024 Functional Ecology raw data (marcescence and decomposition)",
    "doi": "10.6084/m9.figshare.25062800",
    "license": "CC-BY-4.0"
  },
  "verification": {
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    "reproduced": true,
    "ran_at": "2026-07-07T20:14:32Z",
    "record": "verification.json"
  },
  "gate": {
    "passed": true,
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    "novelty_grade": "B",
    "failed": []
  },
  "claims": [
    {
      "id": "ark:/99999/dp-marcescence-decomposition.v2/claim-1",
      "n": 1,
      "triple": {
        "subject": "marcescent (persistent standing-dead) plant litter",
        "predicate": "decomposes more slowly than",
        "object": "directly shed litter across herbaceous species"
      },
      "assertion_text": "Across 34 herbaceous species, marcescent litter lost less mass than shed litter (species-level mean 38.5% vs 56.6%; paired Wilcoxon signed-rank z = -4.49, p < 0.001, matched-pairs rank-biserial r = 0.77), decomposing more slowly in 30 of 34 species The mean marcescent-minus-shed mass-loss difference is -18.0 percentage points (95% bootstrap CI [-23.9, -12.4]).",
      "novelty_grade": "B",
      "mode": "confirmatory",
      "confidence": 0.95,
      "self_reported_status": "re_executed",
      "independent_reexecution": "matched",
      "entities": [
        {
          "label": "litter functional group",
          "values": [
            "Forb",
            "Grass",
            "Legume"
          ],
          "id": null,
          "iri": null,
          "ontology": null,
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        },
        {
          "label": "decomposition mass loss",
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        },
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      ]
    },
    {
      "id": "ark:/99999/dp-marcescence-decomposition.v2/claim-2",
      "n": 2,
      "triple": {
        "subject": "the marcescent-versus-shed decomposition difference",
        "predicate": "depends on plant functional group",
        "object": "being far larger in forbs than in grasses"
      },
      "assertion_text": "The per-species (marcescent - shed) mass-loss difference was -23.1 percentage points in forbs versus -2.2 in grasses (Mann-Whitney U = 18, p = 0.0007; Benjamini-Hochberg adjusted 0.001), so the marcescence effect is functional-group dependent.",
      "novelty_grade": "B",
      "mode": "confirmatory",
      "confidence": 0.9,
      "self_reported_status": "re_executed",
      "independent_reexecution": "matched",
      "entities": [
        {
          "label": "litter functional group",
          "values": [
            "Forb",
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          ],
          "id": null,
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          "verified": false
        },
        {
          "label": "decomposition mass loss",
          "role": "response",
          "id": "ENVO:01000840",
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      ],
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        },
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        },
        {
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    {
      "id": "ark:/99999/dp-marcescence-decomposition.v2/claim-3",
      "n": 3,
      "triple": {
        "subject": "the marcescent decomposition slow-down",
        "predicate": "is significant within forbs but not within grasses",
        "object": "at the species level"
      },
      "assertion_text": "Within-group paired Wilcoxon tests give p = 0.0001 for forbs (BH-adjusted 0.0002) but p = 0.24 for grasses (non-significant), consistent with the functional-group interaction; the grass result is under-powered (n = 7) rather than a demonstrated null.",
      "novelty_grade": "B",
      "mode": "confirmatory",
      "confidence": 0.85,
      "self_reported_status": "re_executed",
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      "entities": [
        {
          "label": "litter functional group",
          "values": [
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          "id": null,
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        },
        {
          "label": "decomposition mass loss",
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    {
      "id": "ark:/99999/dp-marcescence-decomposition.v2/claim-4",
      "n": 4,
      "triple": {
        "subject": "microbial biomass on the litter (Cmic)",
        "predicate": "is positively associated with",
        "object": "litter decomposition (percent mass loss)"
      },
      "assertion_text": "Microbial biomass was positively correlated with mass loss (Spearman rho = 0.43, p < 0.001, n = 58; Benjamini-Hochberg adjusted 0.001), an observational association that cannot separate microbial cause from litter-quality confounds.",
      "novelty_grade": "C",
      "mode": "exploratory",
      "confidence": 0.75,
      "self_reported_status": "re_executed",
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      "entities": [
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