{
  "abstract": "Sun-induced chlorophyll fluorescence (SIF) offers a promising path to quantify gross primary productivity (GPP) across spatiotemporal scales. Recent studies have demonstrated the applicability of the SIF-based mechanistic light response (qMLR-SIF) model for estimating canopy GPP. However, the inadequate simulation of the key parameter qL (the fraction of open photosystem II reaction centers) restricts the applicability of the qMLR-SIF model. Therefore, we developed a SIF-based qL function to improve the simulation of qL, and thereby to enhance the performance of the qMLR-SIF model. Tower-based datasets collected from 16 sites were utilized to evaluate the improved qMLR-SIF model. Multi-site validation indicated that the improved qMLR-SIF model enhanced the accuracy of canopy GPP estimation for different plant functional types, photosynthetic pathways, and temporal scales. In particular, the improved qMLR-SIF model significantly reduced the underestimation and overestimation of GPP (y-slope = 0.94 to 1.05; y-intercept = -0.94 to 0.74 μmol CO2 m-2 s-1). Threshold analysis showed that environmental stresses decreased model performance, while even in this situation, the improved qMLR-SIF model still outperformed the original model (except for the boreal evergreen needleleaf forests). The advantages of the SIF-based qL function stem from the mechanistic link between SIF and qL and several unique features of SIF. Our findings demonstrate the enhanced applicability of the improved qMLR-SIF model, highlighting its potential for estimating photosynthesis at regional and global scales.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 5,
  "authors": [
    {
      "name": "Yanping Liu"
    },
    {
      "name": "Genxu Wang"
    },
    {
      "name": "Zhaoyong Hu"
    },
    {
      "name": "Arthur Gessler"
    },
    {
      "name": "Shouqin Sun"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/57qh29r0s6v7k.bib",
  "cited_by": 0,
  "doi": "10.31223/x5m80r",
  "fulltext_url": null,
  "id": "57qh29r0s6v7k",
  "issns": [],
  "landing_url": "https://eartharxiv.org/repository/view/15313/",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/legalcode",
  "metadata_licence": null,
  "native_subjects": [
    [
      "bepress",
      "Agriculture"
    ],
    [
      "bepress",
      "Canopy photosynthesis"
    ],
    [
      "bepress",
      "Earth Sciences"
    ],
    [
      "bepress",
      "Fraction of open photosystem II reaction centers (qL)"
    ],
    [
      "bepress",
      "Gross primary productivity (GPP)"
    ],
    [
      "bepress",
      "Physiology"
    ],
    [
      "bepress",
      "Plant Sciences"
    ],
    [
      "bepress",
      "SIF-based mechanistic light response (MLR-SIF) model"
    ],
    [
      "bepress",
      "Sun-induced chlorophyll fluorescence (SIF)"
    ],
    [
      "openalex",
      "2303|Remote Sensing in Agriculture"
    ]
  ],
  "openalex": "W7215064561",
  "pdf_url": "https://eartharxiv.org/repository/object/15313/download/26542/",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/57qh29r0s6v7k.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:39Z",
      "native_id": "15313",
      "source": "eartharxiv",
      "url": "https://eartharxiv.org/repository/view/15313/"
    }
  ],
  "subjects": [
    {
      "field": "biology",
      "origin": "bepress:Plant Sciences",
      "subfield": "plant-biology"
    },
    {
      "field": "earth",
      "origin": "bepress:Earth Sciences",
      "subfield": "general"
    },
    {
      "field": "medicine",
      "origin": "bepress:Physiology",
      "subfield": "physiology"
    }
  ],
  "title": "Multi-site evaluation of an improved SIF-based model for estimating canopy GPP",
  "title_text": "Multi-site evaluation of an improved SIF-based model for estimating canopy GPP",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:39Z",
  "url": "https://research.draconitic.com/paper/57qh29r0s6v7k",
  "venue": "EarthArXiv",
  "versions": []
}