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August 16, 2026International Journal of Applied Earth Observation and GeoinformationOpen Access

Disentangling leaf physiology and canopy structure effects on solar-induced chlorophyll fluorescence and gross primary productivity: A multi-biome and cross-site assessment

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Authors

FLFangyi LvKSKaimin SunSMShunxia Miao

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Overview

Observational study reveals canopy structure and physiology modulate chlorophyll fluorescence relationships with ecosystem productivity, highlighting biome-specific satellite estimation needs.

Key Points

  • Disentangle the relative contributions of leaf physiology and canopy structure on the relationship between solar-induced chlorophyll fluorescence (SIF) and gross primary productivity (GPP) across diverse biomes.
  • Analyzed combined flux tower observations and GOSIF satellite data across 37 sites covering four biomes: croplands (CRO), grasslands (GRA), evergreen needleleaf forests (ENF), and deciduous broadleaf forests (DBF).
  • Evaluated relationships among light use efficiency (LUE), fluorescence yield (ΦF), and canopy escape ratio across temperature and vapor pressure deficit gradients.
  • Canopy escape ratio strengthened the relationship between ΦF and LUE in CRO, GRA, and ENF, increasing R² by 0.10–0.15 (a 21%–88% relative increase).
  • Correcting observed SIF to total emitted SIF using the escape ratio weakened SIF-GPP correlations.
  • High SIF-GPP correlations for CRO, GRA, and DBF were concentrated in temperature bins above ~9 °C and vapor pressure deficit bins below ~14 hPa.

Cite This Study

Lv et al. (2026) studied this question.

synapsesocial.com/papers/6a817a01f2fb91fc834ad900https://doi.org/10.1016/j.jag.2026.105521
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