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<p>In this study, we have analyzed the solar induced fluorescence (SIF) dynamics in wheat crop, employing the Soil Canopy Observation of Photosynthesis and Energy fluxes (SCOPE) model to simulate passive multi-wavelength SIF. The model was calibrated and validated using field measurements of active fluorescence (Fv/Fm) at different levels of water and nitrogen doses. Crucial input parameters for the simulations were observed in the experimental wheat field at the Indian Agricultural Research Institute. Analysis of SCOPE-simulated SIF resulted a significant positive correlation with Fv/Fm at different growth stages, affirming the reliability of simulated SIF. The seasonal profile of SIF showed the stress induced decrease in the SIF throughout the crop growth, and SIF at far-red (740&#xa0;nm) was more responsive than SIF at red wavelength (684&#xa0;nm). Further, relationships between simulated SIF and environmental parameters showed positive correlations with key factors of LAI, chlorophyll content, leaf nitrogen levels, and APAR. Through different physiological measurements and simulation analyses, valuable insights were gained into the fluorescence behaviour of the spring wheat crop, enhancing our understanding of their responses to environmental stress. Further, the validated SCOPE model can be inverted with multispectral satellite observations to regularly generate crop SIF maps for stress monitoring at regional scales.</p>

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Simulations of Sun-Induced Fluorescence in Wheat Under Water and Nitrogen Levels Using SCOPE Radiative Transfer Model

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Shreya Gupta,
  • Vinay Kumar Sehgal,
  • Rajkumar Dhakar,
  • Rakesh Pandey,
  • Joydeep Mukherjee,
  • Karun Kumar Choudhary,
  • Niveta Jain,
  • Koushik Bag,
  • Dipankar Barman

摘要

In this study, we have analyzed the solar induced fluorescence (SIF) dynamics in wheat crop, employing the Soil Canopy Observation of Photosynthesis and Energy fluxes (SCOPE) model to simulate passive multi-wavelength SIF. The model was calibrated and validated using field measurements of active fluorescence (Fv/Fm) at different levels of water and nitrogen doses. Crucial input parameters for the simulations were observed in the experimental wheat field at the Indian Agricultural Research Institute. Analysis of SCOPE-simulated SIF resulted a significant positive correlation with Fv/Fm at different growth stages, affirming the reliability of simulated SIF. The seasonal profile of SIF showed the stress induced decrease in the SIF throughout the crop growth, and SIF at far-red (740 nm) was more responsive than SIF at red wavelength (684 nm). Further, relationships between simulated SIF and environmental parameters showed positive correlations with key factors of LAI, chlorophyll content, leaf nitrogen levels, and APAR. Through different physiological measurements and simulation analyses, valuable insights were gained into the fluorescence behaviour of the spring wheat crop, enhancing our understanding of their responses to environmental stress. Further, the validated SCOPE model can be inverted with multispectral satellite observations to regularly generate crop SIF maps for stress monitoring at regional scales.