Li et al. (2025) Evaluating the Performance of the STEMMUS-SCOPE Model to Simulate SIF and GPP Under Drought Stress Using Tower-Based Observations of Maize

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Identification

• Journal: Remote Sensing
• Year: 2025
• Date: 2025-12-05
• Authors: M. Li, Xinjie Liu, Liangyun Liu
• DOI: 10.3390/rs17243931

Research Groups

Not explicitly available in the provided text.

Short Summary

This study simulated solar-induced fluorescence (SIF) and gross primary productivity (GPP) using the STEMMUS-SCOPE model at a semi-arid irrigated farmland to assess its accuracy and capability in analyzing water stress impacts. The STEMMUS-SCOPE model demonstrated higher accuracy than the SCOPE model, particularly under drought conditions, and reliably characterized the SIF-GPP relationship under water stress.

Objective

• To assess the accuracy of the STEMMUS-SCOPE model in simulating solar-induced fluorescence (SIF) and gross primary productivity (GPP) under drought stress, and its capability to quantitatively analyze the impacts of water stress on these variables.

Study Configuration

• Spatial Scale: Daman site (semi-arid irrigated farmland).
• Temporal Scale: Half-hour scales from 2017 to 2023.

Methodology and Data

• Models used: STEMMUS-SCOPE, SCOPE.
• Data sources: Flux tower observations, irrigation events.

Main Results

• The STEMMUS-SCOPE model showed higher accuracy in simulating SIF and GPP compared to the SCOPE model.
• For SIF, the averaged R² and root mean square error (RMSE) between STEMMUS-SCOPE simulations and observations were 0.66 and 0.29 mW m⁻² nm⁻¹, respectively.
• For GPP, the averaged R² and RMSE between STEMMUS-SCOPE simulations and observations were 0.88 and 4.93 µmol CO₂ m⁻² s⁻¹, respectively, for the period 2017-2023.
• Under relatively drought conditions, the R² values improved significantly: SIF R² was 0.84, and GPP R² was 0.96.
• The response of STEMMUS-SCOPE simulations under water stress, when combined with soil moisture content (SMC) and canopy conductance (Gs) analyses, was consistent with previous findings on water deficit impacts, confirming the model’s reliability for drought conditions.
• Under drought stress, the decline in fluorescence emission efficiency (ΦF) with decreasing Gs and SMC was smaller than that of the light use efficiency (LUE).

Contributions

• Demonstrates the superior accuracy of the STEMMUS-SCOPE model over the SCOPE model for simulating SIF and GPP, especially under drought conditions.
• Confirms the reliability of the STEMMUS-SCOPE model for quantitatively analyzing the impacts of water stress on SIF and GPP.
• Provides a promising tool for investigating the SIF–GPP relationship under drought stress, highlighting differential responses of ΦF and LUE.

Funding

Not explicitly available in the provided text.

Citation

@article{Li2025Evaluating,
  author = {Li, M. and Liu, Xinjie and Liu, Liangyun},
  title = {Evaluating the Performance of the STEMMUS-SCOPE Model to Simulate SIF and GPP Under Drought Stress Using Tower-Based Observations of Maize},
  journal = {Remote Sensing},
  year = {2025},
  doi = {10.3390/rs17243931},
  url = {https://doi.org/10.3390/rs17243931}
}

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