Interpreting carbon-water trade-offs in Daisy crop model using Pareto-based calibration

[en] Abstract. Improving the simulation of carbon and water exchanges is crucial for reliable crop modelling under changing climate conditions. Although model calibration is a key step, optimising multiple outputs can be challenging and often reveals trade-offs between calibration objectives. We applied a Pareto-based multi-objective calibration with the Speed-constrained Multi-objective Particle Swarm Optimisation (SMPSO) algorithm to the Daisy soil–plant–atmosphere model, targeting dry matter (DM), net ecosystem exchange (NEE) and latent heat flux (LE) of winter wheat crops. The optimal parameter set provided satisfactory results for all objectives (RMSE =0.948 t ha−1 for DM, 1.49 gC m−2 d−1 for daily NEE and 30.7 W m−2 for daily LE) but revealed singular trade-offs. The strong compromise between dry matter and NEE likely suggests wrong parameterisation and/or measurement bias, while the trade-off between NEE and LE reflects equifinality issues from evapotranspiration partitioning. Lastly, this analysis also highlighted limitations in simulating stomatal regulation during heatwave conditions, supporting the decoupling between transpiration and carbon assimilation. These findings show that Pareto-based calibration can also serve as a diagnostic tool, identifying structural weaknesses and guiding targeted improvements in process representation for more robust crop model evaluation.

Disciplines :

Environmental sciences & ecology

Author, co-author :

Delhez, Laura ; Université de Liège - ULiège > Département GxABT > Biosystems Dynamics and Exchanges (BIODYNE)

Laloy, Eric

Beauclaire, Quentin ; Université de Liège - ULiège > Département GxABT > Biosystems Dynamics and Exchanges (BIODYNE)

Longdoz, Bernard ; Université de Liège - ULiège > TERRA Research Centre > Biosystems Dynamics and Exchanges (BIODYNE)

Language :

English

Title :

Interpreting carbon-water trade-offs in Daisy crop model using Pareto-based calibration

Publication date :

26 March 2026

Journal title :

Biogeosciences

ISSN :

1726-4170

eISSN :

1726-4189

Publisher :

Copernicus GmbH

Volume :

Issue :

Pages :

2079-2099

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://bg.copernicus.org/articles/23/2079/2026/bg-23-2079-2026.pdf

Data Set :

https://doi.org/10.18160/46P3-WT1D

Available on ORBi :

since 26 March 2026

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