Articles | Volume 23, issue 6
https://doi.org/10.5194/bg-23-2079-2026
https://doi.org/10.5194/bg-23-2079-2026
Research article
 | 
26 Mar 2026
Research article |  | 26 Mar 2026

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

Laura Delhez, Eric Laloy, Quentin Beauclaire, and Bernard Longdoz

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This preprint is open for discussion and under review for Biogeosciences (BG).
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Cited articles

Abrahamsen, P. and Hansen, S.: Daisy: an open soil-crop-atmosphere system model, Environ. Modell. Softw., 15, 313–330, https://doi.org/10.1016/S1364-8152(00)00003-7, 2000. 
Allen, R. G., Pereira, L. S., Raes, D., and Smith, M.: Crop evapotranspiration: Guidelines for computing crop water requirements, edited by: Food and Agriculture Organization of the United Nations, Food and Agriculture Organization of the United Nations, Rome, 300 pp., ISBN 978-92-5-104219-9, 1998. 
Allen, R. G., Pruitt, W. O., Wright, J. L., Howell, T. A., Ventura, F., Snyder, R., Itenfisu, D., Steduto, P., Berengena, J., Yrisarry, J. B., Smith, M., Pereira, L. S., Raes, D., Perrier, A., Alves, I., Walter, I., and Elliott, R.: A recommendation on standardized surface resistance for hourly calculation of reference ETo by the FAO56 Penman-Monteith method, Agr. Water Manage., 81, 1–22, https://doi.org/10.1016/j.agwat.2005.03.007, 2006. 
Amthor, J. S.: After photosynthesis, what then: Importance of respiration to crop growth and yield, Field Crop. Res., 321, 109638, https://doi.org/10.1016/j.fcr.2024.109638, 2025. 
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Using an advanced optimisation method, we calibrated a crop model against dry matter, carbon and water exchanges. Although model predictions matched observations well, the process revealed weaknesses in the model, such as difficulty in representing evapotranspiration, especially during heatwaves. This multi-objective approach highlighted the need to better capture stomatal and non-stomatal responses in order to improve predictions of crop models.
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