Articles | Volume 21, issue 5
https://doi.org/10.5194/bg-21-1259-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-21-1259-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
15 Mar 2024
Research article |
| 15 Mar 2024
| 15 Mar 2024
Data-based investigation of the effects of canopy structure and shadows on chlorophyll fluorescence in a deciduous oak forest
Hamadou Balde
CORRESPONDING AUTHOR
Laboratoire de Météorologie Dynamique, Sorbonne Université, IPSL, CNRS/L'École Polytechnique, 91128 Palaiseau, CEDEX, France
Ecologie Systématique et Evolution, Université Paris-Saclay, CNRS, AgroParisTech, 91190 Gif-sur-Yvette, France
Centre national d'études spatiales (CNES), 18 Av. Edouard Belin, 31400 Toulouse, France
ACRI-ST, 260 Route du Pin Montard, BP 234, 06904 Sophia Antipolis, France
Gabriel Hmimina
Laboratoire de Météorologie Dynamique, Sorbonne Université, IPSL, CNRS/L'École Polytechnique, 91128 Palaiseau, CEDEX, France
Yves Goulas
Laboratoire de Météorologie Dynamique, Sorbonne Université, IPSL, CNRS/L'École Polytechnique, 91128 Palaiseau, CEDEX, France
Gwendal Latouche
Ecologie Systématique et Evolution, Université Paris-Saclay, CNRS, AgroParisTech, 91190 Gif-sur-Yvette, France
Abderrahmane Ounis
Laboratoire de Météorologie Dynamique, Sorbonne Université, IPSL, CNRS/L'École Polytechnique, 91128 Palaiseau, CEDEX, France
Kamel Soudani
Ecologie Systématique et Evolution, Université Paris-Saclay, CNRS, AgroParisTech, 91190 Gif-sur-Yvette, France
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To understand the drivers of GPP and SIF changes and of their links, we examined how SIF and GPP changed at daily and seasonal scales considering canopy structure and abiotic conditions in a deciduous oak forest. The data show that leaf and canopy properties variations, seasonal cycle of PAR, and abiotic factors control not only SIF and GPP changes, but also their links. Further, during the heatwaves in 2022, we noticed that SIF was a proxy of GPP, while VIs were not.
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To understand the drivers of GPP and SIF changes and of their links, we examined how SIF and GPP changed at daily and seasonal scales considering canopy structure and abiotic conditions in a deciduous oak forest. The data show that leaf and canopy properties variations, seasonal cycle of PAR, and abiotic factors control not only SIF and GPP changes, but also their links. Further, during the heatwaves in 2022, we noticed that SIF was a proxy of GPP, while VIs were not.
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Short summary
We show that FyieldLIF was not correlated with SIFy at the diurnal timescale, and the diurnal patterns in SIF and PAR did not match under clear-sky conditions due to canopy structure. Φk was sensitive to canopy structure. RF models show that Φk can be predicted using reflectance in different bands. RF models also show that FyieldLIF was more sensitive to reflectance and radiation than SIF and SIFy, indicating that the combined effect of reflectance bands could hide the SIF physiological trait.
We show that FyieldLIF was not correlated with SIFy at the diurnal timescale, and the diurnal...
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