Atmospheric dryness effects on canopy chlorophyll fluorescence and Gross Primary Production (GPP) in a deciduous forest during heat waves
Abstract
Sun-Induced chlorophyll Fluorescence (SIF) is the most promising remote-sensing proxy of Gross Primary Production (GPP) in terrestrial ecosystems. However, the estimation of GPP using SIF is challenging when plants experience stress, particularly during extreme climatic events whose frequency is projected to increase in the future. Recently, the feasibility of canopy-level active chlorophyll fluorescence measurements (LED-induced chlorophyll fluorescence), which directly measure the apparent fluorescence yield (FyieldLIF), has provided new perspectives on detecting the responses of plants to stress. This study was conducted during the summer 2022 European heat waves in a mixed temperate deciduous broadleaf forest, located in the French Fontainebleau-Barbeau station. Continuous measurements of carbon dioxide (CO2) and energy exchanges, SIF, FyieldLIF, and ancillary environmental variables were acquired. We investigated how heat-wave induced high atmospheric dryness, measured as Vapor Pressure Deficit, affected canopy chlorophyll fluorescence (both SIF and FyieldLIF) and GPP, as well as their relationships. At the half-hourly scale, our results revealed a decrease of the correlation between SIF and GPP (R² decreased from 0.49 to 0.17) at high atmospheric dryness. In contrast, the correlation between FyieldLIF and GPP increased significantly under high atmospheric dryness (R² increased from 0.07 to 0.43). However, at the daily scale, the correlations between SIF and GPP and between FyieldLIF and GPP showed an overall increase compared to the half-hourly scale, suggesting a time-scale-dependent response of these relationships to atmospheric dryness. This study also highlighted FyieldLIF's advantage in detecting plant responses to high atmospheric dryness, and emphasized the potential of canopy-level active chlorophyll fluorescence for assessing the fluorescence-photosynthesis relationship under extreme climatic conditions.
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BibTeX
@article{li2026atmospheric,
title = {{Atmospheric dryness effects on canopy chlorophyll fluorescence and Gross Primary Production (GPP) in a deciduous forest during heat waves}},
author = {Zhaohui Li and Gabriel Hmimina and Gwendal Latouche and Daniel Berveiller and Abderrahmane Ounis and Yves Goulas and Kamel Soudani},
journal = {Remote Sensing of Environment},
year = {2026},
month = oct,
doi = {10.1016/j.rse.2025.115148},
url = {https://hal.science/hal-05836484v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Atmospheric dryness effects on canopy chlorophyll fluorescence and Gross Primary Production (GPP) in a deciduous forest during heat waves
AU - Zhaohui Li
AU - Gabriel Hmimina
AU - Gwendal Latouche
AU - Daniel Berveiller
AU - Abderrahmane Ounis
AU - Yves Goulas
AU - Kamel Soudani
PY - 2026
DA - 2026/10/23
JO - Remote Sensing of Environment
DO - 10.1016/j.rse.2025.115148
UR - https://hal.science/hal-05836484v1
AB - Sun-Induced chlorophyll Fluorescence (SIF) is the most promising remote-sensing proxy of Gross Primary Production (GPP) in terrestrial ecosystems. However, the estimation of GPP using SIF is challenging when plants experience stress, particularly during extreme climatic events whose frequency is projected to increase in the future. Recently, the feasibility of canopy-level active chlorophyll fluorescence measurements (LED-induced chlorophyll fluorescence), which directly measure the apparent fluorescence yield (FyieldLIF), has provided new perspectives on detecting the responses of plants to stress. This study was conducted during the summer 2022 European heat waves in a mixed temperate deciduous broadleaf forest, located in the French Fontainebleau-Barbeau station. Continuous measurements of carbon dioxide (CO2) and energy exchanges, SIF, FyieldLIF, and ancillary environmental variables were acquired. We investigated how heat-wave induced high atmospheric dryness, measured as Vapor Pressure Deficit, affected canopy chlorophyll fluorescence (both SIF and FyieldLIF) and GPP, as well as their relationships. At the half-hourly scale, our results revealed a decrease of the correlation between SIF and GPP (R² decreased from 0.49 to 0.17) at high atmospheric dryness. In contrast, the correlation between FyieldLIF and GPP increased significantly under high atmospheric dryness (R² increased from 0.07 to 0.43). However, at the daily scale, the correlations between SIF and GPP and between FyieldLIF and GPP showed an overall increase compared to the half-hourly scale, suggesting a time-scale-dependent response of these relationships to atmospheric dryness. This study also highlighted FyieldLIF's advantage in detecting plant responses to high atmospheric dryness, and emphasized the potential of canopy-level active chlorophyll fluorescence for assessing the fluorescence-photosynthesis relationship under extreme climatic conditions.
SN - 0034-4257
SN - 1879-0704
ER -