Article (Scientific journals)
Remote Sensing of Instantaneous Drought Stress at Canopy Level Using Sun-Induced Chlorophyll Fluorescence and Canopy Reflectance
De Cannière, Simon; Vereecken, Harry; Defourny, Pierre et al.
2022In Remote Sensing, 14 (11), p. 2642
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Keywords :
isohydricity; light limitation; non-photochemical quenching; photochemical reflectance index; photosynthesis; SIF; soil water availability; vapour pressure deficit; vegetation index; water limitation; Chlorophyll fluorescence; Isohydricity; Light limitations; Non-photochemical quenching; Photochemical reflectance index; Soil water availability; Sun-induced chlorophyll fluorescence; Vapor pressure deficit; Vegetation index; Water limitation; Earth and Planetary Sciences (all); General Earth and Planetary Sciences
Abstract :
[en] Climate change amplifies the intensity and occurrence of dry periods leading to drought stress in vegetation. For monitoring vegetation stresses, sun-induced chlorophyll fluorescence (SIF) observations are a potential game-changer, as the SIF emission is mechanistically coupled to photosynthetic activity. Yet, the benefit of SIF for drought stress monitoring is not yet understood. This paper analyses the impact of drought stress on canopy-scale SIF emission and surface reflectance over a lettuce and mustard stand with continuous field spectrometer measurements. Here, the SIF measurements are linked to the plant’s photosynthetic efficiency, whereas the surface reflectance can be used to monitor the canopy structure. The mustard canopy showed a reduction in the biochemical component of its SIF emission (the fluorescence emission efficiency at 760 nm—ɛ760) as a reaction to drought stress, whereas its structural component (the Fluorescence Correction Vegetation Index— FCVI) barely showed a reaction. The lettuce canopy showed both an increase in the variability of its surface reflectance at a sub-daily scale and a decrease in ɛ760 during a drought stress event. These reactions occurred simultaneously, suggesting that sun-induced chlorophyll fluorescence and reflectance-based indices sensitive to the canopy structure provide complementary information. The intensity of these reactions depend on both the soil water availability and the atmospheric water demand. This paper highlights the potential for SIF from the upcoming FLuorescence EXplorer (FLEX) satellite to provide a unique insight on the plant’s water status. At the same time, data on the canopy reflectance with a sub-daily temporal resolution are a promising additional stress indicator for certain species.
Disciplines :
Environmental sciences & ecology
Earth sciences & physical geography
Author, co-author :
De Cannière, Simon;  Earth and Life Institute, Université Catholique de Louvain, Ottignies-Louvain-la-Neuve, Belgium ; Agrosphere (IBG-3), Institute of Bio-and Geosciences, Forschungszentrum Jülich GmbH, Jülich, Germany
Vereecken, Harry ;  Agrosphere (IBG-3), Institute of Bio-and Geosciences, Forschungszentrum Jülich GmbH, Jülich, Germany
Defourny, Pierre;  Earth and Life Institute, Université Catholique de Louvain, Ottignies-Louvain-la-Neuve, Belgium
Jonard, François  ;  Université de Liège - ULiège > Département de géographie > Earth Observation and Ecosystem Modelling ; Earth and Life Institute, Université Catholique de Louvain, Ottignies-Louvain-la-Neuve, Belgium ; Agrosphere (IBG-3), Institute of Bio-and Geosciences, Forschungszentrum Jülich GmbH, Jülich, Germany
Language :
English
Title :
Remote Sensing of Instantaneous Drought Stress at Canopy Level Using Sun-Induced Chlorophyll Fluorescence and Canopy Reflectance
Publication date :
June 2022
Journal title :
Remote Sensing
eISSN :
2072-4292
Publisher :
MDPI
Volume :
14
Issue :
11
Pages :
2642
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture
Funding text :
Funding: This research has been funded by the Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture (FRIA, Belgium) and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy—EXC 2070—390732324.
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