Drought stress; FLEX; Isohydricity; SIF; SMAP; Soil moisture; TROPOMI; Chlorophyll fluorescence; Photosynthetic electron transport; Sun-induced chlorophyll fluorescence; Vapor pressure deficit; Water availability; Soil Science; Geology; Computers in Earth Sciences
Abstract :
[en] Climate change is amplifying the duration, frequency, and intensity of droughts, harming global ecosystems. During droughts, plants can close their stomata to save water, at the expense of a reduced carboxylation rate. When in a carboxylation-limited regime, plants benefit from an increase in water availability, as it increases their photosynthetic rate. The sun-induced chlorophyll fluorescence (SIF) signal, measurable from satellites, is mechanistically linked to this rate. Like canopy photosynthesis, SIF carries an imprint from the available irradiation (PAR) as well as the canopy structure and the efficiency of the photosynthesis at the photosystem level. Normalizing the global TROPOMI SIF observations with TROPOMI reflectance and MODIS Normalised Difference Vegetation Index (NDVI) data, we extracted the fluorescence quantum yield (ϕF), which lab-scale experiments have found to be linked to the photosynthetic electron transport. Plant physiologists have long proved the photosynthetic electron transport to be sensitive to plant water status. Here, the plant water status is controlled by the soil moisture (SM) and the vapour pressure deficit (VPD). Combining data from the TROPOMI, AIRS and SMAP satellite sensors, this study describes how SM and VPD control the ϕF at the global scale. We identify a VPD range (VPD<1.5 kPa) in which the ϕF is mainly controlled by VPD, and another (VPD>1.5 kPa) in which the ϕF is co-regulated by SM and VPD. The precise values of this range, as well as the magnitude of ϕF values, are modulated by the plant isohydricity. To gain a deeper understanding of the link between ϕF and photosynthetic efficiency at large scale, we used the link between ϕF and data on the canopy conductance (Gs), which were calculated using remote sensing data-driven models. A comparison found that the ϕF-Gs relationship at large scale is in line with the ϕF-Gs relationship described in plant-level studies.
De Cannière, S.; Earth and Life Institute, Université catholique de Louvain, Louvain-la-Neuve, Belgium
Baur, M.J.; Department of Geography, University of Cambridge, Cambridge, United Kingdom
Chaparro, D.; Microwaves and Radar Institute, German Aerospace Center (DLR), Wessling, Germany
Jagdhuber, T.; Microwaves and Radar Institute, German Aerospace Center (DLR), Wessling, Germany ; Faculty of Applied Computer Sciences, Institute of Geography, University of Augsburg, Augsburg, Germany
Jonard, François ; Université de Liège - ULiège > Département de géographie ; Agrosphere (IBG-3), Institute of Bio- and Geosciences, Forschungszentrum Jülich GmbH, Jülich, Germany
Language :
English
Title :
Water availability and atmospheric dryness controls on spaceborne sun-induced chlorophyll fluorescence yield
F.R.S.-FNRS - Fonds de la Recherche Scientifique ETH Zürich - Eidgenössische Technische Hochschule Zürich Fundación Ramón Areces FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture
Funding text :
This research was funded by the Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture (FRIA, Belgium). D. Chaparro benefited from the Funcación Ramón Areces postdoctoral grant. We would like to thank Andrea Carminati, Fabian Wankmüller and Peter Lehmann, all from ETH Zurich, for their help and support regarding the soil-plant hydraulic model.This research was funded by the Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture (FRIA, Belgium) . D. Chaparro benefited from the Funcación Ramón Areces postdoctoral grant . We would like to thank Andrea Carminati, Fabian Wankmüller and Peter Lehmann, all from ETH Zurich, for their help and support regarding the soil-plant hydraulic model.
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