Non-stomatal processes reduce gross primary productivity in temperate forest ecosystems during severe edaphic drought
2020
Gourlez de La Motte, Louis | Beauclaire, Quentin | Heinesch, Bernard | Cuntz, Mathias | Foltýnová, Lenka | Šigut, Ladislav | Kowalska, Natalia | Manca, Giovanni | Ballarin, Ignacio Goded | Vincke, Caroline | Roland, Marilyn | Ibrom, Andreas | Lousteau, Denis | Siebicke, Lukas | Neiryink, Johan | Longdoz, Bernard | Gembloux Agro-Bio Tech [Faculté universitaire des sciences agronomiques de Gembloux] ([FUSAGx]) ; Université de Liège = University of Liège = Universiteit van Luik = Universität Lüttich (ULiège) | SILVA (SILVA) ; AgroParisTech-Université de Lorraine (UL)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Global Change Research Centre (CzechGlobe) | European Commission - Joint Research Centre [Ispra] (JRC) | Université Catholique de Louvain = Catholic University of Louvain (UCL) | Universiteit Antwerpen = University of Antwerp | Danmarks Tekniske Universitet = Technical University of Denmark (DTU) | Interactions Sol Plante Atmosphère (UMR ISPA) ; Ecole Nationale Supérieure des Sciences Agronomiques de Bordeaux-Aquitaine (Bordeaux Sciences Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Georg-August-University of Göttingen = Georg-August-Universität Göttingen | Research Institute for Nature and Forest (INBO) | FWO Service Public de Wallonie 1217769project 'SustES -Adaptation strategies for sustainable ecosystem services and food security under adverse environmental conditions' CZ.02.1.01/0.0/0.0/16_019/0000797University of Goettingen German Research Foundation (DFG) Federal Ministry of Education & Research (BMBF) Technical University of Denmark (DTU) Det Frie Forskningsrad (DFF)DFF -1323-00182Danish Ministry of Higher Education and Science 5072-00008BEU research infrastructure project RINGO EU research infrastructure project ICOS INRA
International audience
Mostrar más [+] Menos [-]Inglés. Severe drought events are known to cause important reductions of gross primary productivity (GPP) in forest ecosystems. However, it is still unclear whether this reduction originates from stomatal closure (Stomatal Origin Limitation) and/or non-stomatal limitations (Non-SOL). In this study, we investigated the impact of edaphic drought in 2018 onGPPand its origin (SOL, NSOL) using a dataset of 10 European forest ecosystem flux towers. In all stations whereGPPreductions were observed during the drought, these were largely explained by declines in the maximum apparent canopy scale carboxylation rateV(CMAX,APP)(NSOL) when the soil relative extractable water content dropped below around 0.4. Concurrently, we found that the stomatal slope parameter (G(1), related to SOL) of the Medlynet al. unified optimization model linking vegetation conductance andGPPremained relatively constant. These results strengthen the increasing evidence that NSOL should be included in stomatal conductance/photosynthesis models to faithfully simulate bothGPPand water fluxes in forest ecosystems during severe drought. This article is part of the theme issue 'Impacts of the 2018 severe drought and heatwave in Europe: from site to continental scale'.
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