Article (Scientific journals)
Non-stomatal processes reduce gross primary productivity in temperate forest ecosystems during severe edaphic drought
Gourlez de la Motte, Louis; Beauclaire, Quentin; Heinesch, Bernard et al.
2020In Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences, 375 (1810)
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Keywords :
drought; model; forest; photosynthesis; eddy covariance
Abstract :
[en] 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 on GPP and its origin (SOL, NSOL) using a data set of 10 European forest ecosystem flux towers. In all stations where GPP reductions were observed during the drought, these were largely explained by declines in the maximum apparent canopy scale carboxylation rate VCMAX,APP (NSOL) when the soil relative extractable water content dropped below around 0.4. Concurrently, we found that the stomatal slope parameter (G1, related to SOL) of the Medlyn et al. unified optimization model linking vegetation conductance and GPP remained relatively constant. These results strengthen the increasing evidence that NSOL should be included in stomatal conductance/photosynthesis models to faithfully simulate both GPP and water fluxes in forest ecosystems during severe drought.
Disciplines :
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
Gourlez de la Motte, Louis ;  Université de Liège - ULiège > Département GxABT > Plant Sciences
Beauclaire, Quentin  ;  Université de Liège - ULiège > Département GxABT > Biosystems Dynamics and Exchanges
Heinesch, Bernard  ;  Université de Liège - ULiège > Département GxABT > Biosystems Dynamics and Exchanges
Cuntz, Mathias
Foltýnová, Lenka
Sigut, Ladislav
Kowalska, Natalia
Manca, Giovanni
Goded Ballarin, Ignacio
Vincke, Caroline
Roland, Marylin
Ibrom, Andreas
Lousteau, Denis
Sienicke, Lukas
Longdoz, Bernard  ;  Université de Liège - ULiège > Département GxABT > Biosystems Dynamics and Exchanges
More authors (5 more) Less
Language :
English
Title :
Non-stomatal processes reduce gross primary productivity in temperate forest ecosystems during severe edaphic drought
Publication date :
2020
Journal title :
Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
ISSN :
0962-8436
eISSN :
1471-2970
Publisher :
The Royal Society, London, United Kingdom
Volume :
375
Issue :
1810
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 11 March 2020

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