Title: Non-stomatal processes reduce gross primary productivity in temperate forest ecosystems during severe edaphic drought
Authors: GOURLEZ DE LA MOTTE LOUISBEAUCLAIRE QUENTINHEINESCH BERNARDCUNTZ MATTHIASFOLTÝNOVÁ LENKAŠIGUT LADISLAVKOWALSKA NATALIAMANCA GIOVANNIGODED BALLARIN IGNACIOVINCKE CAROLINEROLAND MARILYNIBROM ALOUSTEAU DENISSIEBICKE LUKASNEIRYINK JOHANLONGDOZ BERNARD
Citation: PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES vol. 375 no. 1810 p. 20190527
Publisher: ROYAL SOC
Publication Year: 2020
JRC N°: JRC119188
ISSN: 0962-8436 (online)
URI: https://publications.jrc.ec.europa.eu/repository/handle/JRC119188
DOI: 10.1098/rstb.2019.0527
Type: Articles in periodicals and books
Abstract: 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 VCMAX (NSOL) when the soil relative extractable water content (REW) 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. This result was unexpected as it implies that NSOL (instead of stomatal closure) was the main process limiting GPP during drought.
JRC Directorate:Energy, Transport and Climate

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