Compound soil and atmospheric drought (CSAD) events and CO2 fluxes of a mixed deciduous forest: the occurrence, impact, and temporal contribution of main drivers DOI Creative Commons
Liliana Scapucci, Ankit Shekhar, Sergio Aranda-Barranco

et al.

Biogeosciences, Journal Year: 2024, Volume and Issue: 21(15), P. 3571 - 3592

Published: Aug. 13, 2024

Abstract. With global warming, forests are increasingly exposed to “compound soil and atmospheric drought” (CSAD) events, characterized by low water content (SWC) high vapour pressure deficit (VPD). Such CSAD events trigger responses in both ecosystem forest-floor CO2 fluxes, which we know little about. In this study, used multi-year daily daytime above-canopy (18 years; 2005–2022) (5 2018–2022) eddy covariance fluxes from a Swiss forest site the name of CH-Lae (a mixed deciduous montane forest). The objectives were (1) characterize at CH-Lae, (2) quantify impact on (3) identify major drivers their temporal contributions changing during growing seasons. Our results showed that seasons 2015, 2018, 2022 three driest since 2005 (referred as years), exhibiting similar intensity duration but considerably different pre-drought conditions. reduced mean net productivity (NEP) all 3 years about 38 % compared long-term mean, with highest reduction observed (41 %). This NEP was largely due decreased gross primary (GPP; > 16 below mean) rather than increased respiration (Reco) events. Furthermore, (Rff) 2018 (with no measurements 2015), larger %) (16 %), relative (2019–2021). Using data-driven machine learning methods, identified Rff While (NEPDT) 2015 limited VPD SWC, respectively, NEPDT event strongly SWC VPD. Air temperature had negative effects, while radiation positive effects Daily driven severely event. We found multi-layer analysis is necessary better understand particularly if first signs acclimation – evident our also elsewhere. conclude have multiple contributions, making predictions site-specific such conditions more challenging.

Language: Английский

Linking stomatal size and density to water use efficiency and leaf carbon isotope ratio in juvenile and mature trees DOI Creative Commons
Peter Petrík, Anja Petek, Laurent J. Lamarque

et al.

Physiologia Plantarum, Journal Year: 2024, Volume and Issue: 176(6)

Published: Nov. 1, 2024

Water-use efficiency (WUE) is affected by multiple leaf traits, including stomatal morphology. However, the impact of morphology on WUE across different ontogenetic stages tree species not well-documented. Here, we investigated relationship between morphology, intrinsic water-use (iWUE) and carbon isotope ratio (δ

Language: Английский

Citations

4
Shifts in resource allocation and aggravation of foliage development restrict the growth rate of Picea abies under increasing atmospheric humidity at high latitudes DOI
Arne Sellin, Katrin Heinsoo, Eele Õunapuu-Pikas

et al.

The Science of The Total Environment, Journal Year: 2025, Volume and Issue: 979, P. 179452 - 179452

Published: April 27, 2025

Language: Английский

Citations

0
Variation in xylem vulnerability to cavitation shapes the photosynthetic legacy of drought DOI Creative Commons
Vanessa Tonet, Timothy J. Brodribb, Ibrahim Bourbia

et al.

Plant Cell & Environment, Journal Year: 2023, Volume and Issue: 47(4), P. 1160 - 1170

Published: Dec. 18, 2023

Abstract Increased drought conditions impact tree health, negatively disrupting plant water transport which, in turn, affects growth and survival. Persistent legacy effects have been documented many diverse ecosystems, yet we still lack a mechanistic understanding of the physiological processes limiting recovery after drought. Tackling this question, exposed saplings common Australian evergreen ( Eucalyptus viminalis ) to cycle rewatering, seeking evidence for link between spread xylem cavitation within crown degree photosynthetic postdrought. Individual leaves experiencing >35% vein quickly died but did not translate rapid overall canopy damage. Rather, whole canopies showed gradual decline mean postdrought gas exchange rates as stress increased. This loss function was due significant variation vulnerability leading diversity capacity single recover These results from E. emphasise importance within‐crown central character regulating dynamics death severity through time.

Language: Английский

Citations

10
Post-windthrow differences of carbon and water fluxes between managed and unmanaged Norway spruce stands DOI Creative Commons
Peter Petrík, Peter Fleischer,

Jakub Tomes

et al.

Agricultural and Forest Meteorology, Journal Year: 2024, Volume and Issue: 355, P. 110102 - 110102

Published: June 10, 2024

Language: Английский

Citations

3
Compound soil and atmospheric drought (CSAD) events and CO2 fluxes of a mixed deciduous forest: the occurrence, impact, and temporal contribution of main drivers DOI Creative Commons
Liliana Scapucci, Ankit Shekhar, Sergio Aranda-Barranco

et al.

Biogeosciences, Journal Year: 2024, Volume and Issue: 21(15), P. 3571 - 3592

Published: Aug. 13, 2024

Abstract. With global warming, forests are increasingly exposed to “compound soil and atmospheric drought” (CSAD) events, characterized by low water content (SWC) high vapour pressure deficit (VPD). Such CSAD events trigger responses in both ecosystem forest-floor CO2 fluxes, which we know little about. In this study, used multi-year daily daytime above-canopy (18 years; 2005–2022) (5 2018–2022) eddy covariance fluxes from a Swiss forest site the name of CH-Lae (a mixed deciduous montane forest). The objectives were (1) characterize at CH-Lae, (2) quantify impact on (3) identify major drivers their temporal contributions changing during growing seasons. Our results showed that seasons 2015, 2018, 2022 three driest since 2005 (referred as years), exhibiting similar intensity duration but considerably different pre-drought conditions. reduced mean net productivity (NEP) all 3 years about 38 % compared long-term mean, with highest reduction observed (41 %). This NEP was largely due decreased gross primary (GPP; > 16 below mean) rather than increased respiration (Reco) events. Furthermore, (Rff) 2018 (with no measurements 2015), larger %) (16 %), relative (2019–2021). Using data-driven machine learning methods, identified Rff While (NEPDT) 2015 limited VPD SWC, respectively, NEPDT event strongly SWC VPD. Air temperature had negative effects, while radiation positive effects Daily driven severely event. We found multi-layer analysis is necessary better understand particularly if first signs acclimation – evident our also elsewhere. conclude have multiple contributions, making predictions site-specific such conditions more challenging.

Language: Английский

Citations

0