Key hydraulic traits control the dynamics of plant dehydration in four contrasting tree species during drought

Tree Physiology, Journal Year: 2023, Volume and Issue: 43(10), P. 1772 - 1783

Published: June 14, 2023

Trees are at risk of mortality during extreme drought, yet our understanding the traits that govern timing drought-induced hydraulic failure remains limited. To address this, we tested SurEau, a trait-based soil-plant-atmosphere model designed to predict dynamics plant dehydration as represented by changes in water potential against those observed potted trees four contrasting species (Pinus halepensis Mill., Populus nigra L., Quercus ilex L. and Cedrus atlantica (Endl.) Manetti ex Carriére) exposed drought. SurEau was parameterized with range allometric traits, soil climatic variables. We found close correspondence between predicted (in MPa) early phase leading stomatal closure, well latter all species. A global model's sensitivity analysis revealed that, for common size (leaf area) volume, time from full hydration closure (Tclose) most strongly controlled leaf osmotic (Pi0) its influence on species, while maximum conductance (gsmax) also contributed Tclose Q. C. atlantica. Dehydration times (Tcav) Pi0, branch residual (gres) Q10a gres three evergreen xylem embolism resistance (P50) influential deciduous P. nigra. Our findings point highly useful predicting status drought suggest adjustments made key potentially beneficial delaying onset trees.

Language: Английский

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Tree Species Are Differently Impacted by Cumulative Drought Stress and Present Higher Growth Synchrony in Dry Places

Frontiers in Forests and Global Change, Journal Year: 2020, Volume and Issue: 3

Published: Nov. 24, 2020

The increase in frequency and intensity of droughts due to climate change might threaten forests under stress levels causing dieback mortality episodes. Thus, deciphering how tree species from within a region respond drought along environmental gradients should help us understand forest vulnerability change. To enlighten contrasting responses dominant species, we reconstructed vegetation activity using Normalized Difference Vegetation Index (NDVI) radial growth tree-ring width series. We studied six three angiosperms ( Fagus sylvatica , Quercus humilis ilex ) gymnosperms Pinus sylvestris nigra halepensis ), inhabiting Mediterranean north-eastern Spain. investigated if reduced resilience increased synchrony after successive (1986, 1989, 2005, 2012): (i) were related cumulative (ii) preceded dry sites as compared wet sites. In 2016, affected Q. P. stands showing lower rates NDVI. No symptoms observed other or F. Hot summer conditions constrained During severe all but drops more marked places. All able recover extreme droughts, albeit displayed than expected values the 2012 drought. Growth was higher sites, differences 2005 This study reveals that sensitivity same is dependent, it contingent on local with effects describe impact increases triggers occurrence events forests.

Language: Английский

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Declines in canopy greenness and tree growth are caused by combined climate extremes during drought-induced dieback

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 813, P. 152666 - 152666

Published: Dec. 27, 2021

Language: Английский

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Contribution of winter precipitation to tree growth persists until the late growing season in the Karakoram of northern Pakistan

Journal of Hydrology, Journal Year: 2022, Volume and Issue: 607, P. 127513 - 127513

Published: Jan. 25, 2022

Language: Английский

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Die-off after an extreme hot drought affects trees with physiological performance constrained by a more stressful abiotic niche

Agricultural and Forest Meteorology, Journal Year: 2025, Volume and Issue: 363, P. 110430 - 110430

Published: Feb. 7, 2025

Language: Английский

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