Use este identificador para citar ou linkar para este item: https://repositorio.inpa.gov.br/handle/1/15594
Título: Dry and hot: The hydraulic consequences of a climate change–type drought for Amazonian trees
Autor: Fontes, Clarissa Gouveia
Dawson, Todd E.
Jardine, Kolby J.
McDowell, Nathan G.
Gimenez, Bruno Oliva
Anderegg, Leander D.L.
Negrón-Juárez, Robinson I.
Higuchi, Niro
Van Antwerp Fine, Paul
Araüjo, Alessandro Carioca de
Chambers, Jeffrey Quintin
Palavras-chave: Climate Change
Drought Stress
El Nino-southern Oscillation
High Temperature
Hydraulic Conductivity
Leaf
Metabolism
Mortality
Physiological Response
Rainforest
Soil Water
Xylem
Amazonia
Biomechanics
Climate Change
Drought
Forest
Growth, Development And Aging
Heat
Physiology
Plant Leaf
Season
Species Difference
Tree
Xylem
Biomechanical Phenomena
Climate Change
Droughts
Forests
Hot Temperature
Plant Leaves
Seasons
Species Specificity
Trees
Xylem
Data do documento: 2018
Revista: Philosophical Transactions of the Royal Society B: Biological Sciences
É parte de: Volume 373, Número 1760
Abstract: How plants respond physiologically to leaf warming and low water availability may determine how they will perform under future climate change. In 2015 – 2016, an unprecedented drought occurred across Amazonia with record-breaking high temperatures and low soil moisture, offering a unique opportunity to evaluate the performances of Amazonian trees to a severe climatic event. We quantified the responses of leaf water potential, sap velocity, whole-tree hydraulic conductance (Kwt), turgor loss and xylem embolism, during and after the 2015 – 2016 El Niño for five canopy-tree species. Leaf/xylem safety margins (SMs), sap velocity and Kwt showed a sharp drop during warm periods. SMs were negatively correlated with vapour pressure deficit, but had no significant relationship with soil water storage. Based on our calculations of canopy stomatal and xylem resistances, the decrease in sap velocity and Kwt was due to a combination of xylem cavitation and stomatal closure. Our results suggest that warm droughts greatly amplify the degree of trees’ physiological stress and can lead to mortality. Given the extreme nature of the 2015 – 2016 El Niño and that temperatures are predicted to increase, this work can serve as a case study of the possible impact climate warming can have on tropical trees. This article is part of a discussion meeting issue ‘The impact of the 2015/2016 El Niño on the terrestrial tropical carbon cycle: patterns, mechanisms and implications’. © 2018 The Author(s) Published by the Royal Society. All rights reserved.
DOI: 10.1098/rstb.2018.0209
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