Basin-wide variation in tree hydraulic safety margins predicts the carbon balance of Amazon forests
In: ISSN: 0028-0836, 2023
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academicJournal
Zugriff:
International audience ; Tropical forests face increasing climate risk1,2, yet our ability to predict their response to climate change is limited by poor understanding of their resistance to water stress. Although xylem embolism resistance thresholds (for example, Ψ50) and hydraulic safety margins (for example, HSM50) are important predictors of drought-induced mortality risk3,4,5, little is known about how these vary across Earth’s largest tropical forest. Here, we present a pan-Amazon, fully standardized hydraulic traits dataset and use it to assess regional variation in drought sensitivity and hydraulic trait ability to predict species distributions and long-term forest biomass accumulation. Parameters Ψ50 and HSM50 vary markedly across the Amazon and are related to average long-term rainfall characteristics. Both Ψ50 and HSM50 influence the biogeographical distribution of Amazon tree species. However, HSM50 was the only significant predictor of observed decadal-scale changes in forest biomass. Old-growth forests with wide HSM50 are gaining more biomass than are low HSM50 forests. We propose that this may be associated with a growth–mortality trade-off whereby trees in forests consisting of fast-growing species take greater hydraulic risks and face greater mortality risk. Moreover, in regions of more pronounced climatic change, we find evidence that forests are losing biomass, suggesting that species in these regions may be operating beyond their hydraulic limits. Continued climate change is likely to further reduce HSM50 in the Amazon6,7, with strong implications for the Amazon carbon sink.
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Basin-wide variation in tree hydraulic safety margins predicts the carbon balance of Amazon forests
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Autor/in / Beteiligte Person: | Tavares, Julia Valentim ; Oliveira, Rafael ; Mencuccini, Maurizio ; Signori-Müller, Caroline ; Pereira, Luciano ; Diniz, Francisco Carvalho ; Gilpin, Martin ; Marca Zevallos, Manuel ; Salas Yupayccana, Carlos ; Acosta, Martin ; Pérez Mullisaca, Flor ; Barros, Fernanda de V. ; Bittencourt, Paulo ; Jancoski, Halina ; Scalon, Marina Corrêa ; Marimon, Beatriz ; Oliveras Menor, Imma ; Marimon, Ben Hur ; Fancourt, Max ; Chambers-Ostler, Alexander ; Esquivel-Muelbert, Adriane ; Rowland, Lucy ; Meir, Patrick ; Lola da Costa, Antonio Carlos ; Nina, Alex ; Sanchez, Jesus ; Tintaya, Jose ; Chino, Rudi ; Baca, Jean ; Fernandes, Leticia ; Cumapa, Edwin ; Santos, João Antônio R. ; Teixeira, Renata ; Tello, Ligia ; Ugarteche, Maira ; Cuellar, Gina ; Martinez, Franklin ; Araujo-Murakami, Alejandro ; Almeida, Everton ; da Cruz, Wesley Jonatar Alves ; del Aguila Pasquel, Jhon ; Aragāo, Luís ; Baker, Timothy ; de Camargo, Plinio Barbosa ; Brienen, Roel ; Castro, Wendeson ; Ribeiro, Sabina Cerruto ; Coelho de Souza, Fernanda ; Cosio, Eric ; Davila Cardozo, Nallaret ; da Costa Silva, Richarlly ; Disney, Mathias ; Espejo, Javier Silva ; Feldpausch, Ted ; Ferreira, Leandro ; Giacomin, Leandro ; Higuchi, Niro ; Hirota, Marina ; Honorio, Euridice ; Huaraca Huasco, Walter ; Lewis, Simon ; Flores Llampazo, Gerardo ; Malhi, Yadvinder ; Monteagudo Mendoza, Abel ; Morandi, Paulo ; Chama Moscoso, Victor ; Muscarella, Robert ; Penha, Deliane ; Rocha, Mayda Cecília ; Rodrigues, Gleicy ; Ruschel, Ademir ; Salinas, Norma ; Schlickmann, Monique ; Silveira, Marcos ; Talbot, Joey ; Vásquez, Rodolfo ; Vedovato, Laura ; Vieira, Simone Aparecida ; Phillips, Oliver ; Gloor, Emanuel ; Galbraith, David ; University of Leeds ; Universidade Estadual de Campinas = University of Campinas (UNICAMP) ; CREAF - Centre for Ecological Research and Applied Forestries ; University of Exeter ; Universität Ulm - Ulm University Ulm, Allemagne ; Universidad Nacional de San Antonio Abad del Cusco (UNSAAC) ; Universidade Federal do Acre (UFAC) ; Botanique et Modélisation de l'Architecture des Plantes et des Végétations (UMR AMAP) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud )-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université de Montpellier (UM) |
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Zeitschrift: | ISSN: 0028-0836, 2023 |
Veröffentlichung: | HAL CCSD ; Nature Publishing Group, 2023 |
Medientyp: | academicJournal |
DOI: | 10.1038/s41586-023-05971-3 |
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