Basin-wide variation in tree hydraulic safety margins predicts the carbon balance of Amazon forests

Medientyp: E-Artikel
Titel: Basin-wide variation in tree hydraulic safety margins predicts the carbon balance of Amazon forests
Beteiligte: Tavares, Julia Valentim; Oliveira, Rafael S.; Mencuccini, Maurizio; Signori-Müller, Caroline; Pereira, Luciano; Diniz, Francisco Carvalho; Gilpin, Martin; Marca Zevallos, Manuel J.; Salas Yupayccana, Carlos A.; Acosta, Martin; Pérez Mullisaca, Flor M.; Barros, Fernanda de V.; Bittencourt, Paulo; Jancoski, Halina; Scalon, Marina Corrêa; Marimon, Beatriz S.; Oliveras Menor, Imma; Marimon, Ben Hur; Fancourt, Max; Chambers-Ostler, Alexander; Esquivel-Muelbert, Adriane; Rowland, Lucy; Meir, Patrick; Lola da Costa, Antonio Carlos; [...]
Erschienen: Springer Science and Business Media LLC, 2023
Erschienen in: Nature
Sprache: Englisch
DOI: 10.1038/s41586-023-05971-3
ISSN: 0028-0836; 1476-4687
Schlagwörter: Multidisciplinary
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Beschreibung: <jats:title>Abstract</jats:title><jats:p>Tropical forests face increasing climate risk<jats:sup>1,2</jats:sup>, 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, <jats:inline-formula><jats:alternatives><jats:tex-math>$$\varPsi $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>Ψ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula><jats:sub>50</jats:sub>) and hydraulic safety margins (for example, HSM<jats:sub>50</jats:sub>) are important predictors of drought-induced mortality risk<jats:sup>3–5</jats:sup>, 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 <jats:inline-formula><jats:alternatives><jats:tex-math>$$\varPsi $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>Ψ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula><jats:sub>50</jats:sub> and HSM<jats:sub>50</jats:sub> vary markedly across the Amazon and are related to average long-term rainfall characteristics. Both <jats:inline-formula><jats:alternatives><jats:tex-math>$$\varPsi $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>Ψ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula><jats:sub>50</jats:sub> and HSM<jats:sub>50</jats:sub> influence the biogeographical distribution of Amazon tree species. However, HSM<jats:sub>50</jats:sub> was the only significant predictor of observed decadal-scale changes in forest biomass. Old-growth forests with wide HSM<jats:sub>50</jats:sub> are gaining more biomass than are low HSM<jats:sub>50</jats:sub> 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 HSM<jats:sub>50</jats:sub> in the Amazon<jats:sup>6,7</jats:sup>, with strong implications for the Amazon carbon sink.</jats:p>

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