Empirical evidence for resilience of tropical forest photosynthesis in a warmer world

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Empirical evidence for resilience of tropical forest photosynthesis in a warmer world. / Smith, Marielle; Taylor, Tyeen C.; van Haren, Joost et al.
Yn: Nature Plants, Cyfrol 6, Rhif 10, 10.2020, t. 1225–1230 .

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Smith, M, Taylor, TC, van Haren, J, Rosolem, R, Restrepo-Coupe, N, Adams, J, Wu, J, de Oliveira, RC, da Silva, R, de Araujo, AC, de Camargo, PB, Huxman, TE & Saleska, SR 2020, 'Empirical evidence for resilience of tropical forest photosynthesis in a warmer world', Nature Plants, cyfrol. 6, rhif 10, tt. 1225–1230 . https://doi.org/10.1038/s41477-020-00780-2

APA

Smith, M., Taylor, T. C., van Haren, J., Rosolem, R., Restrepo-Coupe, N., Adams, J., Wu, J., de Oliveira, R. C., da Silva, R., de Araujo, A. C., de Camargo, P. B., Huxman, T. E., & Saleska, S. R. (2020). Empirical evidence for resilience of tropical forest photosynthesis in a warmer world. Nature Plants, 6(10), 1225–1230 . https://doi.org/10.1038/s41477-020-00780-2

CBE

Smith M, Taylor TC, van Haren J, Rosolem R, Restrepo-Coupe N, Adams J, Wu J, de Oliveira RC, da Silva R, de Araujo AC, et al. 2020. Empirical evidence for resilience of tropical forest photosynthesis in a warmer world. Nature Plants. 6(10):1225–1230 . https://doi.org/10.1038/s41477-020-00780-2

MLA

VancouverVancouver

Smith M, Taylor TC, van Haren J, Rosolem R, Restrepo-Coupe N, Adams J et al. Empirical evidence for resilience of tropical forest photosynthesis in a warmer world. Nature Plants. 2020 Hyd;6(10):1225–1230 . Epub 2020 Hyd 12. doi: 10.1038/s41477-020-00780-2

Author

Smith, Marielle ; Taylor, Tyeen C. ; van Haren, Joost et al. / Empirical evidence for resilience of tropical forest photosynthesis in a warmer world. Yn: Nature Plants. 2020 ; Cyfrol 6, Rhif 10. tt. 1225–1230 .

RIS

TY - JOUR

T1 - Empirical evidence for resilience of tropical forest photosynthesis in a warmer world

AU - Smith, Marielle

AU - Taylor, Tyeen C.

AU - van Haren, Joost

AU - Rosolem, Rafael

AU - Restrepo-Coupe, Natalia

AU - Adams, John

AU - Wu, Jin

AU - de Oliveira, Raimundo C.

AU - da Silva, Rodrigo

AU - de Araujo, Alessandro C.

AU - de Camargo, Plinio Barbosa

AU - Huxman, Travis E.

AU - Saleska, Scott R.

PY - 2020/10

Y1 - 2020/10

N2 - Tropical forests may be vulnerable to climate change1,2,3 if photosynthetic carbon uptake currently operates near a high temperature limit4,5,6. Predicting tropical forest function requires understanding the relative contributions of two mechanisms of high-temperature photosynthetic declines: stomatal limitation (H1), an indirect response due to temperature-associated changes in atmospheric vapour pressure deficit (VPD)7, and biochemical restrictions (H2), a direct temperature response8,9. Their relative control predicts different outcomes—H1 is expected to diminish with stomatal responses to future co-occurring elevated atmospheric [CO2], whereas H2 portends declining photosynthesis with increasing temperatures. Distinguishing the two mechanisms at high temperatures is therefore critical, but difficult because VPD is highly correlated with temperature in natural settings. We used a forest mesocosm to quantify the sensitivity of tropical gross ecosystem productivity (GEP) to future temperature regimes while constraining VPD by controlling humidity. We then analytically decoupled temperature and VPD effects under current climate with flux-tower-derived GEP trends in situ from four tropical forest sites. Both approaches showed consistent, negative sensitivity of GEP to VPD but little direct response to temperature. Importantly, in the mesocosm at low VPD, GEP persisted up to 38 °C, a temperature exceeding projections for tropical forests in 2100 (ref. 10). If elevated [CO2] mitigates VPD-induced stomatal limitation through enhanced water-use efficiency as hypothesized9,11, tropical forest photosynthesis may have a margin of resilience to future warming.

AB - Tropical forests may be vulnerable to climate change1,2,3 if photosynthetic carbon uptake currently operates near a high temperature limit4,5,6. Predicting tropical forest function requires understanding the relative contributions of two mechanisms of high-temperature photosynthetic declines: stomatal limitation (H1), an indirect response due to temperature-associated changes in atmospheric vapour pressure deficit (VPD)7, and biochemical restrictions (H2), a direct temperature response8,9. Their relative control predicts different outcomes—H1 is expected to diminish with stomatal responses to future co-occurring elevated atmospheric [CO2], whereas H2 portends declining photosynthesis with increasing temperatures. Distinguishing the two mechanisms at high temperatures is therefore critical, but difficult because VPD is highly correlated with temperature in natural settings. We used a forest mesocosm to quantify the sensitivity of tropical gross ecosystem productivity (GEP) to future temperature regimes while constraining VPD by controlling humidity. We then analytically decoupled temperature and VPD effects under current climate with flux-tower-derived GEP trends in situ from four tropical forest sites. Both approaches showed consistent, negative sensitivity of GEP to VPD but little direct response to temperature. Importantly, in the mesocosm at low VPD, GEP persisted up to 38 °C, a temperature exceeding projections for tropical forests in 2100 (ref. 10). If elevated [CO2] mitigates VPD-induced stomatal limitation through enhanced water-use efficiency as hypothesized9,11, tropical forest photosynthesis may have a margin of resilience to future warming.

U2 - 10.1038/s41477-020-00780-2

DO - 10.1038/s41477-020-00780-2

M3 - Article

VL - 6

SP - 1225

EP - 1230

JO - Nature Plants

JF - Nature Plants

SN - 2055-0278

IS - 10

ER -