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

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    Smith MN et al_2020_accepted_m ...
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    Final Accepted Manuscript
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    Author
    Smith, Marielle N
    Taylor, Tyeen C
    van Haren, Joost cc
    Rosolem, Rafael
    Restrepo-Coupe, Natalia
    Adams, John
    Wu, Jin cc
    de Oliveira, Raimundo C
    da Silva, Rodrigo
    de Araujo, Alessandro C
    de Camargo, Plinio B
    Huxman, Travis E
    Saleska, Scott R
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    Affiliation
    Univ Arizona, Dept Ecol & Evolutionary Biol
    Univ Arizona, Biosphere 2
    Issue Date
    2020-10-12
    
    Metadata
    Show full item record
    Publisher
    NATURE RESEARCH
    Citation
    Smith, M. N., Taylor, T. C., van Haren, J., Rosolem, R., Restrepo-Coupe, N., Adams, J., ... & Saleska, S. R. (2020). Empirical evidence for resilience of tropical forest photosynthesis in a warmer world. Nature Plants, 6(10), 1225-1230.
    Journal
    NATURE PLANTS
    Rights
    © The Author(s), under exclusive licence to Springer Nature Limited 2020.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Tropical forests may be vulnerable to climate change1-3 if photosynthetic carbon uptake currently operates near a high temperature limit4-6. 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.
    Note
    6 month embargo; published 12 October 2020
    ISSN
    2055-026X
    EISSN
    2055-0278
    PubMed ID
    33051618
    DOI
    10.1038/s41477-020-00780-2
    Version
    Final accepted manuscript
    ae974a485f413a2113503eed53cd6c53
    10.1038/s41477-020-00780-2
    Scopus Count
    Collections
    UA Faculty Publications

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