Reduced global plant respiration due to the acclimation of leaf dark respiration coupled with photosynthesis

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dc.creatorRen, Yanghang
dc.creatorWang, Han
dc.creatorHarrison, Sandy P.
dc.creatorPrentice, I. Colin
dc.creatorAtkin, Owen K.
dc.creatorSmith, Nicholas G. (TTU)
dc.creatorMengoli, Giulia
dc.creatorStefanski, Artur
dc.creatorReich, Peter B.
dc.date.accessioned2023-11-16T21:34:58Z
dc.date.available2023-11-16T21:34:58Z
dc.date.issued2023
dc.description© 2023 The Authors. New Phytologist © 2023 New Phytologist Foundation. cc-by-nc
dc.description.abstractLeaf dark respiration (Rd) acclimates to environmental changes. However, the magnitude, controls and time scales of acclimation remain unclear and are inconsistently treated in ecosystem models. We hypothesized that Rd and Rubisco carboxylation capacity (Vcmax) at 25°C (Rd,25, Vcmax,25) are coordinated so that Rd,25 variations support Vcmax,25 at a level allowing full light use, with Vcmax,25 reflecting daytime conditions (for photosynthesis), and Rd,25/Vcmax,25 reflecting night-time conditions (for starch degradation and sucrose export). We tested this hypothesis temporally using a 5-yr warming experiment, and spatially using an extensive field-measurement data set. We compared the results to three published alternatives: Rd,25 declines linearly with daily average prior temperature; Rd at average prior night temperatures tends towards a constant value; and Rd,25/Vcmax,25 is constant. Our hypothesis accounted for more variation in observed Rd,25 over time (R2 = 0.74) and space (R2 = 0.68) than the alternatives. Night-time temperature dominated the seasonal time-course of Rd, with an apparent response time scale of c. 2 wk. Vcmax dominated the spatial patterns. Our acclimation hypothesis results in a smaller increase in global Rd in response to rising CO2 and warming than is projected by the two of three alternative hypotheses, and by current models.
dc.identifier.citationRen, Y., Wang, H., Harrison, S.P., Prentice, I.C., Atkin, O.K., Smith, N.G., Mengoli, G., Stefanski, A., & Reich, P.B.. 2023. Reduced global plant respiration due to the acclimation of leaf dark respiration coupled with photosynthesis. New Phytologist. https://doi.org/10.1111/nph.19355
dc.identifier.urihttps://doi.org/10.1111/nph.19355
dc.identifier.urihttps://hdl.handle.net/2346/96775
dc.language.isoeng
dc.subjectcarboxylation capacity
dc.subjectclimate change
dc.subjectdark respiration
dc.subjecteco-evolutionary optimality
dc.subjectglobal carbon cycle
dc.subjectland surface model
dc.subjectplant acclimation
dc.titleReduced global plant respiration due to the acclimation of leaf dark respiration coupled with photosynthesis
dc.typeArticle

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