Plant respiration: controlled by photosynthesis or biomass?

Alessio Collalti*, Mark G. Tjoelker, Günter Hoch, Annikki Mäkelä, Gabriele Guidolotti, Mary Heskel, Giai Petit, Michael G. Ryan, Giovanna Battipaglia, Giorgio Matteucci, Iain Colin Prentice

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    40 Citations (Scopus)

    Abstract

    Two simplifying hypotheses have been proposed for whole-plant respiration. One links respiration to photosynthesis; the other to biomass. Using a first-principles carbon balance model with a prescribed live woody biomass turnover, applied at a forest research site where multidecadal measurements are available for comparison, we show that if turnover is fast the accumulation of respiring biomass is low and respiration depends primarily on photosynthesis; while if turnover is slow the accumulation of respiring biomass is high and respiration depends primarily on biomass. But the first scenario is inconsistent with evidence for substantial carry-over of fixed carbon between years, while the second implies far too great an increase in respiration during stand development—leading to depleted carbohydrate reserves and an unrealistically high mortality risk. These two mutually incompatible hypotheses are thus both incorrect. Respiration is not linearly related either to photosynthesis or to biomass, but it is more strongly controlled by recent photosynthates (and reserve availability) than by total biomass.

    Original languageEnglish
    Pages (from-to)1739-1753
    Number of pages15
    JournalGlobal Change Biology
    Volume26
    Issue number3
    DOIs
    Publication statusPublished - Mar 2020

    Keywords

    • biomass accumulation
    • carbon use efficiency
    • gross primary production
    • maintenance respiration
    • metabolic scaling theory
    • net primary production
    • nonstructural carbohydrates
    • plant respiration

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