ID:
publications-1806
Type:
Peer reviewed articles
Year:
2020
Authors:
Alessio Collalti, Mark G. Tjoelker, GĂŒnter Hoch, Annikki MĂ€kelĂ€, Gabriele Guidolotti, Mary Heskel, Giai Petit, Michael G. Ryan, Giovanna Battipaglia, Giorgio Matteucci, Iain Colin Prentice
Title:
Plant respiration: Controlled by photosynthesis or biomass?
Venue/Journal:
Global Change Biology
DOI:
10.1111/gcb.14857
Research type:
Simulation & Modeling
Water System:
River Basins
Technical Focus:
Abstract:
AbstractTwo simplifying hypotheses have been proposed for wholeâplant respiration. One links respiration to photosynthesis; the other to biomass. Using a firstâprinciples 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 carryâover of fixed carbon between years, while the second implies far too great an increase in respiration during stand developmentâleading 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.
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787203
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