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Plant respiration: Controlled by photosynthesis or biomass?

Collalti, Alessio and Tjoelker, Mark G. and Hoch, Guenter and Makela, Annikki and Guidolotti, Gabriele and Heskel, Mary and Petit, Giai and Ryan, Michael G. and Battipaglia, Giovanna and Matteucci, Giorgio and Prentice, Iain Colin. (2019) Plant respiration: Controlled by photosynthesis or biomass? GLOBAL CHANGE BIOLOGY. p. 15.

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Official URL: https://edoc.unibas.ch/74279/

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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.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Integrative Biologie > Physiological Plant Ecology (Kahmen)
UniBasel Contributors:Hoch, G√ľnter
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:WILEY
ISSN:1354-1013
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:03 Jul 2020 15:08
Deposited On:03 Jul 2020 15:08

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