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Braun, A. ; Spona-Friedl, M. ; Avramov, M. ; Elsner, M. ; Baltar, F.* ; Reinthaler, T.* ; Herndl, G.J.* ; Griebler, C.

Reviews and syntheses: Heterotrophic fixation of inorganic carbon - Significant but invisible flux in environmental carbon cycling.

Biogeosciences 18, 3689-3700 (2021)
Verlagsversion DOI
Open Access Gold
Creative Commons Lizenzvertrag
Heterotrophic CO2 fixation is a significant yet underappreciated CO2 flux in environmental carbon cycling. In contrast to photosynthesis and chemolithoautotrophy - the main recognized autotrophic CO2 fixation pathways - the importance of heterotrophic CO2 fixation remains enigmatic. All heterotrophs - from microorganisms to humans - take up CO2 and incorporate it into their biomass. Depending on the availability and quality of growth substrates, and drivers such as the CO2 partial pressure, heterotrophic CO2 fixation contributes at least 1%-5% and in the case of methanotrophs up to 50% of the carbon biomass. Assuming a standing stock of global heterotrophic biomass of 47-85PgC, we roughly estimate that up to 5PgC might be derived from heterotrophic CO2 fixation, and up to 12PgCyr-1 originating from heterotrophic CO2 fixation is funneled into the global annual heterotrophic production of 34-245PgCyr-1. These first estimates on the importance of heterotrophic fixation of inorganic carbon indicate that this pathway should be incorporated in present and future carbon cycling budgets.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Review
Korrespondenzautor
Schlagwörter Introduced Organic-compounds; Dark Co2 Fixation; Dioxide Fixation; Bicarbonate Assimilation; Bacterial-populations; Water Column; Groundwater; Ocean; Growth; Respiration
ISSN (print) / ISBN 1726-4170
e-ISSN 1726-4189
Zeitschrift Biogeosciences
Quellenangaben Band: 18, Heft: 12, Seiten: 3689-3700 Artikelnummer: , Supplement: ,
Verlag Copernicus
Verlagsort Göttingen
Nichtpatentliteratur Publikationen
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Groundwater Ecology (IGOE)
Förderungen Helmholtz Center Munich
Austrian Science Fund
European Research Council under the European Community
Wittgenstein Prize (Austrian Science Fund)