PuSH - Publication Server of Helmholtz Zentrum München

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)
Publ. Version/Full Text 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.
Altmetric
Additional Metrics?
[➜Log in]
Edit extra informations Login
Publication type Article: Journal article
Document type Review
Corresponding Author
Keywords 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
Journal Biogeosciences
Quellenangaben Volume: 18, Issue: 12, Pages: 3689-3700 Article Number: , Supplement: ,
Publisher Copernicus
Publishing Place Göttingen
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Groundwater Ecology (IGOE)
Grants Helmholtz Center Munich
Austrian Science Fund
European Research Council under the European Community
Wittgenstein Prize (Austrian Science Fund)