Direct evidence for the role of microbial community composition in the formation of soil organic matter composition and persistence

Details

Ressource 1Download: Domeignoz-Horta_et_al-2021-ISME_Communications.pdf (1007.46 [Ko])
State: Public
Version: Final published version
License: CC BY 4.0
Serval ID
serval:BIB_D72F2EE2430B
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Direct evidence for the role of microbial community composition in the formation of soil organic matter composition and persistence
Journal
ISME Communications
Author(s)
Domeignoz-Horta Luiz A., Shinfuku Melissa, Junier Pilar, Poirier Simon, Verrecchia Eric, Sebag David, DeAngelis Kristen M.
ISSN
2730-6151
Publication state
Published
Issued date
11/2021
Peer-reviewed
Oui
Volume
1
Number
64
Language
english
Abstract
The largest terrestrial carbon sink on earth is soil carbon stocks. As the climate changes, the rate at which the Earth’s climate warms depends in part on the persistence of soil organic carbon. Microbial turnover forms the backbone of soil organic matter (SOM) formation and it has been recently proposed that SOM molecular complexity is a key driver of stability. Despite this, the links between microbial diversity, chemical complexity and biogeochemical nature of SOM remain missing. Here we tested the hypotheses that distinct microbial communities shape the composition of SOM, and microbial-derived SOM has distinct decomposition potential depending on its community of origin. We inoculated microbial communities of varying diversities into a model soil matrix amended with simple carbon (cellobiose) and measured the thermal stability of the resultant SOM. Using a Rock-Eval® ramped thermal analysis, we found that microbial community composition drives the chemical fingerprint of soil carbon. While diversity was not a driver of SOM composition, bacteria-only communities lead to more thermally labile soil C pools than communities with bacteria and fungi. Our results provide direct evidence for a link between microbial community structure, SOM composition, and thermal stability. This evidence demonstrates the relevance of soil microorganisms in building persistent SOM stocks.
Open Access
Yes
Create date
07/11/2021 18:30
Last modification date
24/12/2022 6:44
Usage data