Per Persson
Dekan
Mineral surface-reactive metabolites secreted during fungal decomposition contribute to the formation of soil organic matter
Författare
Summary, in English
Soil organic matter (SOM) constitutes the largest terrestrial C pool. An emerging, untested, view is that oxidation and depolymerization of SOM by microorganisms promote the formation of SOM-mineral associations that is critical for SOM stabilization. To test this hypothesis, we performed laboratory-scale experiments involving one ectomycorrhizal and one saprotrophic fungus that represent the two major functional groups of microbial decomposers in the boreal forest soils. Fungal decomposition enhanced the retention of SOM on goethite, partly because of oxidative modifications of organic matter (OM) by the fungi. Moreover, both fungi secreted substantial amounts (> 10% new biomass C) of aromatic metabolites that also contributed to an enhanced mineral retention of OM. Our study demonstrates that soil fungi can form mineral-stabilized SOM not only by oxidative conversion of the SOM but also by synthesizing mineral surface-reactive metabolites. Metabolites produced by fungal decomposers can play a yet overlooked role in the formation and stabilization of SOM.
Avdelning/ar
- MEMEG
- Centrum för miljö- och klimatvetenskap (CEC)
- BECC: Biodiversity and Ecosystem services in a Changing Climate
- Mikrobiologisk ekologi
Publiceringsår
2017-12-01
Språk
Engelska
Sidor
5117-5129
Publikation/Tidskrift/Serie
Environmental Microbiology
Volym
19
Issue
12
Dokumenttyp
Artikel i tidskrift
Förlag
Wiley-Blackwell
Ämne
- Microbiology
Status
Published
Projekt
- MICCS - Molecular Interactions Controlling soil Carbon Sequestration
Forskningsgrupp
- Microbial Ecology
ISBN/ISSN/Övrigt
- ISSN: 1462-2912