Sticky dead microbes: rapid abiotic retention of microbial necromass in soil

Buckeridge, Kate M.; La Rosa, Alfio Fabio; Mason, Kelly E. ORCID: https://orcid.org/0000-0003-3426-3178; Whitaker, Jeanette ORCID: https://orcid.org/0000-0001-8824-471X; McNamara, Niall P. ORCID: https://orcid.org/0000-0002-5143-5819; Grant, Helen K.; Ostle, Nick J.. 2020 Sticky dead microbes: rapid abiotic retention of microbial necromass in soil. Soil Biology and Biochemistry, 149, 107929. 4, pp. 10.1016/j.soilbio.2020.107929

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Official URL: http://dx.doi.org/10.1016/j.soilbio.2020.107929

Abstract/Summary

Microbial necromass dominates soil organic matter. Recent research on necromass and soil carbon storage has focused on necromass production and stabilization mechanisms but not on the mechanisms of necromass retention. We present evidence from soil incubations with stable-isotope labeled necromass that abiotic adsorption may be more important than biotic immobilization for short-term necromass retention. We demonstrate that necromass adsorbs not only to mineral surfaces, but may also interact with other necromass. Furthermore, necromass cell chemistry alters necromass-necromass interaction, with more bacterial tracer retained when there is yeast necromass present. These findings suggest that the adsorption and abiotic interaction of microbial necromass and its functional properties, beyond chemical stability, deserve further investigation in the context of soil carbon sequestration.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1016/j.soilbio.2020.107929
UKCEH and CEH Sections/Science Areas:	Pollution (Science Area 2017-) Soils and Land Use (Science Area 2017-)
ISSN:	0038-0717
Additional Information. Not used in RCUK Gateway to Research.:	Open Access paper - full text available via Official URL link.
Additional Keywords:	soil organic matter, functional properties, stable isotope, grassland pasture, carbon sequestration, nitrogen
NORA Subject Terms:	Agriculture and Soil Science
Date made live:	14 Sep 2020 11:14 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/528466

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1016/j.soilbio.2020.107929

UKCEH and CEH Sections/Science Areas:

Pollution (Science Area 2017-)
Soils and Land Use (Science Area 2017-)

ISSN:

0038-0717

Additional Information. Not used in RCUK Gateway to Research.:

Open Access paper - full text available via Official URL link.

Additional Keywords:

soil organic matter, functional properties, stable isotope, grassland pasture, carbon sequestration, nitrogen