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Soil bacterial community mediates the effect of plant material on methanogenic decomposition of soil organic matter

Soil bacterial community mediates the effect of plant material on methanogenic decomposition of soil organic matter
Soil bacterial community mediates the effect of plant material on methanogenic decomposition of soil organic matter
Input of plant material may strongly change decomposition rates of soil organic matter (SOM), i.e. causing priming effect (PE), but the underlying mechanisms are largely unknown. We found that rice straw addition in anoxic Fuyang (F) rice field soil stimulated CH4 production from SOM at the expense of CO2, whereas in Uruguay (U) soil it suppressed SOM degradation to CO2 plus CH4 (negative PE). Reciprocal inoculation experiments with non-sterile and sterile soils showed that the soils always displayed the effect of rice straw characteristic for the live microbial community rather than for the soil physicochemical properties. Pyrosequencing of 16S rRNA genes showed that bacterial communities in these soil samples were separated into two clusters (F and U). Symbiobacterium was abundant or dominant in microbiota from U soil, but negligible in those from F soil. Network analysis indicated that the bacterial populations involved in SOM decomposition were different between soils of F and U clusters; moreover, they were more tightly connected to methanogens in U than in F clusters. Ultimately, our results suggested that the PE of rice straw is mediated by the composition and activity of soil microbial community.
0038-0717
99-109
Quan, Yuan
eee5dd77-f1f2-4bc8-b8b9-aa5532f0525c
Hernandez Garcia, Marcela
e73477e7-cf3e-4f50-97c8-4494c5b05cd0
Dumont, Marc
afd9f08f-bdbb-4cee-b792-1a7f000ee511
Rui, Junpeng
5339f018-7bb3-4883-b427-9b30561dce25
Fernandez Scavino, Ana
c4447cbc-c5ea-43ab-805e-8e7b1cdf9a9a
Conrad, Ralf
a64808b6-b6f2-4fb4-b5ea-c192622fa704
Quan, Yuan
eee5dd77-f1f2-4bc8-b8b9-aa5532f0525c
Hernandez Garcia, Marcela
e73477e7-cf3e-4f50-97c8-4494c5b05cd0
Dumont, Marc
afd9f08f-bdbb-4cee-b792-1a7f000ee511
Rui, Junpeng
5339f018-7bb3-4883-b427-9b30561dce25
Fernandez Scavino, Ana
c4447cbc-c5ea-43ab-805e-8e7b1cdf9a9a
Conrad, Ralf
a64808b6-b6f2-4fb4-b5ea-c192622fa704

Quan, Yuan, Hernandez Garcia, Marcela, Dumont, Marc, Rui, Junpeng, Fernandez Scavino, Ana and Conrad, Ralf (2018) Soil bacterial community mediates the effect of plant material on methanogenic decomposition of soil organic matter Soil Biology and Biochemistry, 116, pp. 99-109.

Record type: Article

Abstract

Input of plant material may strongly change decomposition rates of soil organic matter (SOM), i.e. causing priming effect (PE), but the underlying mechanisms are largely unknown. We found that rice straw addition in anoxic Fuyang (F) rice field soil stimulated CH4 production from SOM at the expense of CO2, whereas in Uruguay (U) soil it suppressed SOM degradation to CO2 plus CH4 (negative PE). Reciprocal inoculation experiments with non-sterile and sterile soils showed that the soils always displayed the effect of rice straw characteristic for the live microbial community rather than for the soil physicochemical properties. Pyrosequencing of 16S rRNA genes showed that bacterial communities in these soil samples were separated into two clusters (F and U). Symbiobacterium was abundant or dominant in microbiota from U soil, but negligible in those from F soil. Network analysis indicated that the bacterial populations involved in SOM decomposition were different between soils of F and U clusters; moreover, they were more tightly connected to methanogens in U than in F clusters. Ultimately, our results suggested that the PE of rice straw is mediated by the composition and activity of soil microbial community.

Text Quan_2017-accepted version - Accepted Manuscript
Restricted to Repository staff only until 15 October 2018.
Text yuan-et-al-2018 - Version of Record
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More information

Accepted/In Press date: 6 October 2017
e-pub ahead of print date: 16 October 2017
Published date: January 2018

Identifiers

Local EPrints ID: 415040
URI: http://eprints.soton.ac.uk/id/eprint/415040
ISSN: 0038-0717
PURE UUID: cee063b2-b2d1-4247-881e-eb67c131772b
ORCID for Marc Dumont: ORCID iD orcid.org/0000-0002-7347-8668

Catalogue record

Date deposited: 23 Oct 2017 16:30
Last modified: 30 Oct 2017 11:23

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Contributors

Author: Yuan Quan
Author: Marc Dumont ORCID iD
Author: Junpeng Rui
Author: Ana Fernandez Scavino
Author: Ralf Conrad

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