Agricultural management affects the response of soil bacterial community structure and respiration to water-stress

Kaisermann, Aurore and Roguet, Adélaïde and Nunan, Naoise and Maron, Pierre Alain and Ostle, Nicholas and Lata, Jean Christophe (2013) Agricultural management affects the response of soil bacterial community structure and respiration to water-stress. Soil Biology and Biochemistry, 66. pp. 69-77. ISSN 0038-0717

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Abstract

Soil microorganisms are responsible for organic matter decomposition processes that regulate soil carbon storage and mineralisation to CO2. Climate change is predicted to increase the frequency of drought events, with uncertain consequences for soil microbial communities. In this study we tested the hypothesis that agricultural management used to enhance soil carbon stocks would increase the stability of microbial community structure and activity in response to water-stress. Soil was sampled from a long-term field trial with three soil carbon management systems and was used in a laboratory study of theeffect of a dry-wet cycle on organic C mineralisation and microbial community structure. After a drying-rewetting event, soil microcosms were maintained wet and microbial community structure and abundance as well as microbial respiration were measured for four weeks. The results showed that the NO-TILL management system, with the highest soil organic matter content and respiration rate, had a distinct bacterial community structure relative to the conventional and the TILL without fertiliser systems. In all management systems, the rewetting event clearly modified microbial community structure and activity. Both returned to their pre-drought state after 28 days. However, the magnitude of variation of C mineralisation was lower (i.e. the resistance to stress was higher) in the NO-TILL system. The genetic structure of the NO-TILL bacterial communities was most modified by water-stress and exhibited a slower recovery rate. This suggests that land use management can increase microbial functional resistance to drought stress via the establishment of bacterial communities with particular metabolic capacities. Nevertheless, the resilience rates of C mineralisation were similar among management regimes, suggesting that similar mechanisms occur, maybe due to a common soil microbial community legacy.

Item Type:
Journal Article
Journal or Publication Title:
Soil Biology and Biochemistry
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1100/1111
Subjects:
ID Code:
128423
Deposited By:
Deposited On:
22 Oct 2018 10:08
Refereed?:
Yes
Published?:
Published
Last Modified:
13 May 2020 05:45