In Situ Dynamics and Spatial Heterogeneity of Soil Bacterial Communities Under Different Crop Residue Management

Noémie Pascault 1 Bernard Nicolardot 2, 3 Fabiola Bastian 1 Pascal Thiebeau 4 Lionel Ranjard 1 Pierre-Alain Maron 1
1 MSE - Microbiologie du Sol et de l'Environnement
2 Unité d'agronomie Laon Reims Mons
3 BGA - Biologie et Gestion des Adventices
4 FARE - Fractionnement des AgroRessources et Environnement - UMR-A 614
Abstract : The effect of the location of wheat residues (soil surface vs. incorporated in soil) on their decomposition and on soil bacterial communities was investigated by the means of a field experiment. Bacterial-automated ribosomal intergenic spacer analysis of DNA extracts from residues, detritusphere (soil adjacent to residues), and bulk soil evidenced that residues constitute the zone of maximal changes in bacterial composition. However, the location of the residues influenced greatly their decomposition and the dynamics of the colonizing bacterial communities. Sequencing of 16S rRNA gene in DNA extracts from the residues at the early, middle, and late stages of degradation confirmed the difference of composition of the bacterial community according to the location. Bacteria belonging to the γ-subgroup of proteobacteria were stimulated when residues were incorporated whereas the α-subgroup was stimulated when residues were left at the soil surface. Moreover, Actinobacteria were more represented when residues were left at the soil surface. According to the ecological attributes of the populations identified, our results suggested that climatic fluctuations at the soil surface select populations harboring enhanced catabolic and/or survival capacities whereas residues characteristics likely constitute the main determinant of the composition of the bacterial community colonizing incorporated residues.
Keywords :  Bacterial Community  Microbial Biomass  Bulk Soil  Crop Residue  Lignin
Document type :
Journal articles
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https://hal-agrosup-dijon.archives-ouvertes.fr/hal-01862583
Contributor : Bernard Nicolardot <>
Submitted on : Monday, August 27, 2018 - 2:28:01 PM
Last modification on : Friday, November 30, 2018 - 10:34:01 AM

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Noémie Pascault, Bernard Nicolardot, Fabiola Bastian, Pascal Thiebeau, Lionel Ranjard, et al.. In Situ Dynamics and Spatial Heterogeneity of Soil Bacterial Communities Under Different Crop Residue Management. Microbial Ecology, Springer Verlag, 2010, 60 (2), pp.291 - 303. ⟨10.1007/s00248-010-9648-z⟩. ⟨hal-01862583⟩

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