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Journal articles
In Situ Dynamics and Spatial Heterogeneity of Soil Bacterial Communities Under Different Crop Residue Management
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.
https://hal-agrosup-dijon.archives-ouvertes.fr/hal-01862583
Contributor : Bernard Nicolardot Connect in order to contact the contributor
Submitted on : Monday, August 27, 2018 - 2:28:01 PM
Last modification on : Friday, January 21, 2022 - 2:26:05 PM
Contributor : Bernard Nicolardot Connect in order to contact the contributor
Submitted on : Monday, August 27, 2018 - 2:28:01 PM
Last modification on : Friday, January 21, 2022 - 2:26:05 PM
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