Dynamics of bacterial communities in relation to soil aggregate formation during the decomposition of 13C-labelled rice straw
By A. Blaud, T. Lerch, T. Chevallier, N. Nunan, Claire Chenu, A. Brauman. 2012
103 citations recorded by the source corpus.
Abstract The addition of fresh organic matter is known to modify both microbial community structure and soil aggregation. The objective of this study was to understand the relationship between the dynamics of the soil microbial community structure in relation to that of their habitats during the decomposition of straw. Soil samples, ground ( 13 C-labelled powdered rice straw ( C Straw ) mineralised or remaining in different soil fractions (0–50, 50–200, 200–2000 and >2000 μm) were measured. Fatty acid methyl ester (FAME) profiling was used to determine total bacterial community structure and FAME based stable isotope probing (FAME-SIP) was used to characterise the straw degrader communities. The mineralisation rate of the native C and the C Straw was high. The formation of macroaggregates (>2000 μm) occurred within 2 days in amended and unamended samples but did so to a greater extent in the amended samples. The C Straw was mainly located in fractions >200 μm, where degraders were the most abundant. The 13 C-FAME profiles followed the same trends as total FAME profiles through time and within soil fractions, suggesting common dynamics between straw degraders and total bacterial communities: Gram-negative were more important in fraction >200 μm and during the early stages of the incubation while Gram-positive and actinobacteria dominated in fine fractions and at the end of the incubation. Bacterial community structure changed rapidly (within 2 days) in conjunction with the formation of new microbial habitats, suggesting that the relationship between the two is very close.
Subfields: Ecology, Health, Toxicology and Mutagenesis, Soil Science
View Paper: https://www.semanticscholar.org/paper/6a42d2ffe082694b89b30dae68c2e15e852abf5f
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In Ecology
Citations in the corpus
- Microbial Extracellular Polymeric Substances: Ecological Function and Impact on Soil Aggregation (2018, methodology): “For many decades, the microbial communities inside different classes of aggregates have been investigated using several techniques and experimental designs (Blaud et al., 2012, 2017; Davinic et al., 2012; Zhang et al., 2018).”