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Short term bacterial community structure dynamics in forest soil and litter: an in situ study in a CarboEurope site.

Abstract : Acting as both sink and source in the terrestrial carbon cycle, soils play an important role. In forests, soils contain up to 70% of total ecosystem C and contribute to 40% to 70% of total ecosystem respiration. Therefore, in a climate change context, understanding soil microbial community dynamics and its consequences on soil functioning is a major issue. The objective of this study was to determine if changes in the inputs of fresh litter quantity could influence the structure of bacterial communities (named BCS) and their dynamics in a forest soil. The experiment took place in Barbeau national forest (CARBOEUROPE site; Fontainebleau, France). Three treatments of fresh litter inputs were applied: 0L: no litter, 1L: litter added at the natural rate and 2L: litter added at twice the natural rate. BCS was followed every month during one year using a molecular fingerprinting (Ribosomal-Intergenic-Spacer- Analysis) technique. At the same time, intensity and isotopic composition (δ13C), of soil and litter CO2 effluxes were measured as well as soil and ecosystem climatic parameters. Soil BCS was very dynamic through the year and resilient as soon as no fresh litter was added. Litter BCS was also very dynamic but not affected by litter quantity. In all treatments, BCS during cold periods was markedly different from the rest of the year suggesting some climatic control on BCS. Last, coinertia analysis revealed a link between litter BCS and CO2 efflux intensity and δ13C in the 2L treatment. No link was observed in soil probably due to the multiplicity of CO2 sources. Understanding soil or litter BCS dynamics still needs more investigations, particularly concerning its climatic dependence. On the other hand, linking BCS to soil functions would help to reach a functional decomposition of the soil system and a better understanding of the climatic control of soil functions.
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Conference papers
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https://hal-bioemco.ccsd.cnrs.fr/bioemco-00390583
Contributor : Jean-Christophe Lata <>
Submitted on : Tuesday, June 2, 2009 - 2:28:55 PM
Last modification on : Friday, June 5, 2020 - 6:14:01 AM

Identifiers

  • HAL Id : bioemco-00390583, version 1
  • PRODINRA : 245516

Citation

Nicolas Chemidlin Prévost-Bouré, Lionel Ranjard, Virginie Nowak, Claire Damesin, Eric Dufrene, et al.. Short term bacterial community structure dynamics in forest soil and litter: an in situ study in a CarboEurope site.. Short term bacterial community structure dynamics in forest soil and litter: an in situ study in a CarboEurope site., May 2008, Vienna, Austria. pp.52. ⟨bioemco-00390583⟩

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