Microbial respiration and its consequences on oxygen availability in peat substrate

Rémi Naasz 1 Jean-Charles Michel 1 Sylvain Charpentier 1, *
* Corresponding author
1 SAGAH - Sciences Agronomiques Appliquées à l'Horticulture
Abstract : Oxygen availability to the root not only depends on the gas movement but also on the source-sink relationships involving roots and microorganisms respiration. For some organic soils or substrates, microbial respiration may be very high and could probably make oxygen no more available for the plant. In this context, the main purpose of this study was to model the influence of oxygen consumption by microorganisms in an organic growing media (Sphagnum peat) on oxygen transport and availability to the root. This is why, a one-dimensional transfer coupled model of water and oxygen in porous media was developed taking into account oxygen consumption in the substrate by microorganisms. Simulation results underlined that microbial respiration could cause important reductions in the root oxygen uptake during a one-day time scale simulation (800 mn). For a high microbial respiration rate equal to 120 mg of O2/m3/s, the reduction in oxygen root uptake reaches 60% for the peat substrate. These rapid and important decreases of oxygen content lead to important and sustained anoxic conditions in the root environment.
Keywords : peat oxygen uptake microorganisms substrate-plant system oxygen availability soilless culture soil media
Document type :
Conference papers
Complete list of metadatas

Cited literature [10 references]  Display  Hide  Download
https://hal-agrocampus-ouest.archives-ouvertes.fr/hal-00729766
Contributor : Céline Martel <>
Submitted on : Friday, April 5, 2013 - 11:24:36 AM
Last modification on : Wednesday, March 21, 2018 - 4:08:10 PM
Long-term archiving on : Saturday, July 6, 2013 - 3:05:09 AM

File

naasz_acta_H_2008.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : hal-00729766, version 1

Collections

UNAM | AGROCAMPUS-OUEST | INRA

Citation

Rémi Naasz, Jean-Charles Michel, Sylvain Charpentier. Microbial respiration and its consequences on oxygen availability in peat substrate. Proceedings of the International Symposium on Growing Media, Sep 2005, Angers (FR), France. pp.91-95. ⟨hal-00729766⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

209

Files downloads

336

CONTACT : Catherine Cliquet : publication@agrocampus-ouest.fr