TRAP, Jean; BLANCHART, Eric; RATSIATOSIKA, Onja; RAZAFINDRAKOTO, Malalatiana; BECQUER, Thierry; ANDRIAMANANJARA, Andry; MOREL, Christian

doi:10.1016/j.apsoil.2020.103867

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http://creativecommons.org/licenses/by-nc/

TRAP, Jean
Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes [UMR Eco&Sols]

BLANCHART, Eric
Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes [UMR Eco&Sols]

RATSIATOSIKA, Onja
Laboratoire des RadioIsotopes [LRI]

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Article de revue

Ce document a été publié dans

Applied Soil Ecology. 2021-04, vol. 160, p. 103867

Elsevier

Résumé en anglais

We conducted a greenhouse experiment in mesocosms for 28 days to assess the effects of the endogeic earthworm Pontoscolex corethrurus on plant-available soil phosphorus (P) and rice (Oryza sativa) P nutrition in a Malagasy Ferralsol. To assess plant-available soil P, we determined the L-value by measuring the specific activity of P taken up from the soil by rice and by applying the isotopic dilution principle. Despite earthworm mortality, P. corethrurus significantly increased rice shoot biomass (+26%) and P nutrition (+65%), confirming that the soil used for the experiment was P-deficient. The L-value also markedly increased from 6.8 ± 0.9 to 14.2 ± 1.3 mg P mesocosm−1 in the presence of P. corethrurus. We estimated that the orthophosphate ions released due to earthworm mortality contributed to 30% of the L-value increase. We attributed the remaining 70% increase to the solubilization of native soil P during its transit through the digestive tract. Thereafter, we discussed the sources of uncertainty associated with the L-value calculation and their utilization to assess earthworm effects on P availability in further studies.< Réduire

Mots clés en anglais

Endogeic earthworms

32P-labeling

Isotopic dilution

L-value

Upland rice

Madagascar

URI

https://oskar-bordeaux.fr/handle/20.500.12278/195185

DOI

http://dx.doi.org/10.1016/j.apsoil.2020.103867

Project ANR

Agricultural Sciences for sustainable Development - ANR-10-LABX-0001
MUSE - ANR-16-IDEX-0006

Origine

Importé de hal

Unités de recherche

Interactions Soil Plant Atmosphere (ISPA) - UMR 1391