Publications des scientifiques de l'IRD

Chapuis Lardy Lydie, Ramiandrisoa R.S., Randriamanantsoa L., Morel C., Rabeharisoa L., Blanchart Eric. (2009). Modification of P availability by endogenic earthworms (Glossoscolecidae) in Ferralsols of the Malagasy Highlands. Biology and Fertility of Soils, 45 (4), p. 415-422. ISSN 1432-0789.

Titre du document
Modification of P availability by endogenic earthworms (Glossoscolecidae) in Ferralsols of the Malagasy Highlands
Année de publication
2009
Type de document
Article référencé dans le Web of Science WOS:000263671100009
Auteurs
Chapuis Lardy Lydie, Ramiandrisoa R.S., Randriamanantsoa L., Morel C., Rabeharisoa L., Blanchart Eric
Source
Biology and Fertility of Soils, 2009, 45 (4), p. 415-422 ISSN 1432-0789
Low phosphorus (P) availability in Ferralsols of the Malagasy Highlands is a major limitation to crop growth. Direct seeding mulch-based cropping practices which were adopted in the region to improve and sustain soil fertility are known to favour earthworms' presence. The mesocosm study aims to analyse the effect of an endogeic geophageous earthworm species on the soil P status. Total P content (P (t)), NaOH-extractable P content, P ions (Pi) concentration (C (p)) in solution and rapid and slow reactions of Pi in solution with solid phase were determined in two Malagasy Ferralsols. Both C (p) and reactions rates were assessed in laboratory batch experiments using (32)Pi labelling and isotopic exchange kinetics (IEK). The P (t) values were 836 and 349 mg P g(-1) in a clayey soil and a sandy-clayey soil, respectively. For both soils, NaOH-extractable organic P was significantly higher in earthworm casts than in parent soils, whereas Pt was unchanged. Also, the effect of earthworm ingestion significantly changed parameters of the IEK. In casts compared with the soil from which they were derived, the immediate isotopically exchangeable Pi (E (1 min)) increased by 116%, whereas relative rates of Pi release at the solid-to-solution with time were slightly lowered. The effect of earthworm ingestion on IEK corresponded to a transfer of slowly exchangeable Pi towards quicker Pi pools of exchange. However, according to the literature, the increase in E (1 min) remained below the critical level for optimal growth, stating that the soils remained P-deficient even in the presence of active and numerous earthworms.
Plan de classement
Pédologie appliquée [068PEDAPP] ; Macrofaune [074FAUSOL03]
Descripteurs
FERTILITE DU SOL ; DISPONIBILITE EN NUTRIMENTS ; PHOSPHORE ; LOMBRIC ; HAUTE ALTITUDE ; BIODISPONIBILITE
Description Géographique
ZONE TROPICALE ; MADAGASCAR
Localisation
Fonds IRD [F B010045383]
Identifiant IRD
fdi:010045383
Contact