Blanchart Eric, Albrecht Alain, Alegre J., Duboisset Arnaud, Gilot Cécile, Pashanasi B., Lavelle P., Brussaard L. (1999). Effects of earthworms on soil structure and physical properties. In :
Lavelle P. (ed.), Brussaard L. (ed.), Hendrix P. (ed.). Earthworm management in tropical agroecosystems. Wallingford : CABI, p. 149-172. ISBN 0-85199-270-6.
Titre du document
Effects of earthworms on soil structure and physical properties
Année de publication
1999
Type de document
Partie d'ouvrage
Auteurs
Blanchart Eric, Albrecht Alain, Alegre J., Duboisset Arnaud, Gilot Cécile, Pashanasi B., Lavelle P., Brussaard L.
In
Lavelle P. (ed.), Brussaard L. (ed.), Hendrix P. (ed.), Earthworm management in tropical agroecosystems
Source
Wallingford : CABI, 1999,
p. 149-172 ISBN 0-85199-270-6
The effects of earthworms on soil structure and the resulting physical properties in natural or cultivated systems were studied in different sites of the Macrofauna project. Four main results were obtained from these experiments : (1) In kaolinitic soils (Lamto, Manaus, Yurimaguas), irrespective of clay content, andogeic earthworms play a major role in soil structure formation and maintenance, while in smectitic soils (Martinique), the effects of earthworms on soil structure formation and maintenance are not as clear. In the Vertisols of Martinique, the effect of roots and organic materials seem predominant in soil structure development and earthworms play a secondary role. (2) Endogeic earthworm species have different effects on soil properties. Large earthworms such as Pontoscolex corethrurus or Millsonia anomala egest large and compact casts. They increase the proportion of large aggregates in soil and the bulk density ; they are called "compacting species". Conversely, small earthworm species such as eudrilid worms feed at least partly on large compact casts and egest smaller and fragile aggregates. They decrease the proportion of large aggregates in soil and the bulk density ; they are called "decompacting species". The effects of "compacting species" on soil structure formation seem to be linked to the presence of organic residues at the soil surface. In agroecosystems of Yurimaguas (Peru), the intense activity of P. corethrurus and the coalescence of surface casts lead to the formation of a compact surfacecrust with impedes water infiltration in the absence of organic residues, but a favourable macroaggregate structure develops in the presence of organic residues and leguminous mulch. (3) The introduction of earthworms in agroecosystems changes soil physical properties and especially water retention and infiltration... (D'après résumé d'auteur)
Plan de classement
Erosion et conservation des sols [068EROSOL]
;
Macrofaune [074FAUSOL03]
Descripteurs
LOMBRIC ; STRUCTURE DU SOL ; PROPRIETE PHYSIQUE ; INFILTRATION ; FERTILITE DU SOL ; EROSION ; RESISTANCE ; ERODIBILITE DU SOL ; ETUDE EXPERIMENTALE ; ETUDE COMPARATIVE
Description Géographique
ZONE TROPICALE HUMIDE ; COTE D'IVOIRE ; MEXIQUE ; PEROU ; BRESIL ; MARTINIQUE ; INDE
Localisation
Fonds IRD [F A010021553]
Identifiant IRD
fdi:010021558
