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Fonctionnement du sol sous SCV au Brésil et à Madagascar : abondance et rôle des ingénieurs du sol sur la dynamique du carbone du sol.

Abstract : Direct seeding mulch-based cropping (DMC) systems in the tropics are often described as decreasing erosion, increasing soil carbon storage, decreasing greenhouse gas emissions and increasing biomass production. Soil biota, either microorganisms or fauna, are also said to be strongly modified in DMC systems when compared to traditional tilled systems. Here we present results concerning the abundance (in terms of density and biomass) of soil macrofauna in DMC, traditional and natural systems from Brazil (Rio Verde) and Madagascar (Antsirabe). In a second part we analyse and discuss the role of the main ecosystem engineers (earthworms and Coleopteran larvae) on soil carbon dynamics. The role of ecosystem engineers was approached by laboratory and field experiment in Madagascar. In laboratory, we observed that Coleopteran larvae concentrate organic carbon in their faeces at the difference of endogeic earthworms. In a mesocosm field experiment we studied the effect of endogeic earthworms on soil organic matter and soil functioning according to the localization and quality of residues. In this short-term experiment (5 months) we observed that earthworms increased the amount of soil carbon in their casts and that this carbon was not protected against mineralization.
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http://hal.cirad.fr/cirad-00764065
Contributor : Mahafaka Karen Ranoarisoa <>
Submitted on : Wednesday, December 12, 2012 - 11:41:02 AM
Last modification on : Monday, August 30, 2021 - 11:38:01 AM

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  • HAL Id : cirad-00764065, version 1
  • PRODINRA : 316389

Citation

E. Blanchart, B. Barthès, M. Bernoux, L. Chapuis-Lardy, J.-L. Chotte, et al.. Fonctionnement du sol sous SCV au Brésil et à Madagascar : abondance et rôle des ingénieurs du sol sur la dynamique du carbone du sol.. Terre malgache, 2008, 26, pp.25-28. ⟨cirad-00764065⟩

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