Publications des scientifiques de l'IRD

Razanamalala K., Razafimbelo T., Maron P. A., Ranjard L., Chemidlin N., Lelievre M., Dequiedt S., Ramaroson V. H., Marsden C., Becquer Thierry, Trap Jean, Blanchart Eric, Bernard Laetitia. (2018). Soil microbial diversity drives the priming effect along climate gradients : a case study in Madagascar. ISME Journal, 12 (2), p. 451-462. ISSN 1751-7362.

Titre du document
Soil microbial diversity drives the priming effect along climate gradients : a case study in Madagascar
Année de publication
2018
Type de document
Article référencé dans le Web of Science WOS:000422779100014
Auteurs
Razanamalala K., Razafimbelo T., Maron P. A., Ranjard L., Chemidlin N., Lelievre M., Dequiedt S., Ramaroson V. H., Marsden C., Becquer Thierry, Trap Jean, Blanchart Eric, Bernard Laetitia
Source
ISME Journal, 2018, 12 (2), p. 451-462 ISSN 1751-7362
The priming effect in soil is proposed to be generated by two distinct mechanisms: 'stoichiometric decomposition' and/or 'nutrient mining' theories. Each mechanism has its own dynamics, involves its own microbial actors, and targets different soil organic matter (SOM) pools. The present study aims to evaluate how climatic parameters drive the intensity of each priming effect generation mechanism via the modification of soil microbial and physicochemical properties. Soils were sampled in the center of Madagascar, along climatic gradients designed to distinguish temperature from rainfall effects. Abiotic and biotic soil descriptors were characterized including bacterial and fungal phylogenetic composition. Potential organic matter mineralization and PE were assessed 7 and 42 days after the beginning of incubation with 13C-enriched wheat straw. Both priming mechanisms were mainly driven by the mean annual temperature but in opposite directions. The priming effect generated by stoichiometric decomposition was fostered under colder climates, because of soil enrichment in less developed organic matter, as well as in fast-growing populations. Conversely, the priming effect generated by nutrient mining was enhanced under warmer climates, probably because of the lack of competition between slow-growing populations mining SOM and fast-growing populations for the energy-rich residue entering the soil. Our study leads to hypotheses about the consequences of climate change on both PE generation mechanisms and associated consequences on soil carbon sequestration.
Plan de classement
Sciences du milieu [021] ; Pédologie [068] ; Biologie du sol [074]
Description Géographique
MADAGASCAR
Localisation
Fonds IRD [F B010072003]
Identifiant IRD
fdi:010072003
Contact