Specific effects of tree species on soil carbon sequestration in a rice-tree association mesocosm experiment: Evidence from natural 13C abundance

Rasoarinaivo Angelina Rondrotsifantenana, Razafimbelo Tantely Maminiana, Blanchart Eric, Chapuis-Lardy Lydie, Chevallier Tiphaine, Bouillet Jean-Pierre, Trap Jean. 2022. Specific effects of tree species on soil carbon sequestration in a rice-tree association mesocosm experiment: Evidence from natural 13C abundance. Rhizosphere, 21:100485, 9 p.

Résumé : Within agroforestry systems, trees greatly contribute to soil carbon (C) sequestration. We still know little about how this contribution varies according to tree species. Here, we quantified the soil C content derived from three main tree species, Eucalyptus robusta, Coffea arabica and Citrus clementina, used in rainfed rice-based agroforestry in the Highlands of Madagascar. A fully factorial controlled mesocosm experiment was performed, with seedlings of the tree species planted with or without rice in a Ferralsol. The natural 13C abundance in the soil was measured to assess tree- and rice-derived C. One year after planting, Eucalyptus robusta was the species exhibiting the highest tree-derived C values, with 148 g C m−2 on average. In contrast, Citrus clementina transferred only 12 g C m−2 to the soil. No significant contribution of Coffea arabica to the soil C stock was found. The presence of rice affected neither the growth of tree seedlings nor their abilities to provide C to the soil. The difference in soil C sequestration among tree species was significantly correlated with differential root biomass. Tree root biomass was significantly correlated with soil δ13C. This experimental assay highlighted the contrasting contributions of tree species to ecological processes such as soil C sequestration at the early stage of agroforestry establishment. Further studies considering tree density and spatial arrangement should be conducted under field conditions to gain further insights into tree contributions to soil C sequestration in agroforestry systems.

Mots-clés Agrovoc : agroforesterie, carbone organique du sol, séquestration du carbone, Oryza sativa, Citrus clementina, Eucalyptus robusta, Coffea arabica

Mots-clés géographiques Agrovoc : Madagascar

Mots-clés libres : Eucalyptus, Citrus, Soil carbon, Coffee, Agroforestry

Classification Agris : F08 - Systèmes et modes de culture
P34 - Biologie du sol

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Auteurs et affiliations

• Rasoarinaivo Angelina Rondrotsifantenana, Université d'Antananarivo (MDG) - auteur correspondant
• Razafimbelo Tantely Maminiana, Université d'Antananarivo (MDG)
• Blanchart Eric, IRD (FRA)
• Chapuis-Lardy Lydie, IRD (FRA)
• Chevallier Tiphaine, IRD (FRA)
• Bouillet Jean-Pierre, CIRAD-PERSYST-UMR Eco&Sols (MDG)
• Trap Jean, IRD (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/600314/)

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