Agroecosystem diversification with legumes or non-legumes improves differently soil fertility according to soil type

Sauvadet Marie, Trap Jean, Damour Gaëlle, Plassard Claude, Van Den Meersche Karel, Achard Raphaël, Allinne Clémentine, Autfray Patrice, Bertrand Isabelle, Blanchart Eric, Deberdt Peninna, Enock Seguy, Essobo Nieboukaho Jean-Daniel, Freschet Grégoire T., Hedde Mickaël, de Melo Virginio Filho Elias, Rabary Bodovololona, Rakotoarivelo Miora, Randriamanantsoa Richard, Rhino Béatrice, Ripoche Aude, Rosalie Elisabeth, Saj Stéphane, Becquer Thierry, Tixier Philippe, Harmand Jean-Michel. 2021. Agroecosystem diversification with legumes or non-legumes improves differently soil fertility according to soil type. Science of the Total Environment, 785:148934, 11 p.

Url - jeu de données - Entrepôt autre : https://doi.org/10.5061/dryad.2fqz612ph

Quartile : Q1, Sujet : ENVIRONMENTAL SCIENCES

Résumé : Plant diversification through crop rotation or agroforestry is a promising way to improve sustainability of agroecosystems. Nonetheless, criteria to select the most suitable plant communities for agroecosystems diversification facing contrasting environmental constraints need to be refined. Here, we compared the impacts of 24 different plant communities on soil fertility across six tropical agroecosystems: either on highly weathered Ferralsols, with strong P limitation, or on partially weathered soils derived from volcanic material, with major N limitation. In each agroecosystem, we tested several plant communities for diversification, as compared to a matching low diversity management for their cropping system. Plant residue restitution, N, P and lignin contents were measured for each plant community. In parallel, the soil under each community was analyzed for organic C and N, inorganic N, Olsen P, soil pH and nematode community composition. Soil potential fertility was assessed with plant bioassays under greenhouse controlled climatic conditions. Overall, plant diversification had a positive effect on soil fertility across all sites, with contrasting effects depending on soil type and legumes presence in the community. Communities with legumes improved soil fertility indicators of volcanic soils, which was demonstrated through significantly higher plant biomass production in the bioassays (+18%) and soil inorganic N (+26%) compared to the low diversity management. Contrastingly, communities without legumes were the most beneficial in Ferralsols, with increases in plant biomass production in the bioassays (+39%), soil Olsen P (+46%), soil C (+26%), and pH (+5%). Piecewise structural equation models with Shipley's test revealed that plant diversification impacts on volcanic soil fertility were related to soil N availability, driven by litter N. Meanwhile, Ferralsols fertility was related to soil P availability, driven by litter P. These findings underline the importance of multifactorial and multi-sites experiments to inform trait-based frameworks used in designing optimal plant diversification in agroecological systems.

Mots-clés Agrovoc : agroécosystème, diversification, légume, fertilité du sol, caractère agronomique, sol volcanique, sol tropical, indicateur écologique, méthode statistique

Mots-clés géographiques Agrovoc : Cameroun, Costa Rica, Madagascar, Martinique, France

Mots-clés libres : C-N-P cycling, Functional traits, Legumes, Nematodes, Plant diversification, Tropical soils

Classification Agris : F08 - Systèmes et modes de culture
P35 - Fertilité du sol
U30 - Méthodes de recherche

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

Auteurs et affiliations

• Sauvadet Marie, CIRAD-PERSYST-UPR GECO (MTQ) ORCID: 0000-0002-7520-8565 - auteur correspondant
• Trap Jean, IRD (FRA)
• Damour Gaëlle, CIRAD-PERSYST-UPR GECO (FRA) ORCID: 0000-0001-6080-7306
• Plassard Claude, INRAE (FRA)
• Van Den Meersche Karel, CIRAD-PERSYST-UMR Eco&Sols (FRA) ORCID: 0000-0002-0866-7657
• Achard Raphaël, CIRAD-PERSYST-UPR GECO (FRA)
• Allinne Clémentine, CIRAD-PERSYST-UMR ABSys (FRA)
• Autfray Patrice, CIRAD-PERSYST-UPR AIDA (FRA) ORCID: 0000-0002-3637-7366
• Bertrand Isabelle, INRAE (FRA)
• Blanchart Eric, IRD (FRA)
• Deberdt Peninna, CIRAD-PERSYST-UPR HortSys (FRA)
• Enock Seguy, ICRAF (CMR)
• Essobo Nieboukaho Jean-Daniel, ICRAF (CMR)
• Freschet Grégoire T., CNRS (FRA)
• Hedde Mickaël, INRAE (FRA)
• de Melo Virginio Filho Elias, CATIE (CRI)
• Rabary Bodovololona, FOFIFA (MDG)
• Rakotoarivelo Miora, Université d'Antananarivo (MDG)
• Randriamanantsoa Richard, FOFIFA (MDG)
• Rhino Béatrice, CIRAD-PERSYST-UPR HortSys (MTQ) ORCID: 0000-0002-6119-430X
• Ripoche Aude, CIRAD-PERSYST-UPR AIDA (MDG) ORCID: 0000-0001-6756-9777
• Rosalie Elisabeth, CIRAD-PERSYST-UPR GECO (MTQ)
• Saj Stéphane, CIRAD-PERSYST-UMR ABSys (GUF) ORCID: 0000-0001-5856-5459
• Becquer Thierry, IRD (FRA)
• Tixier Philippe, CIRAD-PERSYST-UPR GECO (FRA) ORCID: 0000-0001-5147-9777
• Harmand Jean-Michel, CIRAD-PERSYST-UMR Eco&Sols (CMR) ORCID: 0000-0002-8065-106X

Source : Cirad-Agritrop (https://agritrop.cirad.fr/598730/)

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