Short-Term PE Generation Processes in the Soils of a Farmer Plots Network in the Madagascar Highlands: Actors and Drivers
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Published:2023-10-27
Issue:4
Volume:14
Page:1702-1719
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ISSN:2036-7481
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Container-title:Microbiology Research
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language:en
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Short-container-title:Microbiology Research
Author:
Razanamalala Kanto1, Razafimbelo Tantely1, Maron Pierre-Alain2, Ranjard Lionel2, Chemidlin Prévost-Bouré Nicolas2ORCID, Dequiedt Samuel2, Becquer Thierry3ORCID, Trap Jean3ORCID, Blanchart Eric13ORCID, Bernard Laetitia13ORCID
Affiliation:
1. Laboratoire des Radio-Isotopes, Université d’Antananarivo, BP 3383, Route d’Andraisoro, Antananarivo 101, Madagascar 2. Agroécologie, INRAE, AgroSup Dijon, Université Bourgogne Franche-Comté, 21000 Dijon, France 3. Eco&Sols, Institut Agro, Université de Montpellier, IRD, INRAE, CIRAD, 34394 Montpellier, France
Abstract
Carbon sequestration in agricultural soils, through the accumulation of high-quality organic matter, represents great potential to mitigate climate change and simultaneously improve soil fertility. Such a challenge is particularly important and relevant in developing tropical countries like Madagascar, where soil carbon storage is vulnerable to climatic variations and where fertilization is generally applied through amendments in organic matter of various origins. The priming effect (PE) is considered here as the stimulation of the mineralization of soil organic matter (SOM) by a supply of fresh organic matter (FOM). PE results from different microbial processes driven by specific biotic and abiotic parameters. Depending on the processes involved, it has been suggested that PE could either counteract SOM accumulation or promote it. The objective of the present study was to explore the relationships between certain agricultural practices (type of crop, quality of fertilization, association with trees), the potential intensity of PE, as well as several abiotic (texture, quantity and quality SOM, nutrient enrichment) a1nd biotic (biomass and phylogenetic composition of microbial communities) factors which have been proposed in the literature as specific determinants of the different PE generation mechanisms. The soils for this study come from a network of farms in a commune in the Highlands of Madagascar. The PE, generated by a supply of 13C-enriched wheat straw, could not directly correlate with agricultural treatments. However, several indirect correlations could be found via several specific abiotic and microbial determinants that are discussed in terms of soil fertility restoration.
Funder
French Foundation for Research on Biodiversity French National Institute of Research for Development Agropolis Foundation French Ministry of Foreign Affairs
Subject
Microbiology (medical),Molecular Biology,Microbiology
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