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Poster De Conférence Année : 2017

Plant cover preserves the functional diversity of N-fertilization sorted soil bacterial communities in ploughing system

Résumé

Intensive agriculture, using high inputs such as nitrogen (N) fertilizers, pesticides and soil tillage provides sufficient food production but at the expense of biodiversity and ecosystem integrity. In this context, a shift of farming paradigm is needed to meet the global food demand and the challenge of a sustainable agriculture. Earlier studies of ploughing systems revealed that N-fertilization strongly reduces carbon (C) and N contents of the topsoil layer (upper 10 cm), as well as the bacterial diversity. In addition, the incorporation of a permanent plant cover (PPC) between two main crops increases organic C and N inputs, thus mitigates the negative impact of N-fertilization and stabilizes both soil C and N contents and bacterial diversity, while maintaining high yields. To go further, we here assess the taxonomic and functional diversity of bacterial communities in the three following soil layers: topsoil (0-10 cm); between the topsoil and the plowing limit (10-30 cm); below the plowing limit (30-50 cm). We used chemical analyses, high-throughput sequencing and community level physiological profiles approaches. Then results were analyzed by Hierarchical clustering (Ward's method), Co-inertia analyses (CoIA) and heatmap based on CoIA is proposed as a synthetic view of the link between farming practices, bacterial community structure and functional diversity.
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Dates et versions

hal-04278018 , version 1 (09-11-2023)

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Abdelrahman Alahmad, Fabien Spicher, Guillaume Decocq, Ahmad Kobeissi, Thierry Tetu, et al.. Plant cover preserves the functional diversity of N-fertilization sorted soil bacterial communities in ploughing system. 23rd International Scientific Conference LAAS « Research and Science in the Service of Humanity », Apr 2017, Beirut, Lebanon. 2017, ⟨10.13140/RG.2.2.18239.89763⟩. ⟨hal-04278018⟩
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