%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Lima, A. V.
%A da Costa, D. P.
%A Duda, G. P.
%A de Barros, J. A.
%A Santos, R. D.
%A da Mota, S. E. O.
%A Lima, J. R. D.
%A da Silva, V. P.
%A Lopes, M. H. L.
%A Hammecker, Claude
%A Pereira, A. P. D.
%A Mendes, L. W.
%A Araujo, A. S. F.
%A de Medeiros, E. V.
%T Nutrient enrichment by poultry biochar reshapes soil microbial networks, reducing interaction complexity in tropical sandy soils
%D 2026
%L fdi:010096330
%G ENG
%J Journal of Soil Science and Plant Nutrition
%@ 0718-9508
%K Biocarbon ; Phaseolus vulgaris ; Soil microbiome ; Organic amendments ; Co-occurrence networks ; Microbial diversity
%K BRESIL
%M ISI:001682315700001
%P [12 ]
%R 10.1007/s42729-026-03005-1
%U https://www.documentation.ird.fr/hor/fdi:010096330
%> https://www.documentation.ird.fr/intranet/publi/2026-03/010096330.pdf
%V [Early access]
%W Horizon (IRD)
%X Purpose This study evaluated how poultry manure-derived biochar influences the structure, diversity, and co-occurrence networks of soil bacterial communities in nutrient-poor tropical sandy soils. We examined the trade-off between improved soil fertility and potential simplification of microbial networks, testing the hypothesis that high biochar rates would enhance nutrient availability but reduce microbial complexity and diversity. Methods A field experiment was conducted over two years in sandy soils of northeastern Brazil, applying poultry biochar. We used six treatments: (a) control (no amendments), (b) low-rate biochar (Bio_10t = 10 t ha(-1)), (c) high-rate biochar (Bio_40t = 40 t ha(-1)), (d) chicken manure (E.Av = 5 t ha(-1)), (e) synthetic mineral fertilizer (Mineral = NPK), and (f) poultry manure (C.Av = 10 t ha(-1)). Soil chemical properties were assessed, and bacterial communities were analyzed using 16 S rRNA gene sequencing. Network analyses were performed using SparCC and NetCoMi, and multivariate statistics determined key environmental drivers. Results High biochar inputs increased organic C, P, and K levels, leading to a distinct shift in microbial community structure. However, this nutrient enrichment reduced amplicon sequence variants richness by 22.4% (from 3,250 to 2,521) and Shannon diversity by 3.6% (from 7.16 to 6.90) relative to the control. Network analysis showed substantial simplification of microbial interactions: the control treatment had 3,116 co-occurrence edges, which fell to 1,423 under low biochar (Bio_10t) and 1,849 under high biochar (Bio_40t)-reductions of 54% and 40%, respectively. Conclusions Our findings underscore a trade-off: while poultry biochar effectively enhances soil fertility, excessive application may disrupt microbial diversity and interaction networks, potentially compromising long-term soil resilience. These results highlight the need to optimize biochar rates to balance immediate fertility gains with preservation of microbial ecological stability in fragile sandy soils. [GRAPHICS] .
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