Microbial community structure and nitrogen cycling in an area affected by the tailings dam collapse under a rehabilitation process

IF 4.8 2区农林科学 Q1 SOIL SCIENCE

Applied Soil Ecology Pub Date : 2025-03-24 DOI:10.1016/j.apsoil.2025.106045

Letícia de Souza Ferreira , Helena Santiago Lima , Alex Gazolla de Castro , Karen Braathen de Carvalho , Wiane Meloni Silva , Isabelle Gonçalves de Oliveira Prado , Igor Rodrigues de Assis , Diego Aniceto , Maria Catarina Megumi Kasuya , Sergio Oliveira de Paula , Cynthia Canêdo da Silva

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Abstract

The rehabilitation of areas affected by iron ore tailings has significantly altered soil properties and microbial communities (p < 0.05). This study examines the recovery of bacterial communities and nitrogen cycling in two rehabilitated areas impacted by the B1 dam rupture: DA1, a stream channel area with significant engineering intervention, and DA2, near a forest with minimal intervention. Using microbial 16S rRNA gene sequencing we found that Pseudomonadota, Actinobacteriota, Acidobacteriota, Chloroflexota, and Gemmatimonadota represent about 71 % of the total bacteria abundance in rehabilitated areas, we also identified 7 bacterial genera (Terrabacter, Neo b11, Qipengyuania, Curtobacterium, Terriglobus, Parasegetibacter and Rhodopseudomonas) as biomarkers for DA1, 3 (Clostridium, Ensifer and Lacibacter) for DA2, and 8 (Fodinicola, Roseiarcus, Acidipila, Candidatus Udaeobacter, Planotetraspora, Mycobacterium and Clade Ia) for a reference (REF) area. Genera in DA2 and REF were associated with nutrient cycling and plant growth, while DA1 displayed a wider range of metabolisms and degradation capacities. Microbial network analysis revealed more complex networks in rehabilitated areas DA1 (nodes = 3.186; edges = 6.480) DA2 (nodes = 3.224; edges = 6.521) than the reference (nodes = 2.175; edges = 3.020). Nitrogen cycle-related genera were present in both areas, with no significant difference (p > 0.05) in the abundance of nifH, narG and amoA genes, suggesting that technosol supports efficient nitrogen cycling recovery. Overall, the study demonstrates microbial structure and function recovery in impacted areas, with technosol playing a beneficial role, even in regions with complex engineering needs. These findings highlight the potential of technosol for future environmental recovery efforts following dam collapses, motivating us to continue our research and innovation in this field.

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来源期刊

Applied Soil Ecology 农林科学-土壤科学

CiteScore

9.70

自引率

4.20%

发文量

363

审稿时长

5.3 months

期刊介绍： Applied Soil Ecology addresses the role of soil organisms and their interactions in relation to: sustainability and productivity, nutrient cycling and other soil processes, the maintenance of soil functions, the impact of human activities on soil ecosystems and bio(techno)logical control of soil-inhabiting pests, diseases and weeds.