Martynenko E., Timofeeva Y.
В журнале Journal of Soils and Sediments
Год: 2025 Том: 25 Страницы: 3058–3077
Purpose This study aimed to investigate the structure and diversity of the bacterial community in soil matrices and Fe‒Mn nodules from natural Luvisols and reveal the potential bacterial involvement in the transformation of different elements in nodules. Materials and methods Soil matrices and Fe‒Mn nodules (sized 2–4 mm) were collected from uncontaminated soil in the National Park "Land of the Leopard" (south of the Russian Far East) and studied using advanced analytical methods. The compositions of the soil matrix and nodule bacterial communities were analysed using high–throughput sequencing technology. Results and discussion We identified 48 phyla, 122 classes, 238 orders, and 316 families of bacteria in the studied soil matrices and nodules. The bacterial diversity and abundance in the studied nodules were lower than those in the soil matrices. The taxonomic compositions of the bacterial communities in the soil matrices and nodules were similar; Proteobacteria, Actinobacteria, and Acidobacteria were the predominant phyla. Thirty–five dominant families were selected to identify the relationships between the main physicochemical parameters of the soil matrices and nodules and the relative bacterial abundances. The same dominant families were associated with different elements in the soil matrix and nodules. Mn–rich, organic compounds, and N–containing compounds were the main factors influencing bacterial diversity and abundance in the nodules. Compared to the soil matrix, the associations of bacteria with Fe–rich compounds in the nodules were not significant. Conclusions The bacterial community identified in the nodules and soil matrix showed metabolic flexibility and adaptability, allowing them to play a significant role in the formation of nodules in the studied soils and in the biogeochemical cycles of Mn, SOC, TN, Fe and related elements in the soil matrix and nodules.
