Long-term effects of nitrogen fertilization and Bradyrhizobium inoculation on diazotrophic community structure and diversity in soybean cultivation

文献类型： 外文期刊

第一作者： Wei, Wanling

作者： Wei, Wanling;Ma, Mingchao;Jiang, Xin;Fan, Fenliang;Cao, Fengming;Chen, Huijun;Guan, Dawei;Li, Li;Li, Jun;Ma, Mingchao;Jiang, Xin;Cao, Fengming;Li, Li;Li, Jun;Meng, Fangang

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关键词： Diazotrophs; Bradyrhizobium; nifH gene; Soil diversity

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：5.0； 五年影响因子：5.4 ）

ISSN： 0929-1393

年卷期： 2025 年 206 卷

页码：

收录情况： SCI

摘要： Aims: Diazotrophs are crucial for sustainable agriculture by converting atmospheric dinitrogen into plant-usable nitrogen through biological nitrogen fixation. Understanding how different agricultural practices affect diazotrophic communities can provide valuable insights for optimizing nitrogen management in crop production. Methods: Here, we employed the nifH gene as a molecular marker to assess the impact of 10 years of nitrogen fertilization and Bradyrhizobium inoculation on diazotrophic community structure. Treatments included no fertilization (CK), phosphorus plus potassium (PK), PK plus urea (PK + N), and PK plus Bradyrhizobium japonicum 5821 (PK + R). Results: At soybeans flowering-podding stage, Bradyrhizobium inoculation increased nifH gene copies but decreased the Shannon index in both bulk and rhizosphere soils compared to nitrogen fertilization. At maturity, Bradyrhizobium inoculation reduced nifH gene copies while increasing the Shannon index in both bulk and rhizosphere soils. Bradyrhizobium inoculation lowered beta diversity in the rhizosphere during the floweringpodding but increased it in mature bulk soil. The dominant diazotrophic genera were Bacillus, Azohydromonas, and Skermanella. Bradyrhizobium inoculation enhanced Bacillus abundance during flowering-podding but reduced it while boosting Azohydromonas and Skermanella during maturity. Overall, Bradyrhizobium inoculation decreased network complexity but increased diazotrophic dynamics compared to nitrogen fertilization. Conclusions: Long-term Bradyrhizobium inoculation fosters diazotrophic interactions more effectively than nitrogen fertilization.

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