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Fertilizing-induced alterations of microbial functional profiles in soil nitrogen cycling closely associate with crop yield

文献类型： 外文期刊

作者： Li, Ruochen 1 ; Ren, Chengyao 1 ; Wu, Likun 1 ; Zhang, Xinxin 1 ; Mao, Xinyi 1 ; Fan, Zhen 1 ; Cui, Weili 1 ; Zhang, Wu 3 ; Wei, Gehong 1 ; Shu, Duntao 1 ;

作者机构： 1.Northwest A&F Univ, Coll Life Sci, State Key Lab Crop Stress Biol Arid Areas, Yangling 712100, Shaanxi, Peoples R China

2.Shaanxi Key Lab Agr & Environm Microbiol, Yangling 712100, Shaanxi, Peoples R China

3.Heilongjiang Acad Agr Sci, Heihe Branch, Heihe 150086, Heilongjiang, Peoples R China

关键词： Fertilization regimes; Rhizosphere selection; Microbial community; Co-occurrence patterns; Microbial nitrogen-cycling processes; Crop yield

期刊名称：ENVIRONMENTAL RESEARCH （ 影响因子：8.3； 五年影响因子：8.2 ）

ISSN： 0013-9351

年卷期： 2023 年 231 卷

页码：

收录情况： SCI

摘要： Fertilization and rhizosphere selection are key regulators for soil nitrogen (N) cycling and microbiome. Thus, clarifying how the overall N cycling processes and soil microbiome respond to these factors is a prerequisite for understanding the consequences of high inputs of fertilizers, enhancing crop yields, and formulating reasonable nitrogen management strategies under agricultural intensification scenarios. To do this, we applied shotgun metagenomics sequencing to reconstruct N cycling pathways on the basis of abundance and distribution of related gene families, as well as explored the microbial diversity and interaction via high throughput sequencing based on a two-decade fertilization experiment in Loess Plateau of China semiarid area. We found that bacteria and fungi respond divergent to fertilization regimes and rhizosphere selection, in terms of community diversity, niche breadth, and microbial co-occurrence networks. Moreover, organic fertilization decreased the complexity of bacterial networks but increased the complexity and stability of fungal networks. Most importantly, rhizosphere selection exerted more strongly influences on the soil overall nitrogen cycling than the application of fertilizers, accompanied by the increase in the abundance of nifH, NIT-6, and narI genes and the decrease in the abundance of amoC, norC, and gdhA genes in the rhizosphere soil. Furthermore, keystone families screening from soil microbiome (e.g., Sphingomonadaceae, Sporichthyaceae, and Mortierellaceae), which were affected by the edaphic variables, contributed greatly to crop yield. Collectively, our findings emphasize the pivotal roles of rhizosphere selection interacting with fertilization regimes in sustaining soil nitrogen cycling processes in response to decades-long fertilization, as well as the potential importance of keystone taxa in maintaining crop yield. These findings significantly facilitate our understanding of nitrogen cycling in diverse agricultural soils and lay a foundation for manipulating specific microorganisms to regulate N cycling and promote agroecosystem sustainability.

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