Divergent regulation of nitrogen cycling genes under long-term organic and chemical fertilization in plateau cropland soils

文献类型： 外文期刊

第一作者： Ma, Yingjun

作者： Ma, Yingjun;Zhang, Keqiang;Shen, Shizhou;Du, Huiying;Du, Lianzhu;Gao, Wenxuan;Ma, Yingjun;Zhang, Keqiang;Shen, Shizhou;Du, Huiying;Liu, Fuyuan;Gao, Xingliang

作者机构：

关键词： Fertilization; Nitrogen and carbon cycling; Genes; Microorganisms; Metagenomics

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 215 卷

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收录情况： SCI

摘要： The fertilization of agricultural soils has a crucial impact on the microbial communities and nutrient cycling within the soil. However, it remains unclear how long-term fertilization regimes regulate microbial-driven carbon (C) /nitrogen (N) processes in agroecosystems, particularly in ecologically vulnerable plateaus. Here, we integrated metagenomics and quantitative polymerase chain reaction techniques to explore fertilizationinduced changes in microbial communities and genes governing C/N cycling, and assessed their linkages to biogeochemical processes in a typical plateau cropland after six-year amendments. The results indicated that among microbial taxa carrying functional genes for C/N cycling, Nocardioides and Phycicoccus were the most significant responses to fertilization. Long-term organic fertilization significantly increased the abundance of genes associated with nitrogen fixation, assimilatory nitrate reduction, and dissimilatory nitrate reduction, enhancing the potential for soil N acquisition and retention, and increasing soil total N content by 47.2 % to 2.84 g kg- 1. And long-term application of chemical fertilizer and combinations of chemical and organic fertilizers both enhanced soil methane oxidation potential via increased the abundance of pmoA/B (by 2.0- to 2.7-fold), yet increased N2O production potential through different pathways: the former promoted incomplete denitrification genes (nirK, norB), while the latter increased nitrification genes (amoA, amoB, nxrB). Additionally, long-term chemical fertilization strengthened the dominance of nar- over nap-mediated nitrate reduction pathways, increasing the narG to napA gene abundance ratio by 85.5 %. In summary, this study revealed the effects of longterm applications of different fertilizer types on the community structures and functions of microorganisms involved in N and C cycling and provides a valuable reference for further understanding of nutrient cycling in agricultural soils.

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