Metagenomic insights into the alteration of soil N-cycling-related microbiome and functions under long-term conversion of cropland to Miscanthus

文献类型： 外文期刊

第一作者： Zhao, Chunqiao

作者： Zhao, Chunqiao;Yue, Yuesen;Guo, Qiang;Wu, Juying;Wang, Qinghai;Li, Cui;Hu, Yang;Wang, Sisi;Yuan, Ning;Fan, Ranran;Hou, Xincun;Fan, Xifeng;Song, Jinku;Wang, Zhengang

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关键词： cropland; metagenomic analysis; N-cycling; N fixation; perennial energy crops; soil properties

期刊名称：GLOBAL CHANGE BIOLOGY BIOENERGY （ 影响因子：5.6； 五年影响因子：5.4 ）

ISSN： 1757-1693

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Miscanthus spp. show excellent application prospects due to its bioenergy potential and multiple ecological services. Annual N export with biomass harvest from Miscanthus, even without fertilizer supplement, do not reduce soil N levels. The question arises regarding how Miscanthus can maintain stable soil N levels. Metagenomic strategies were used to reveal soil N-cycling-related microbiome and their functional contributions to processes of soil N-cycling based on the comparison among the bare land, cropland, 10-year Miscanthus x giganteus, and 15-year Miscanthus sacchariflorus fields. The results showed that, after long-term cropland-to-Miscanthus conversion (LCMC), 16 of 21 bacterial phyla and all the archaeal phyla exhibited significant changes. Soil microbial denitrification and nitrification functions were significantly weakened, and N fixation (NF) was significantly enhanced. The biosynthesis of amino acids, especially alanine, aspartate, and glutamate metabolism, in soil N-cycling-related microbiome was dramatically promoted. The genus Anaeromyxobacter contributed largely to the NF process after LCMC. Variations in the soil available potassium, available N, organic C, and total N contents drove a functional shift of soil microbiome from cropland to Miscanthus pattern. We conclude that Miscanthus can recruit Anaeromyxobacter communities to enhance NF benefiting its biomass sustainability and soil N balance.

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