Microbial C/N metabolic capabilities contribute to the fate of crop residue N in plant-soil-microbe continuum over multiple seasons

文献类型： 外文期刊

第一作者： Xie, Zhihuang

作者： Xie, Zhihuang;Xie, Zhihuang;Li, Yansheng;Yu, Zhenhua;Wang, Guanghua;Liu, Xiaobing;Liu, Junjie;Liu, Judong;Jin, Jian;Tang, Caixian;Jin, Jian;Wu, Junjiang;Jin, Jian;Herbert, Stephen J.

作者机构：

期刊名称：ISCIENCE （ 影响因子：4.1； 五年影响因子：4.7 ）

ISSN：

年卷期： 2025 年 28 卷 5 期

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收录情况： SCI

摘要： The mineralization of crop residue-nitrogen (N) is important for sustainable N supply to subsequent crops. However, the microbial mechanisms regarding residue-N mineralization over growth seasons are still unclear. We amended 15N-labelled maize and soybean residues to a Mollisol soil and found that, after three growth seasons, soybean plants utilized 43% and 37% of soybean and maize residue-N, respectively. Approximately 10.5% of soybean and 18.6% of maize residue-N were recovered in the labile N pools in soil. Overtime, 82% of soybean residue-N was mineralized compared with 66% for maize residue-N. Greater increases in abundances of microbial functional genes involved in organic C decomposition, N mineralization, N2 fixation, and denitrification were observed in the soybean residue compared to the maize residue treatment. The study implies that soybean residue amendment may lower fertilizer N input more effectively than maize residue, considering the N balance between crop demand and soil supply in farming Mollisols.

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