Converting upland to paddy fields alters soil nitrogen microbial functions at different depths in black soil region

文献类型： 外文期刊

第一作者： Li, Bin

作者： Li, Bin;Zhu, Dan;Liu, Xiaoqian;Yan, Bohan;Mao, Lina;Li, Xin;Li, Jingyang;Zhang, Mengmeng;Wang, Yue;Li, Xin

作者机构：

关键词： Land use conversion; Nitrogen cycling processes; Functional genes; Microbial community

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：6.0； 五年影响因子：6.4 ）

ISSN： 0167-8809

年卷期： 2024 年 372 卷

页码：

收录情况： SCI

摘要： Due to intensified land use, soil nitrogen cycling (N-cycling) and its ecological role are undergoing profound changes on a global scale. Currently, it is not clear how microbial involvement in nitrogen transformation is affected by land use conversion, including microbial diversity and environmental functions, which hinders the development of effective land management strategies. This study focused on microbial-mediated nitrogen cycling in converted black soil, transitioning from upland with maize to paddy with rice fields at two soil depths (0-15 cm and 15-30 cm). Functional gene (nifH, AOA, AOB, norB, and nosZ) abundances and critical functional groups were assessed using quantitative polymerase chain reaction (qPCR) and Miseq sequencing. There were significant disparities in N-cycling gene abundance and microbial communities between paddy and upland fields at both soil depths, with these differences being influenced by soil properties. Notably, land use emerged as a more influential factor than soil depth in reshaping N-cycling abundance and microbial communities. Soil pH, soil moisture (SM), and nitrate nitrogen (NO3- -N) content primarily influenced variations in the N-cycling microbial community structure. The rise in ecological niche resulted in a decrease in species migration of denitrifying communities, as confirmed by estimated migration rates (M). Land use conversion induced a transition from stochastic to deterministic processes in the assembly of norB- and nosZ-harbouring communities at deeper depths, primarily governed by heterogeneous selection. This conversion led to increased diversity and network stability within the nifH-, norB-, and nosZ-harbouring communities. In upland and paddy fields, the nosZ- and nifH-harbouring communities emerged as major players in the multi-kingdom networks, respectively. These results suggest that paddy ecosystems should be regarded as suitable environments for improving soil N-cycling functions in the context of agroecosystems facing severe environmental changes.

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