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Soil microbial metabolism on carbon and nitrogen transformation links the crop-residue contribution to soil organic carbon

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posted on 04.05.2022, 07:12 authored by Z Xie, Z Yu, Y Li, G Wang, X Liu, Caixian TangCaixian Tang, T Lian, J Adams, J Liu, SJ Herbert, Jian JinJian Jin
The beneficial effect of crop residue amendment on soil organic carbon (SOC) stock and stability depends on the functional response of soil microbial communities. Here we synchronized microbial metagenomic analysis, nuclear magnetic resonance and plant-15N labeling technologies to gain understanding of how microbial metabolic processes affect SOC accumulation in responses to differences in N supply from residues. Residue amendment brought increases in the assemblage of genes involved in C-degradation profiles from labile to recalcitrant C compounds as well as N mineralization. The N mineralization genes were correlated with the C and N accumulation in the particulate and mineral-associated C pools, and plant-derived aliphatic forms of SOC. Thus, the combined C and N metabolic potential of the microbial community transforms residue into persistent organic compounds, thereby increasing C and N sequestration in stable SOC pools. This study emphasizes potential microbially mediated mechanisms by which residue N affects C sequestration in soils.

Funding

The project was funded by the National Natural Science Foundation of China (41771326), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA28020201), Youth Innovation Promotion Association CAS (No. 2019233) and "Touyan" Program of Heilongjiang province. We acknowledge that Mr. Haidong Gu provided technological supports on the metagenomic data analyses.

History

Publication Date

01/12/2022

Journal

npj Biofilms and Microbiomes

Volume

8

Issue

1

Article Number

ARTN 14

Pagination

10p.

Publisher

Springer Nature

ISSN

2055-5008

Rights Statement

© The Author(s) 2022. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article ’ s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article ’ s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons. org/licenses/by/4.0/.