Soil Microbial Functions Affecting Soil Carbon Cycling

A special issue of Agronomy (ISSN 2073-4395). This special issue belongs to the section "Soil and Plant Nutrition".

Deadline for manuscript submissions: 31 August 2026 | Viewed by 1093

Special Issue Editor


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Guest Editor
College of Resources, Hunan Agricultural University, No. 1 Nongda Road, Furong District, 410125 Changsha, China
Interests: soil organic carbon; soil microorganisms; soil C-N coupling; soil health

Special Issue Information

Dear Colleagues,

Soil carbon cycling is a critical for mitigating climate change, ensuring global food security, and maintaining ecosystem resilience. Despite its importance, the microbial mechanisms that underpin the formation, stabilization, and persistence remain poorly understood, posing a significant challenge to predicting and managing soil carbon dynamics under global change.

This Special Issue aims to address this knowledge gap by highlighting cutting-edge research on the functions of soil microorganisms in regulating soil carbon cycling. We seek contributions that elucidate the microbial processes governing soil carbon stability across diverse ecosystems, land-use types, and management regimes. The Issue will foster a mechanistic understanding of how microbial community composition, functional gene, metabolic activity, and interactions influence the long-term fate of soil carbon.

Topics of interest include, but are not limited to, the following:

  1. Microbial responses to global change drivers and their consequent effects on soil carbon persistence.
  2. The role of microbial characteristics associated with soil management practices that modify the soil carbon cycling.
  3. The influence of coupled biogeochemical cycles (e.g., C-N, C-Fe) on soil carbon cycling mediated by key microbial taxa and functional genes.
  4. Microbial processes governing the dynamics of distinct soil carbon fractions from micro to macro scales.

Types of Papers Solicited:

Original Research Articles (presenting novel experimental or field data).

Comprehensive Reviews (systematic and critical assessments of the current state of knowledge).

Case Studies (in-depth analyses of specific management practices or ecosystems).

Short Communications (concise reports of significant preliminary findings).

Prof. Dr. San'an Nie
Guest Editor

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Keywords

  • soil organic carbon (SOC)
  • microbial community
  • carbon sequestration
  • soil aggregation
  • soil management
  • carbon–nitrogen coupling
  • carbon–iron coupling

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Published Papers (1 paper)

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Research

20 pages, 8059 KB  
Article
Shifts in Fertilization Regime Alter Carbon Cycling in Paddy Soils: Linking the Roles of Microbial Community, Functional Genes, and Physicochemical Properties
by Yuxin Wang, Qinghong Gao, Tao Wang, Geng Sun and San’an Nie
Agronomy 2026, 16(1), 104; https://doi.org/10.3390/agronomy16010104 - 31 Dec 2025
Viewed by 731
Abstract
Fertilization regimes impact the carbon cycle processes in paddy soils. However, the effects of shifting fertilization regimes on the structure of microbial communities and functional genes involved in soil carbon (C)-cycling remain unclear. A long-term field experiment was established with three paired fertilization [...] Read more.
Fertilization regimes impact the carbon cycle processes in paddy soils. However, the effects of shifting fertilization regimes on the structure of microbial communities and functional genes involved in soil carbon (C)-cycling remain unclear. A long-term field experiment was established with three paired fertilization shift treatments: chemical fertilizer (CF) and CF to normal-rate organic fertilizer (CF-NOM); normal-rate organic fertilizer (NOM) and NOM to CF (NOM-CF); high-rate organic fertilizer (HOM) and HOM to CF (HOM-CF). Metagenomic sequencing and bioinformatics analysis were employed to investigate the effects of fertilization shifts on soil C-cycling microbial community structure, functional genes, and environmental factors. The results showed that compared to CF treatment, CF-NOM significantly increased soil organic carbon (SOC), mineral-associated organic carbon (MAOC), particulate organic carbon (POC), microbial biomass carbon (MBC), dissolved organic carbon (DOC), and the emissions of CO2 and CH4 (p < 0.05). The NOM-CF led to significant reductions in MAOC, MBC, DOC, and CO2 and CH4 emissions. The HOM-CF shift caused significant decreases in SOC, MAOC, POC, MBC, DOC, and CO2 and CH4 emissions. Fertilization shifts had no significant effect on the α-diversity of C-cycling microbial communities (p > 0.05), but β-diversity showed a significant restructuring of community composition. Network analysis indicated that fertilization shifts increased positive microbial correlations while reducing network modularity. C-cycling functional genes responded sensitively to fertilization disturbances, especially key genes in the carbon fixation pathway (cdhDE, cooS). Redundancy analysis indicated that soil bulk density (BD) and POC are key environmental factors regulating functional differences in carbon metabolism, which collectively influenced microbial community structure and functional gene abundance along with other factors. We concluded that the C-cycling process in paddy soil was greatly altered by shifts in fertilization regimes, influenced by microbial diversity, functional genes, and network structure linked to soil characteristics. Full article
(This article belongs to the Special Issue Soil Microbial Functions Affecting Soil Carbon Cycling)
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