数字农科院2.0

Organic amendment strategies differentially regulate microbial carbon use efficiency: A long-term field study integrating microorganism and enzymatic stoichiometry

文献类型： 外文期刊

作者： Wang, Weiyan;Ding, Shijie;Guo, Tengfei;Xu, Xinpeng;He, Ping;Huang, Shaomin

作者机构：

关键词： Organic amendment;Soil carbon sequestration;Carbon use efficiency;C/N ratio

期刊名称： AGRICULTURE ECOSYSTEMS & ENVIRONMENT

ISSN： 0167-8809

年卷期： 2025 年 397 卷

页码：

收录情况： SCIE（2025版）

摘要： Although organic amendments are widely recognized for enhancing soil carbon sequestration, their effects on microbial carbon use efficiency (CUE) and the underlying mechanisms remain unclear. CUE plays a pivotal role in regulating soil carbon retention, yet its response to different types of organic inputs has not been systematically investigated. In this study, we aimed to elucidate how different organic amendments influence CUE and soil carbon stabilization pathways. A 13-year field experiment was conducted comparing straw (C/N: 68.55-50.34), manure (C/N: 14.80), and combined amendments. Our results demonstrate that all amendments increased soil carbon stocks by 18.3 %-38.7 %, but the dominant carbon stabilization pathways diverged. Straw amendment favored particulate organic carbon (POC), whereas manure amendment enhanced mineral-associated organic carbon (MAOC). Manure amendment also elevated CUE (0.48 +/- 0.19) by promoting growth-oriented carbon allocation and accelerating microbial biomass turnover. In contrast, straw amendment suppressed CUE, largely due to microbial nitrogen limitation. This was supported by enzyme activity vector analysis (vector angle<45 degrees) and threshold elemental ratio analysis (R-C:N/TERC:N>0). Additionally, the fungal taxa Agaricomycetes and Mortierellomycota were significantly associated with nitrogen-stressed conditions, indicating their potential as biomarkers of N limitation. This study provides mechanistic insights into how amendment quality shapes soil carbon stabilization and offers a framework for optimizing organic amendment strategies to enhance carbon retention and climate resilience in agricultural soils.

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