数字农科院2.0

Microbial traits mediate the functional components of soil organic carbon under long-term fertilization

文献类型： 外文期刊

作者： Yuan, Yanhong;Zhang, Jiachang;Feng, Zhanrong;Zhang, Qi;Zhao, Zihan;Li, Qiang;Zhang, Shuiqing;Wei, Gehong;Han, Xinhui;Xu, Minggang;Cai, Andong;Ren, Chengjie;Ren, C.

作者机构：

关键词： Microbial carbon use efficiency;Microbial carbon pump efficacy;Microbial traits;Soil carbon fractions;Long-term fertilization

期刊名称： APPLIED SOIL ECOLOGY

ISSN： 0929-1393

年卷期： 2026 年 219 卷

页码：

收录情况： SCIE（2025版）

摘要： Microbial physiological traits are key determinants of soil organic carbon (SOC) accumulation under long-term fertilization, yet their adaptability to carbon (C) and nutrient gradients, and the corresponding C feedback effects, remain largely unexplored. Here, we conducted a 33-year field experiment with mineral and mineralorganic combined fertilization (NPKM) across two contrasting soil types (nutrient-rich vs. nutrient-poor). The 18O-H2O tracer method and amino sugar biomarker approaches were used to explore the trends of microbial C use efficiency (CUE) and microbial C pump efficacy (MCP), while metagenomic analysis and environmental variables were integrated to clarify the intrinsic and extrinsic effects of long-term fertilization on these microbial traits. Our results revealed divergent responses of SOC fractions to NPKM across soil types: relative to the control (CK), NPKM increased particulate organic carbon (POC) by 130% in nutrient-rich soils, the 33.46% rise in mineral-associated organic carbon (MAOC); in contrast, only MAOC exhibited a significant increase (80.86%) in nutrient-poor soils. Further analysis confirmed that microbial physiological traits drove the changes in POC and MAOC depending on soil nutrient status under long-term fertilization. Specifically, in nutrient-poor soils, NPKM enhanced MAOC by increasing CUE (100%) and MCP (45.34%), an effect mediated by C-degradation functional genes. In nutrient-rich soils, NPKM promoted POC by improving CUE (48.48%), a process regulated by abiotic factors. These findings highlight that initial nutrient levels regulate microbial physiological traits, thereby dictating the accumulation dynamics of different C fractions, which offers a theoretical basis for targeted agricultural C management strategies.

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