数字农科院2.0

Effects of fertilization regimes on active microbial groups in photosynthetic carbon utilization

文献类型： 外文期刊

作者： Siyu Zhang;Hui Wang;Hao Zhang;Na Jiang;Jianning Zhao;Haifang Zhang;Dianlin Yang

作者机构：

关键词： 13CO2 pulse labeling;Carbon allocation;Fertilization;PLFAs;Rhizodeposited C

期刊名称： Geoderma

ISSN： 0016-7061

年卷期： 2025 年 463 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Fertilization is an essential management method to maintain and increase soil carbon (C) in agroecosystems, while the role of soil microbes in rhizodeposited C utilization remains largely unknown. We conducted in-situ 13CO2 pulse labeling to track the newly fixed photosynthetic 13C from maize (Zea mays L.) to soil and rhizodeposited C utilization by soil microbes under five-year of fertilization regimes, including no fertilizer as a control (CK), organic fertilizer (M), inorganic fertilizer (NPK), and organic–inorganic fertilizer (MNPK), respectively. We measured the 13C incorporated into plant, soil and phospholipid fatty acids (13C-PLFAs) on days 1, 7, and 21 after labeling to determine the 13C partitioning in the plant-soil system and utilized by different microbial groups. The findings indicated that MNPK and NPK treatments significantly increased the net 13C incorporation into shoots, roots, and soil compared to CK and M treatments, due to larger biomass, higher available phosphorus, and nitrate nitrogen. The MNPK treatment significantly enhanced fungal 13C assimilation (particularly in the 18:2ω6c biomarker), increasing the fungi-to-bacteria (F:B) ratio over sampling time. MNPK showed a higher F:B ratio than NPK on day 21, with total soil 13C retention positively correlating with this ratio in later stages. The CK treatment exhibited greater 13C assimilation in PLFA on day 1, suggesting more active initial photosynthetic C utilization of microbes. M fertilizer application decreased the 13C-PLFA, while increasing the 13C incorporated in G- bacteria during photosynthetic C utilization. Our findings clarify the functional partitioning of rhizodeposited C utilization among distinct microbial guilds, revealing that organic–inorganic fertilization promotes fungal-mediated processes during late decomposition. These insights advance the understanding of microbial-mediated C cycling under different fertilization regimes.

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