The Contribution of Microorganisms to Soil Organic Carbon Accumulation under Fertilization Varies among Aggregate Size Classes

文献类型： 外文期刊

第一作者： Lu, Jinjing

作者： Lu, Jinjing;Zhang, Qiang;Gao, Chunhua;Li, Jianhua;Jin, Dongsheng;Lu, Jinjing;Li, Shengping;Wu, Xueping;Zheng, Fengjun;Zhang, Mengni;Abdelrhman, Ahmed Ali;Lu, Jinjing;Li, Shengping;Degre, Aurore;Liang, Guopeng

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关键词： fertilization; soil aggregates; microbial properties; enzyme activity; SOC

期刊名称：AGRONOMY-BASEL （ 影响因子：3.949； 五年影响因子：4.117 ）

ISSN：

年卷期： 2021 年 11 卷 11 期

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收录情况： SCI

摘要： Long-term fertilization alters soil microbiological properties and then affects the soil organic carbon (SOC) pool. However, the interrelations of SOC with biological drivers and their relative importance are rarely analyzed quantitatively at aggregate scale. We investigated the contribution of soil microbial biomass, diversity, and enzyme activity to C pool in soil aggregate fractions (>5 mm, 2-5 mm, 1-2 mm, 0.25-1 mm, and <0.25 mm) at topsoil (0-15 cm) from a 27-year long-term fertilization regime. Compared to CK (no fertilization management), NP (inorganic fertilization alone) decreased all of the microbial groups' biomass, while NPS and NPM (inorganic fertilization plus the incorporation of maize straw or composted cow manure) significantly reduced this negative effect of NP on microbial biomass and increased the microbial contribution to C pool. The results show that microbial variables were significantly correlated with SOC content in >0.25 mm aggregates rather than in <0.25 mm aggregates. Fungal variables (fungal, AM biomass, and F/B ratio) and enzyme activities (BXYL and LAP) in >0.25 mm aggregates explained 21% and 2% of C, respectively. Overall, organic matter addition could contribute to higher C storage by boosting fungal community and enzyme activity rather than by changing microbial community diversity in macro-aggregates.

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