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Background and aims <p>Exogenous organic matter input into the soil may either expedite or postpone the soil organic matter decomposition, resulting in a beneficial or detrimental "priming effect" (PE), in which soil microbes have a crucial function. Notably, a succession of fungal communities were detected during PE, indicating that fungi play a substantial role in influencing PE. However, the assembly processes that shape fungal community composition during PE require further investigation.</p> Methods <p>We conducted residue decomposition experiments by adding C<sub>4</sub> maize straw (natural <sup>13</sup>C-labelling substrates) to C<sub>3</sub> soil (<sup>13</sup>C non-enriched) that was amended for 120&#xa0;days (d) to investigate the PEs dynamics associated with the succession of fungi detected by high-throughput sequencing techniques.</p> Results <p>Our outcomes demonstrated that during the initial 10 d of incubation, the addition of residue resulted in negative PE, regardless of whether N was applied or not. However, a positive PE was observed after 30 d. Nitrogen alone increased total CO<sub>2</sub> emissions of soil compared to the control throughout the incubation interval. The composition of the fungal community shifts from copiotrophic populations in the early stages to oligotrophic populations in the later stages during straw decomposition. Null model analyses revealed that deterministic processes (homogeneous selection) regulated fungal community composition across decomposition stages, whereas stochastic processes (homogeneous dispersal) increased with decomposition. The origin of carbon straw determines the assembly mechanisms that impact the makeup of fungal communities and, thereafter, the process of breakdown.</p> Conclusion <p>Our findings suggested that the assembly processes might be associated with PE by modulating fungal community composition during straw decomposition, including a combination of stochastic and deterministic processes. A comprehensive perspective of the fungal community structure can deepen the understanding of PE under the straw amendment.&#xa0;</p>

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The fungal community assembly was governed by deterministic selection during priming effects induced by residue addition

  • 期刊论文

  • 发表日期：

    2025年2月12日

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  • Xianheng Fu,
  • Jiaxin Li,
  • Xiaofeng Kang,
  • Huaihai Chen,
  • Shiqing Li

摘要

Background and aims

Exogenous organic matter input into the soil may either expedite or postpone the soil organic matter decomposition, resulting in a beneficial or detrimental "priming effect" (PE), in which soil microbes have a crucial function. Notably, a succession of fungal communities were detected during PE, indicating that fungi play a substantial role in influencing PE. However, the assembly processes that shape fungal community composition during PE require further investigation.

Methods

We conducted residue decomposition experiments by adding C4 maize straw (natural 13C-labelling substrates) to C3 soil (13C non-enriched) that was amended for 120 days (d) to investigate the PEs dynamics associated with the succession of fungi detected by high-throughput sequencing techniques.

Results

Our outcomes demonstrated that during the initial 10 d of incubation, the addition of residue resulted in negative PE, regardless of whether N was applied or not. However, a positive PE was observed after 30 d. Nitrogen alone increased total CO2 emissions of soil compared to the control throughout the incubation interval. The composition of the fungal community shifts from copiotrophic populations in the early stages to oligotrophic populations in the later stages during straw decomposition. Null model analyses revealed that deterministic processes (homogeneous selection) regulated fungal community composition across decomposition stages, whereas stochastic processes (homogeneous dispersal) increased with decomposition. The origin of carbon straw determines the assembly mechanisms that impact the makeup of fungal communities and, thereafter, the process of breakdown.

Conclusion

Our findings suggested that the assembly processes might be associated with PE by modulating fungal community composition during straw decomposition, including a combination of stochastic and deterministic processes. A comprehensive perspective of the fungal community structure can deepen the understanding of PE under the straw amendment.