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Purpose <p>Global climate change has increased extreme rainfall events, leading to hiked soil moisture, Mn mobility and concomitant Mn phytotoxicity in acidic soils. Mn toxication in litchi after extreme rainfall has been frequently observed in southern China to date. This study investigated the dynamics of soil properties in waterlogged soils, with the aim to identify the dominant soil attributes regulating Mn bioavailability after heavy rainfall.</p> Methods <p>A 20-day incubation experiment with three acidic litchi orchard soils (Soil H, Soil S and Soil A) was conducted under aerobic and flooded conditions. Soil pH, Eh, Mn species, and microbial community composition were monitored, and the relation among them was calculated.</p> Results <p>Waterlogging significantly reduced soil Eh but increased pH. Soil water-soluble Mn (WS-Mn), exchangeable Mn (EXC-Mn), and carbonate-bound Mn sharply increased, whereas easily reducible Mn decreased. Waterlogging reduced the abundance of <i>Burkholderia-Caballeronia-Paraburkholderia</i> in Soil H, Mn-oxidizing bacterium <i>Massilia</i> (Soil S) and <i>Sinomonas</i> in Soil A, but increased <i>Noviherbaspirillum</i> in Soil S. Correlation and redundancy analysis reveal that soil WS-Mn and/or EXC-Mn showed positive correlation with <i>Noviherbaspirillum</i>, and negative association with <i>Burkholderia-Caballeronia-Paraburkholderia</i>, <i>Massilia</i> and <i>Sinomonas</i>. The contributions to Mn speciation of <i>Burkholderia-Caballeronia-Paraburkholderia</i>, <i>Noviherbaspirillum and Massilia</i>,<i> and Sinomonas</i> accounted for 57.30%, 96.00% and 72.60% in Soil H, Soil S and Soil A respectively, suggesting their potential role in Mn bioavailability.</p> Conclusion <p>The association between microbial genus dynamics and Mn mobility in waterlogged soil suggests the probability to mitigate Mn phytotoxicity by applying specific microbial agents in acid soils sub ject to extreme precipitation.</p>

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Soil moisture promotes manganese bioavailability via alteration of soil microbial community

  • 期刊论文

  • 发表日期：

    2026年2月5日

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  • Huiting Xu,
  • Huan Liu,
  • Peng Jin,
  • Laixin Cao,
  • Silin Liu,
  • Cuihua Bai,
  • Lixian Yao

摘要

Purpose

Global climate change has increased extreme rainfall events, leading to hiked soil moisture, Mn mobility and concomitant Mn phytotoxicity in acidic soils. Mn toxication in litchi after extreme rainfall has been frequently observed in southern China to date. This study investigated the dynamics of soil properties in waterlogged soils, with the aim to identify the dominant soil attributes regulating Mn bioavailability after heavy rainfall.

Methods

A 20-day incubation experiment with three acidic litchi orchard soils (Soil H, Soil S and Soil A) was conducted under aerobic and flooded conditions. Soil pH, Eh, Mn species, and microbial community composition were monitored, and the relation among them was calculated.

Results

Waterlogging significantly reduced soil Eh but increased pH. Soil water-soluble Mn (WS-Mn), exchangeable Mn (EXC-Mn), and carbonate-bound Mn sharply increased, whereas easily reducible Mn decreased. Waterlogging reduced the abundance of Burkholderia-Caballeronia-Paraburkholderia in Soil H, Mn-oxidizing bacterium Massilia (Soil S) and Sinomonas in Soil A, but increased Noviherbaspirillum in Soil S. Correlation and redundancy analysis reveal that soil WS-Mn and/or EXC-Mn showed positive correlation with Noviherbaspirillum, and negative association with Burkholderia-Caballeronia-Paraburkholderia, Massilia and Sinomonas. The contributions to Mn speciation of Burkholderia-Caballeronia-Paraburkholderia, Noviherbaspirillum and Massilia, and Sinomonas accounted for 57.30%, 96.00% and 72.60% in Soil H, Soil S and Soil A respectively, suggesting their potential role in Mn bioavailability.

Conclusion

The association between microbial genus dynamics and Mn mobility in waterlogged soil suggests the probability to mitigate Mn phytotoxicity by applying specific microbial agents in acid soils sub ject to extreme precipitation.