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Background and aims <p>Litter decomposition is a vital carbon (C) cycling process in mangroves. Yet, a major gap is the lack of a pairing understanding of the factors driving leaf and fine root decomposition. We aimed to investigate the effects of mangrove habitat location, species, and soil depth on litter decomposition, and evaluate the role of chemical traits throughout decomposition.</p> Methods <p>We conducted field litterbag experiments on leaf and fine root litter for 120 and 360&#xa0;days in an estuarine mangrove, respectively. Litter mass and chemical traits were measured.</p> Results <p>Mangrove habitat location had no effect on litter decomposition. The effect of species on leaf decomposition rate depended on spatial scale, but not so for fine roots. The dynamics of concentrations and remaining amounts of chemical components differed between leaf and fine root litter. Compared to <i>Avicennia marina</i>, <i>Kandelia obovata</i> leaf litter showed higher C and acid-detergent lignin (ADL) remaining but lower condensed tannins (CTs) remaining. <i>K. obovata</i> fine root litter retained more total phenols (TPs) than <i>A. marina</i>, whereas ADL remaining was lower for <i>K. obovata</i>. The TPs, CTs, acid-detergent cellulose, and mass remaining of fine root litter were higher in subsoil than in topsoil. Chemical traits were key factors controlling litter mass variation during decomposition, especially for leaves.</p> Conclusions <p>Our results underscore the roles of species, litter type, soil depth, and chemical traits in litter decomposition, and further suggest that these factors may promote soil C sequestration through the loss of extractable phenolic compounds and low decomposition rate.</p>

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Divergent dynamics and drivers of mass remaining and chemical traits during leaf and fine root litter decomposition in a Chinese estuarine mangrove: Implications for soil carbon sequestration

  • 期刊论文

  • 发表日期：

    2025年9月30日

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  • Shuo Yin,
  • Yihan Wang,
  • Huibo Ren,
  • Jin Chen,
  • Biao Zhu,
  • Hui Zeng

摘要

Background and aims

Litter decomposition is a vital carbon (C) cycling process in mangroves. Yet, a major gap is the lack of a pairing understanding of the factors driving leaf and fine root decomposition. We aimed to investigate the effects of mangrove habitat location, species, and soil depth on litter decomposition, and evaluate the role of chemical traits throughout decomposition.

Methods

We conducted field litterbag experiments on leaf and fine root litter for 120 and 360 days in an estuarine mangrove, respectively. Litter mass and chemical traits were measured.

Results

Mangrove habitat location had no effect on litter decomposition. The effect of species on leaf decomposition rate depended on spatial scale, but not so for fine roots. The dynamics of concentrations and remaining amounts of chemical components differed between leaf and fine root litter. Compared to Avicennia marina, Kandelia obovata leaf litter showed higher C and acid-detergent lignin (ADL) remaining but lower condensed tannins (CTs) remaining. K. obovata fine root litter retained more total phenols (TPs) than A. marina, whereas ADL remaining was lower for K. obovata. The TPs, CTs, acid-detergent cellulose, and mass remaining of fine root litter were higher in subsoil than in topsoil. Chemical traits were key factors controlling litter mass variation during decomposition, especially for leaves.

Conclusions

Our results underscore the roles of species, litter type, soil depth, and chemical traits in litter decomposition, and further suggest that these factors may promote soil C sequestration through the loss of extractable phenolic compounds and low decomposition rate.