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Background <p>Salt marsh soil organic carbon (SOC) is a key component of “blue carbon” and crucial to the global carbon cycle. The influence of different vegetation types on SOC fractions and stability along soil profiles remains unclear, limiting the assessment of carbon sequestration potential.</p> Methods <p>Study sites were established in three typical vegetation zones (<i>Tamarix chinensis</i>, <i>Phragmites australis</i>, <i>Suaeda salsa</i>) and a bare tidal flat in the Yellow River Estuary salt marsh<i>.</i> By quantifying SOC fractions—particulate (POC) and mineral-associated organic carbon (MAOC)—and integrating these data with plant traits and soil properties, we investigated the distribution patterns of SOC fractions in topsoil (0–30&#xa0;cm) and subsoil (30–100&#xa0;cm) and the mechanisms regulating SOC stability (MAOC/POC ratio).</p> Results <p>SOC fractions and stability differed significantly among vegetation types and soil depths. <i>P. australis</i> had the highest SOC and MAOC contents, whereas <i>T. chinensis</i> had the highest POC stock. Although the bare tidal flat had the lowest SOC content, it exhibited the highest topsoil MAOC/POC ratio. Overall, the POC and MAOC contents, as well as the MAOC/POC ratio, were higher in topsoil than in subsoil. Topsoil MAOC/POC ratio was negatively regulated with plant traits, whereas subsoil MAOC/POC ratio was positively regulated to soil carbon and nitrogen characteristics.</p> Conclusions <p>This study clarifies the differentiated regulation of SOC fractions and stability by vegetation type and soil depth. It underpins the optimization of vegetation configuration and deep-soil carbon pool management in salt marsh restoration and blue carbon enhancement, guiding carbon sequestration potential assessment and enhancement strategies.</p>

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Vegetation types regulate soil organic carbon fractions and stability in a tidal salt marsh

  • 期刊论文

  • 发表日期：

    2026年3月19日

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  • Zhongjie Liu,
  • Yawen Bai,
  • Weimin Song,
  • Xiaojie Wang,
  • Xiaojing Chu,
  • Xiaoshuai Zhang,
  • Yuping Hou,
  • Mingliang Zhao,
  • Guangxuan Han

摘要

Background

Salt marsh soil organic carbon (SOC) is a key component of “blue carbon” and crucial to the global carbon cycle. The influence of different vegetation types on SOC fractions and stability along soil profiles remains unclear, limiting the assessment of carbon sequestration potential.

Methods

Study sites were established in three typical vegetation zones (Tamarix chinensis, Phragmites australis, Suaeda salsa) and a bare tidal flat in the Yellow River Estuary salt marsh. By quantifying SOC fractions—particulate (POC) and mineral-associated organic carbon (MAOC)—and integrating these data with plant traits and soil properties, we investigated the distribution patterns of SOC fractions in topsoil (0–30 cm) and subsoil (30–100 cm) and the mechanisms regulating SOC stability (MAOC/POC ratio).

Results

SOC fractions and stability differed significantly among vegetation types and soil depths. P. australis had the highest SOC and MAOC contents, whereas T. chinensis had the highest POC stock. Although the bare tidal flat had the lowest SOC content, it exhibited the highest topsoil MAOC/POC ratio. Overall, the POC and MAOC contents, as well as the MAOC/POC ratio, were higher in topsoil than in subsoil. Topsoil MAOC/POC ratio was negatively regulated with plant traits, whereas subsoil MAOC/POC ratio was positively regulated to soil carbon and nitrogen characteristics.

Conclusions

This study clarifies the differentiated regulation of SOC fractions and stability by vegetation type and soil depth. It underpins the optimization of vegetation configuration and deep-soil carbon pool management in salt marsh restoration and blue carbon enhancement, guiding carbon sequestration potential assessment and enhancement strategies.