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Purpose <p>Phytoliths and phytolith-occluded organic carbon (PhytOC) are vital for carbon sequestration in wetlands, particularly those with silicon-rich vegetation, yet the processes governing their formation and retention within these plants remain largely unexplored.</p> Methods <p>We conducted a survey of <i>Phragmites australis</i>, a silicon-rich species, in the riverine wetlands of the Yellow River Delta in China. We measured the contents of phytolith and PhytOC in the aboveground and belowground parts, and analyzed their relations with topsoil properties and soil phytolith content at different depths.</p> Results <p>Although the aboveground biomass production was significantly larger than the belowground, there was no significant difference in the phytolith and PhytOC productivities between the above- and belowground parts due to the lower phytolith contents in the aboveground parts. The total productivities of phytolith and PhytOC in plants were not explained by plant biomass or soil properties (water content, pH, EC, TOC or TN). The phytolith content within the top 30&#xa0;cm of soil is correlated with biomass, indicating that phytoliths are contributed by local plants to the soil or that soil phytoliths may enhance plant growth. The synergistic accumulation of soil TOC and soil phytolith content across different soil layers underscores the role of plants in contributing phytoliths to the soil.</p> Conclusions <p>The findings suggest that vegetation quality may serve as a novel indicator of soil phytolith storage and soil functions including carbon sequestration, with implications for wetland management and climate change mitigation strategies.</p>

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Production of phytoliths and phytoc in above- and belowground parts of common reed (Phragmites australis) in a riverine wetland of the Yellow River Delta, China

  • 期刊论文

  • 发表日期：

    2025年8月10日

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  • Li Zhang,
  • Wenyi Sheng,
  • Huijia Song,
  • Lele Liu,
  • Weihua Guo,
  • Yuzhi Wang,
  • Changzi Ge

摘要

Purpose

Phytoliths and phytolith-occluded organic carbon (PhytOC) are vital for carbon sequestration in wetlands, particularly those with silicon-rich vegetation, yet the processes governing their formation and retention within these plants remain largely unexplored.

Methods

We conducted a survey of Phragmites australis, a silicon-rich species, in the riverine wetlands of the Yellow River Delta in China. We measured the contents of phytolith and PhytOC in the aboveground and belowground parts, and analyzed their relations with topsoil properties and soil phytolith content at different depths.

Results

Although the aboveground biomass production was significantly larger than the belowground, there was no significant difference in the phytolith and PhytOC productivities between the above- and belowground parts due to the lower phytolith contents in the aboveground parts. The total productivities of phytolith and PhytOC in plants were not explained by plant biomass or soil properties (water content, pH, EC, TOC or TN). The phytolith content within the top 30 cm of soil is correlated with biomass, indicating that phytoliths are contributed by local plants to the soil or that soil phytoliths may enhance plant growth. The synergistic accumulation of soil TOC and soil phytolith content across different soil layers underscores the role of plants in contributing phytoliths to the soil.

Conclusions

The findings suggest that vegetation quality may serve as a novel indicator of soil phytolith storage and soil functions including carbon sequestration, with implications for wetland management and climate change mitigation strategies.