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Purpose <p>Plant diversity significantly influences the structure and function of ecosystems and plays a crucial role in soil organic carbon (SOC) sequestration. Research on the relationship between plant diversity and soil organic carbon density (SOCD) can help elucidate the mechanisms of carbon source and sink dynamics in inland salt marshes.</p> Materials and methods <p>In the inland salt marsh wetland of Sugan Lake, three plots (I, II, and III) were established perpendicular to the lake shore based on the historical water level fluctuations. Using community surveys and redundancy analysis, in this study, the patterns of plant community species diversity and SOCD across different habitats were investigated, as were the relationships between them.</p> Results and discussion <p>The results indicated that as the duration of surface water accumulation decreases, the vegetation in the inland salt marsh wetland tends to shift from annual true halophytes (I) to perennial salt-excreting plants (II) and perennial grasses (III). The Shannon‒Wiener index and Pielou index tend to increase, whereas the Simpson index decreases. SOCD also tends to increase. SOCD is significantly positively correlated with the Shannon‒Wiener index and Pielou index and significantly negatively correlated with the Simpson index (<i>P</i> &lt; 0.01). The main factors influencing plant diversity and SOCD are soil water content, soil pH, and underground biomass.</p> Conclusions <p>Habitat filtering and environmental stressors alter plant functional groups and community species diversity. With the reduction in surface water accumulation duration, the SOC and SOCD increase in inland salt marsh wetlands, reflecting the mechanisms through which plant community composition and species diversity promote SOCD.</p>

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Relationship between plant diversity and soil organic carbon density in inland salt marsh wetlands of Sugan Lake

  • 期刊论文

  • 发表日期：

    2026年2月6日

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  • Wenhao Shi,
  • Xiawei Zhao,
  • Chengzhang Zhao,
  • Xinyue Zhang,
  • Enqi Wang

摘要

Purpose

Plant diversity significantly influences the structure and function of ecosystems and plays a crucial role in soil organic carbon (SOC) sequestration. Research on the relationship between plant diversity and soil organic carbon density (SOCD) can help elucidate the mechanisms of carbon source and sink dynamics in inland salt marshes.

Materials and methods

In the inland salt marsh wetland of Sugan Lake, three plots (I, II, and III) were established perpendicular to the lake shore based on the historical water level fluctuations. Using community surveys and redundancy analysis, in this study, the patterns of plant community species diversity and SOCD across different habitats were investigated, as were the relationships between them.

Results and discussion

The results indicated that as the duration of surface water accumulation decreases, the vegetation in the inland salt marsh wetland tends to shift from annual true halophytes (I) to perennial salt-excreting plants (II) and perennial grasses (III). The Shannon‒Wiener index and Pielou index tend to increase, whereas the Simpson index decreases. SOCD also tends to increase. SOCD is significantly positively correlated with the Shannon‒Wiener index and Pielou index and significantly negatively correlated with the Simpson index (P < 0.01). The main factors influencing plant diversity and SOCD are soil water content, soil pH, and underground biomass.

Conclusions

Habitat filtering and environmental stressors alter plant functional groups and community species diversity. With the reduction in surface water accumulation duration, the SOC and SOCD increase in inland salt marsh wetlands, reflecting the mechanisms through which plant community composition and species diversity promote SOCD.