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Aims <p>Wetland drying caused by hydrological changes has a significant impact on soil organic carbon (SOC) stocks. Plant- and microbial-derived carbon (C) are major contributors to SOC accumulation and stability; however, their respective contributions to SOC (P-contribution and M-contribution) remain unclear under a wetland drying scenario.</p> Methods <p>In this study, we used lignin phenols and amino sugars as biomarkers to compare the P-contribution and M-contribution in the wet and dry seasons of 2021 and 2022 in a typical sub-lake wetland of Poyang Lake, and to identify the key drivers.</p> Results <p>The results showed that wetland drying reduced both P-contribution and M-contribution. Specifically, the reduction of S-type lignin phenols in SOC was more pronounced than that of other plant-derived components during wetland drying. For microbial-derived components, the contribution of bacterial-derived C to SOC decreased more than that of fungal-derived C. P-contribution was consistently regulated by soil and microbial properties in both the wet and dry seasons, with bulk density and soil moisture being the key factors, respectively. M-contribution was primarily influenced by soil properties (soil moisture) in the wet season, but was jointly influenced by soil (nitrate nitrogen), plant (NDVI), and microbial properties (microbial biomass C) in the dry season.</p> Conclusion <p>Our study shows that wetland drying may weaken plant- and microbial-mediated C processes, providing insights into the long-term vulnerability of wetland carbon pools to climate-driven hydrological changes.</p>

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Hydrological change-induced wetland drying decreases the contributions of plant- and microbial-derived carbon to soil organic carbon in Poyang Lake

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Yuheng Zeng,
  • Shan Zhang,
  • Jinting Zhang,
  • Shujing Jiang,
  • Yantian Ma,
  • Lan Wu

摘要

Aims

Wetland drying caused by hydrological changes has a significant impact on soil organic carbon (SOC) stocks. Plant- and microbial-derived carbon (C) are major contributors to SOC accumulation and stability; however, their respective contributions to SOC (P-contribution and M-contribution) remain unclear under a wetland drying scenario.

Methods

In this study, we used lignin phenols and amino sugars as biomarkers to compare the P-contribution and M-contribution in the wet and dry seasons of 2021 and 2022 in a typical sub-lake wetland of Poyang Lake, and to identify the key drivers.

Results

The results showed that wetland drying reduced both P-contribution and M-contribution. Specifically, the reduction of S-type lignin phenols in SOC was more pronounced than that of other plant-derived components during wetland drying. For microbial-derived components, the contribution of bacterial-derived C to SOC decreased more than that of fungal-derived C. P-contribution was consistently regulated by soil and microbial properties in both the wet and dry seasons, with bulk density and soil moisture being the key factors, respectively. M-contribution was primarily influenced by soil properties (soil moisture) in the wet season, but was jointly influenced by soil (nitrate nitrogen), plant (NDVI), and microbial properties (microbial biomass C) in the dry season.

Conclusion

Our study shows that wetland drying may weaken plant- and microbial-mediated C processes, providing insights into the long-term vulnerability of wetland carbon pools to climate-driven hydrological changes.