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<p>Wetlands serve as vital carbon sinks; however, compared with the surface carbon pool, the relative stock and stability of organic carbon (OC) buried in deep sediment layers remain uncertain, particularly in alpine regions. Based on 42 sediment across seven wetlands on the Qinghai-Xizang Plateau, this study disentangled the OC accumulation process and its drivers since the Holocene. Our results highlighted that deep sediments ( &gt;1 m) stored ~70% of the total OC in alpine wetlands, much of which was labile. Historical warming facilitated the accumulation of such labile OC. Moreover, an intercalated sedimentary structure, formed by silt and fine-grained clay both below and above the OC-rich layer, prevented them from rapid decomposition. Given that elevated groundwater temperatures and intensified hydrological processes in alpine regions may stimulate the decomposition of these massive labile OC pools, releasing carbon into surface water or the atmosphere, future climate change assessments should take this long-overlooked carbon pool into account.</p><p></p>

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Climate and sedimentary structure drive deep labile carbon accumulation in alpine wetlands

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月16日

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  • Youqing Yang,
  • Xiaoping Wang,
  • Jianqing Du,
  • Hui Zhang,
  • Zhixiang Niu,
  • Yitao Zhang,
  • Zeyuan Wang,
  • Liyuan Ma,
  • Haijun Zhang,
  • Danhong Chen,
  • Chenhao Gao,
  • Qiang Liu,
  • Yu Wu,
  • Yanbin Hao,
  • Haishan Niu,
  • Kai Xue,
  • Xiaoyong Cui,
  • Yanfen Wang

摘要

Wetlands serve as vital carbon sinks; however, compared with the surface carbon pool, the relative stock and stability of organic carbon (OC) buried in deep sediment layers remain uncertain, particularly in alpine regions. Based on 42 sediment across seven wetlands on the Qinghai-Xizang Plateau, this study disentangled the OC accumulation process and its drivers since the Holocene. Our results highlighted that deep sediments ( >1 m) stored ~70% of the total OC in alpine wetlands, much of which was labile. Historical warming facilitated the accumulation of such labile OC. Moreover, an intercalated sedimentary structure, formed by silt and fine-grained clay both below and above the OC-rich layer, prevented them from rapid decomposition. Given that elevated groundwater temperatures and intensified hydrological processes in alpine regions may stimulate the decomposition of these massive labile OC pools, releasing carbon into surface water or the atmosphere, future climate change assessments should take this long-overlooked carbon pool into account.