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<p>The Tibetan Plateau (TBP) hosts the highest and most numerous plateau lakes on Earth, which have significant scientific importance. However, the organic carbon accumulation rates (OCARs)—the amount of organic carbon deposited in lake sediments over a specific period—remain largely unknown in these lakes. In this study, we developed the first spatially explicit dataset of OCARs for 1525 lakes across the TBP based on <i>in-situ</i> measurements and catchment-scale characteristics, allowing us to estimate the organic carbon burial for this region. Our findings revealed substantial spatial variability in OCARs, closely correlated to catchment-scale terrestrial primary productivity and soil carbon-to-nitrogen ratios, underscoring the importance of surrounding environment in supplying carbon to lakes. By upscaling lake OCARs based on these drivers, we estimated the total OCAR of lakes across the TBP at 0.59 (0.35–0.67) Tg C yr<sup>−1</sup> over the past 150 yr. More than two-thirds of the sampled lakes exhibited increasing OCAR trends. Extrapolating our understanding of OCARs and their drivers under warmer and wetter future conditions, we projected a 17.0%–49.0% increase in lake OCARs by the end of the 21st century. This study provides the first quantitative assessment of OCAR across TBP lakes based on catchment-scale characteristics and highlights the increasing importance of lake carbon burial on the TBP as a long-term carbon sink.</p>

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Increased organic carbon burial in Tibetan Plateau lakes

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • Junzhi Liu,
  • Zhengxu Guo,
  • Pengcheng Fang,
  • Juzhi Hou,
  • Liping Zhu,
  • Jiajie Tang,
  • Bixi Guo,
  • Yuying Chen,
  • Yongqin Liu

摘要

The Tibetan Plateau (TBP) hosts the highest and most numerous plateau lakes on Earth, which have significant scientific importance. However, the organic carbon accumulation rates (OCARs)—the amount of organic carbon deposited in lake sediments over a specific period—remain largely unknown in these lakes. In this study, we developed the first spatially explicit dataset of OCARs for 1525 lakes across the TBP based on in-situ measurements and catchment-scale characteristics, allowing us to estimate the organic carbon burial for this region. Our findings revealed substantial spatial variability in OCARs, closely correlated to catchment-scale terrestrial primary productivity and soil carbon-to-nitrogen ratios, underscoring the importance of surrounding environment in supplying carbon to lakes. By upscaling lake OCARs based on these drivers, we estimated the total OCAR of lakes across the TBP at 0.59 (0.35–0.67) Tg C yr−1 over the past 150 yr. More than two-thirds of the sampled lakes exhibited increasing OCAR trends. Extrapolating our understanding of OCARs and their drivers under warmer and wetter future conditions, we projected a 17.0%–49.0% increase in lake OCARs by the end of the 21st century. This study provides the first quantitative assessment of OCAR across TBP lakes based on catchment-scale characteristics and highlights the increasing importance of lake carbon burial on the TBP as a long-term carbon sink.