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<p>As an essential component of terrestrial carbon sinks, lake sediments store vast quantities of both organic carbon (OC) and inorganic carbon (IC). However, the spatiotemporal relationship between the OC and IC in sediments and their responses to climate change remains unclear, which hinders the comprehensive understanding of carbon dynamics in lake ecosystems. This study systematically analyzes the spatiotemporal dynamics of carbon burial across the Tibetan Plateau using surface sediments from 119 lakes and sediment cores from four representative lakes. Results show that OC burial dominates in humid and dry sub-humid zones, whereas IC burial prevails in arid and semi-arid regions. This distribution reflects the influences of lake and catchment productivity and water chemistry on OC and IC patterns. Sediment cores confirm that these factors have consistently affected lake carbon burial over the past century. Specifically, in humid and dry sub-humid zones, increased precipitation enhances watershed productivity and sedimentation, promoting coupled OC and IC burial. In arid and semi-arid regions, wind-driven dust supplies nutrients and alters water chemistry, also driving coupled OC and IC burial. Based on these findings, the carbon sink capacity of lake sediments on the Tibetan Plateau is projected to increase under the “warming and wetting” trend.</p>

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Contrasting roles of precipitation and dust in regulating organic–inorganic carbon burial in Tibetan lakes across aridity gradients

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Mengting Zhao,
  • Yongquan Lin,
  • Lingmei Xu,
  • Zhitong Chen,
  • Wengang Kang,
  • Xinwei Yan,
  • Jianbao Liu

摘要

As an essential component of terrestrial carbon sinks, lake sediments store vast quantities of both organic carbon (OC) and inorganic carbon (IC). However, the spatiotemporal relationship between the OC and IC in sediments and their responses to climate change remains unclear, which hinders the comprehensive understanding of carbon dynamics in lake ecosystems. This study systematically analyzes the spatiotemporal dynamics of carbon burial across the Tibetan Plateau using surface sediments from 119 lakes and sediment cores from four representative lakes. Results show that OC burial dominates in humid and dry sub-humid zones, whereas IC burial prevails in arid and semi-arid regions. This distribution reflects the influences of lake and catchment productivity and water chemistry on OC and IC patterns. Sediment cores confirm that these factors have consistently affected lake carbon burial over the past century. Specifically, in humid and dry sub-humid zones, increased precipitation enhances watershed productivity and sedimentation, promoting coupled OC and IC burial. In arid and semi-arid regions, wind-driven dust supplies nutrients and alters water chemistry, also driving coupled OC and IC burial. Based on these findings, the carbon sink capacity of lake sediments on the Tibetan Plateau is projected to increase under the “warming and wetting” trend.