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<p>The microbial fixation of carbon (MCF) in salt lakes is an essential component of lake carbon cycling, yet rates of inorganic carbon uptake, particularly under ice-covered conditions, remain poorly constrained. The present study quantified the microbial uptake rates of carbon in dark and light-driven conditions in Qinghai Lake (QHL), the largest saline lake on the Qinghai-Tibet Plateau, using a <sup>13</sup>C-bicarbonate labelling approach combined with geochemical and microbial analyses. Active MCF occurred throughout the water column during ice cover, with dark-dependent carbon fixation (DCF) dominating, contributing 61% and ranging from 2.82 to 9.21&#xa0;µg C/(L·h), while light-dependent carbon fixation (LCF) ranged from 1.14 to 4.37&#xa0;µg C/(L·h). DCF decreased with depth and was significantly influenced by temperature and nitrate, whereas LCF increased with depth and was affected by temperature, sulfate, and chlorophyll. Both DCF and LCF showed significant associations with specific microbial genera: DCF correlated with <i>Nannochloropsis, Bacteroides</i>, <i>Pyramimonas</i>, <i>Tetracystis</i>, and <i>Hemiselmis</i>, whereas LCF was linked to <i>Leptolyngbya</i>, <i>Amphora, Navicula</i> and <i>Surirella</i>. These findings fill a critical gap in understanding carbon fixation dynamics in Tibetan Plateau saline lakes during ice-covered periods and provide essential insight into carbon cycling processes in alpine lacustrine ecosystems with ongoing global climate change.</p> Graphical Abstract <p></p>

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Microbial inorganic carbon fixation characteristics in the largest saline lake of China during the ice-covered period

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月3日

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  • Yixuan Han,
  • Fangzhong Shi,
  • Xin Liu,
  • Zhigang Wang,
  • Rui Wang,
  • Xiaoyan Li

摘要

The microbial fixation of carbon (MCF) in salt lakes is an essential component of lake carbon cycling, yet rates of inorganic carbon uptake, particularly under ice-covered conditions, remain poorly constrained. The present study quantified the microbial uptake rates of carbon in dark and light-driven conditions in Qinghai Lake (QHL), the largest saline lake on the Qinghai-Tibet Plateau, using a 13C-bicarbonate labelling approach combined with geochemical and microbial analyses. Active MCF occurred throughout the water column during ice cover, with dark-dependent carbon fixation (DCF) dominating, contributing 61% and ranging from 2.82 to 9.21 µg C/(L·h), while light-dependent carbon fixation (LCF) ranged from 1.14 to 4.37 µg C/(L·h). DCF decreased with depth and was significantly influenced by temperature and nitrate, whereas LCF increased with depth and was affected by temperature, sulfate, and chlorophyll. Both DCF and LCF showed significant associations with specific microbial genera: DCF correlated with Nannochloropsis, Bacteroides, Pyramimonas, Tetracystis, and Hemiselmis, whereas LCF was linked to Leptolyngbya, Amphora, Navicula and Surirella. These findings fill a critical gap in understanding carbon fixation dynamics in Tibetan Plateau saline lakes during ice-covered periods and provide essential insight into carbon cycling processes in alpine lacustrine ecosystems with ongoing global climate change.

Graphical Abstract