Hydrology and Earth System Sciences
Hydrology and Earth System Sciences
HESS
Articles | Volume 30, issue 5
Articles | Volume 30, issue 5
https://doi.org/10.5194/hess-30-1381-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-30-1381-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 30, issue 5
Research article
 | 
16 Mar 2026
Research article |  | 16 Mar 2026

Extreme drought–accelerated dissolved carbon metabolism triggers pulsed CO2 outgassing in karst lakes

Maofei Ni, Weijun Luo, Junbing Pu, Guangneng Zeng, Jinxiao Long, Jia Chen, Jing Zhang, Xiaodan Wang, and Zhikang Wang

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Short summary
We captured an extreme drought and subsequent wet period, showing microbiomes track time-varying dissolved carbon metabolism and modulate carbon dioxide flux. Particularly, the drought boosts heterotrophs, accelerating dissolved organic carbon respiration and carbon dioxide emission. The biological carbon pump induces priming: rapid labile dissolved organic carbon loss but recalcitrant dissolved organic carbon accumulation, causing pulsed carbon dioxide after photosynthetic peaks.
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