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.
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.
the Creative Commons Attribution 4.0 License.
Research article
| 
16 Mar 2026
Research article |
| 16 Mar 2026
| 16 Mar 2026
Extreme drought–accelerated dissolved carbon metabolism triggers pulsed CO2 outgassing in karst lakes
Maofei Ni
College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
Weijun Luo
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China
Junbing Pu
Karst Research Team, Chongqing Key Laboratory of Carbon cycle and Carbon regulation of Mountain Ecosystem, School of Geography and Tourism, Chongqing Normal University, Chongqing, 401331, China
Guangneng Zeng
CORRESPONDING AUTHOR
College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
Jinxiao Long
College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
Jia Chen
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China
Jing Zhang
Karst Research Team, Chongqing Key Laboratory of Carbon cycle and Carbon regulation of Mountain Ecosystem, School of Geography and Tourism, Chongqing Normal University, Chongqing, 401331, China
Xiaodan Wang
College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
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Yining Zang, Pauline C. Treble, Kei Yoshimura, Jayson Gabriel Pinza, Fengbo Zhang, Kübra Özdemir Çallı, Xiaojun Mei, Admin Husic, Alena Gessert, Andrej Stroj, Bartolomé Andreo, Bernard Ladouche, Christine Stumpp, Diana Mance, Eleni Zagana, Fen Huang, Giuseppe Sappa, Harald Kunstmann, Heike Brielmann, Hong Zhou, Huaying Wu, Jakob Garvelmann, James Berglund, Jean-Baptiste Charlier, Jens Lange, Juan Antonio Barberá Fornell, Junbing Pu, Konstantina Katsanou, Kun Ren, Laura Toran, Laurence Gill, Maria Filippini, Martin Kralik, Matías Mudarra Martínez, Min Zhao, Mingming Luo, Nico Goldscheider, Nikolaos Lambrakis, Pantaleone De Vita, Qiong Xiao, Shi Yu, Silvia Iacurto, Silvio Coda, Ted McCormack, Vincenzo Allocca, W. George Darling, Walter D’Alessandro, Xulei Guo, Yundi Hu, Zhijun Wang, Eva Kaminsky, Jiří Faimon, Marek Lang, Pavel Pracný, and Andreas Hartmann
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2025-812, https://doi.org/10.5194/essd-2025-812, 2026
Preprint under review for ESSD
Short summary
Short summary
We developed the first global database of water from karst springs and cave drips that records different forms of oxygen and hydrogen, which naturally trace how rainwater moves through rocks. By gathering and checking thousands of measurements from around the globe and linking them with flow and rainfall data, the database provides a comprehensive view of water movement, allows scientists to compare regions, understand groundwater processes, and support sustainable water management worldwide.
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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.
We captured an extreme drought and subsequent wet period, showing microbiomes track time-varying...
