Biogeosciences
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Articles | Volume 22, issue 22
Articles | Volume 22, issue 22
https://doi.org/10.5194/bg-22-6979-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-6979-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 22
Research article
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20 Nov 2025
Research article | Highlight paper |  | 20 Nov 2025

Novel oxalate-carbonate pathways identified in the tropical dry evergreen forest of Tamil Nadu, India

Camille Rieder, Eric P. Verrecchia, Saskia Bindschedler, Guillaume Cailleau, Aviram Rozin, Munisamy Anbarashan, Shubhendu Dasgupta, Thomas Junier, Nicolas Roeschli, Pascal Vittoz, and Mike C. Rowley

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This study provides the first comprehensive evidence of active oxalate–carbonate pathways (OCPs) in India’s tropical dry evergreen forests, identifying four novel tree–microbe systems that mediate calcium carbonate formation. The findings reveal a previously unrecognized mechanism contributing to coupled organic and inorganic carbon cycling in tropical forest ecosystems of southern India.
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The oxalate-carbonate pathway, where trees and microbes store inorganic carbon as minerals, was studied on four tree species of the threatened tropical dry evergreen forest Indian forest. We used high-throughput sequencing of a gene to detect oxalate-degrading microbes. For all tree species, produced oxalate led to carbonate formation in soils and on wood. This carbon may be leached into water, suggesting a hidden source of inorganic carbon with implications for climate and conservation.
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