Shifts in riverine POC sources reduce terrestrial OC burial in the Changjiang subaqueous delta

Jin, Jiyuan; Wang, Ya Ping; Sheng, Hui; Tang, Bixuan; Feng, Wei; Liu, Lanyue; Liu, Rui

doi:10.5194/bg-23-5055-2026

Articles | Volume 23, issue 14

https://doi.org/10.5194/bg-23-5055-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/bg-23-5055-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 23, issue 14

Research article

|

22 Jul 2026

Research article |

| 22 Jul 2026

Shifts in riverine POC sources reduce terrestrial OC burial in the Changjiang subaqueous delta

Jiyuan Jin, Ya Ping Wang, Hui Sheng, Bixuan Tang, Wei Feng, Lanyue Liu, and Rui Liu

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https://doi.org/10.5194/bg-23-5055-2026-supplement

Data sets

Shifts in riverine POC sources reduce terrestrial OC burial in the Changjiang subaqueous delta Jiyuan Jin https://doi.org/10.5281/zenodo.20260902

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Short summary

Dam construction has altered riverine organic carbon (OC) composition, but its impact on deltaic OC burial remains unclear. Analysis of a four-decadal dataset of suspended and surface sediments in the Changjiang subaqueous delta reveals a temporal increase in freshwater algal OC and a decrease in petrogenic OC input to the East China Sea. This shift toward more labile OC reduced OC preservation efficiency from 15.1% to 10.7%, resulting in an approximately 50% loss of net OC preservation.