The importance of porewater exchange process on carbon lateral export from saltmarsh creek to coastal sea

Jian’an LIU; Xueqing YU; Xinyi LIN; Tong PENG; Liming XUE; Jinzhou DU

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The importance of porewater exchange process on carbon lateral export from saltmarsh creek to coastal sea

Chemistry | Updated：2025-02-19

- The importance of porewater exchange process on carbon lateral export from saltmarsh creek to coastal sea
- Journal of Oceanology and Limnology Vol. 43, Issue 1, Pages: 90-102(2025)
- Affiliations：
  
  1.State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China
  2.State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China
- Author bio：
  
  jzdu@sklec.ecnu.edu.cn
- Funds：
- DOI：
  CLC：
- Received：05 December 2023，
  
  Published：01 January 2025
- Accepted：
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LIU Jian’an,YU Xueqing,LIN Xinyi,et al.The importance of porewater exchange process on carbon lateral export from saltmarsh creek to coastal sea[J].Journal of Oceanology and Limnology,2025,43(01):90-102.
DOI：

LIU Jian’an,YU Xueqing,LIN Xinyi,et al.The importance of porewater exchange process on carbon lateral export from saltmarsh creek to coastal sea[J].Journal of Oceanology and Limnology,2025,43(01):90-102. DOI：

摘要

Abstract

Saltmarsh is one of the blue carbon ecosystems for the highest carbon burial efficiency. However

the buried carbon in saltmarsh may still be exported to coastal water through porewater exchange

a process that has often been overlooked in previous studies. A typical tidal creek of the Dongtan saltmarsh wetland in Chongming Island

Shanghai

China

was studied. The

224

Ra and

223

Ra activities were measured and the hydrological parameters such as water flow were determined

from which the porewater exchange rate in the tidal creek was estimated to be 1.78±1.73 cm/d. Meanwhile

the carbon concentrations in porewater were determined

based on which the fluxes of dissolved inorganic carbon (DIC)

dissolved organic carbon (DOC)

and CO

exported from porewater exchange were derived to be 60±17

6.6±4.0

0.082±0.079

and 16±11 mmol/(m

·d)

respectively. In addition

analysis on different species of carbon in the creek water showed that

the fluxes of DIC

DOC

and CO

exported laterally from tidal creek to coastal sea were 58±14

7.6±2.3

0.001 1±0.000 63

and 1.5±0.68 mmol/(m

·d)

respectively

indicating that the porewater exchange-derived carbon fluxes accounted for a large portion of the lateral carbon outwelling

and even much higher than those in CH

and CO

fluxes. Furthermore

the carbon exported from porewater exchange accounted for 50% of the carbon burial in the tidal creek system

of which DIC accounted for 73% of the total carbon flux transported by porewater exchange. Therefore

this study indicated that the porewater exchange-derived carbon fluxes to the tidal creek water may cause an overestimation in the carbon sequestration capacity of saltmarsh wetlands

and revealed the importance of porewater exchange for the carbon cycle of tidal creek system of saltmarsh wetlands.

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references

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