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<p>Underwater ecosystems, particularly those rich in seagrass, are characterized by their robust carbon sequestration capabilities and serve as a natural solution for mitigating climate change. Submarine groundwater discharge (SGD) acts as a conduit for transporting substances, such as dissolved organic carbon (DOC), from land to coastal areas. The SGD-derived DOC is pivotal in the carbon cycle of seagrass beds, although its influence on this cycle is not yet fully understood. In this research, a radon (<sup>222</sup>Rn) mass balance model was utilized to measure the SGD and SGD-derived DOC fluxes in a typical karst seagrass bed located at Morinje Lagoon in Croatia. The SGD was estimated to be (17.6 ± 4.4) cm/d, and the SGD-derived DOC was (155 ± 39) mmol/(m<sup>2</sup>·d). Furthermore, the carbon burial rate in the seagrass bed sediment was calculated to be 18.1 mmol/(m<sup>2</sup>·d). The ratio of SGD-derived DOC to carbon burial was 8.6, surpassing that of other coastal blue carbon ecosystems (0–1.1). Through excitation emission matrix fluorescence (EEM) and parallel factor (EEM-PARAFAC) analysis, it was determined that fluorophore dissolved organic matter (FDOM) components, predominantly humic-like (FDOMH) and protein-like (FDOMP), contribute 80% and 20%, respectively. In addition to vertical burial fluxes as a means of carbon sequestration, the SGD-derived DOC, especially FDOMH, has the potential for long-term storage in the ocean, underscoring the seagrass bed’s role as a dependable carbon sink.</p>

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Revealing the superiority of dissolved organic carbon fluxes from submarine groundwater discharge in karst seagrass beds, Morinje Lagoon, Croatia

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • Yuda Chen,
  • Xiaogang Chen,
  • Shiqing Sun,
  • Neven Cukrov,
  • Jian’an Liu,
  • Jinzhou Du,
  • Fenfen Zhang

摘要

Underwater ecosystems, particularly those rich in seagrass, are characterized by their robust carbon sequestration capabilities and serve as a natural solution for mitigating climate change. Submarine groundwater discharge (SGD) acts as a conduit for transporting substances, such as dissolved organic carbon (DOC), from land to coastal areas. The SGD-derived DOC is pivotal in the carbon cycle of seagrass beds, although its influence on this cycle is not yet fully understood. In this research, a radon (222Rn) mass balance model was utilized to measure the SGD and SGD-derived DOC fluxes in a typical karst seagrass bed located at Morinje Lagoon in Croatia. The SGD was estimated to be (17.6 ± 4.4) cm/d, and the SGD-derived DOC was (155 ± 39) mmol/(m2·d). Furthermore, the carbon burial rate in the seagrass bed sediment was calculated to be 18.1 mmol/(m2·d). The ratio of SGD-derived DOC to carbon burial was 8.6, surpassing that of other coastal blue carbon ecosystems (0–1.1). Through excitation emission matrix fluorescence (EEM) and parallel factor (EEM-PARAFAC) analysis, it was determined that fluorophore dissolved organic matter (FDOM) components, predominantly humic-like (FDOMH) and protein-like (FDOMP), contribute 80% and 20%, respectively. In addition to vertical burial fluxes as a means of carbon sequestration, the SGD-derived DOC, especially FDOMH, has the potential for long-term storage in the ocean, underscoring the seagrass bed’s role as a dependable carbon sink.