Microscopic variation of oxygen consumption rate in sediments from shellfish farming zones of Haizhou Bay, China

文献类型： 外文期刊

第一作者： Tan, Liushuyi

作者： Tan, Liushuyi;Yu, Jinzhen;Meng, Rongzhao;Ma, Haojie;Zhang, Jihong;Zhang, Jihong

作者机构：

关键词： Shellfish farming; Microelectrode; Oxygen consumption rate; Sediment-water interface; Organic carbon mineralization

期刊名称：MARINE ENVIRONMENTAL RESEARCH （ 影响因子：3.2； 五年影响因子：3.3 ）

ISSN： 0141-1136

年卷期： 2025 年 211 卷

页码：

收录情况： SCI

摘要： Shellfish mariculture significantly enhances particulate organic carbon (POC) deposition through biodeposition, but the accompanying processes of sediment oxygen consumption and organic carbon mineralization constrain its carbon sequestration potential. In this study, high-resolution microelectrode profiling was used to characterize oxygen dynamics at the sediment-water interface (SWI) in four different areas of Haizhou Bay: two shellfish farming zones (SF-1 and SF-2) and two no-farming control zones (SC and OF). Key findings included that oxygen penetration depth (OPD) in shellfish farming zones (2.87 +/- 2.07 mm) was significantly lower than control zones (6.91 +/- 1.56 mm; P < 0.01). The diffusive boundary layer (DBL) thickness ranged from 0.59 to 1.71 mm, averaging 1.05 +/- 0.3 mm, and showed strong dependence on surface sediment grain size. Sediment oxygen consumption rate (R) in farming zones was 2-5 times higher than OF zone, peaking in summer (2.115-7.305 x 10(-5) mu mol cm-(3) s-(1); P < 0.001). Oxygen diffusive flux (J) of Summer in farming zones reached 0.41 +/- 0.18 x 10-(5) mu mol cm-(2) s-(1) (P < 0.01 vs. OF), driven by thin DBL and steep oxygen gradients. TOC-dominated mineralization was observed in SF-1 (3-8-fold higher than OF) and SF-2 sediments, with surface sediment TOC content strongly correlating to mineralization rates ((r = 0.83, P < 0.001). Fine-grained sediments enhanced TOC enrichment, while thicker DBL hindered oxygen exchange at SWI, collectively intensifying oxygen demand in the top 1 mm sediment layer. The results showed that the sediment oxygen consumption rate and organic carbon mineralization rate were high in the shellfish farming zones, and multiple factors, including water temperature, sediment type, and terrigenous input influence the final carbon burial situation. Sustainable shellfish farming requires long-term field data and adaptive monitoring to optimize management practices.

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