Surface sediments were collected from a mariculture area adjacent to the Yangma Island suffering from hypoxia in summer, and a laboratory static incubation was conducted to study the sedimentary oxygen consumption (SOC) and the benthic fluxes of nutrients and fluorescent dissolved organic matter (FDOM). Compared with some coastal areas, the SOC of the studied area was relatively low in summer with the value of 2.34–6.03 mmol m⁻² d⁻¹. Sediment acted as an important source of nutrients (except for nitrate) and FDOM for the overlying water. Dissolved oxygen (DO) in the overlying water could affect the decomposition mode of sedimentary organic matter (SOM), i.e. aerobic and anaerobic decomposition and subsequently dominated the release of nutrients and FDOM. When DO > 50 μmol l⁻¹, it was beneficial to the release of ammonium, silicate and FDOM. In contrast, low oxygen conditions, i.e. DO < 100 μmol l⁻¹, stimulated sediment phosphate efflux. In addition, scallop farming activities also affected the SOC and benthic flux of nutrients and FDOM mainly through biological deposition.

表面沉积物是从邻近于从缺氧夏季养马岛苦难养殖面积收集，并进行实验室静态孵育来研究沉积耗氧量（SOC）和底栖通量的营养物和荧光溶解的有机物质（FDOM）。与某些沿海地区相比，研究区域的夏季SOC相对较低，值为2.34-6.03 mmol m ^-2  d ^-1。沉积物是上层水的重要养分（硝酸盐除外）和FDOM的重要来源。上覆水中溶解氧（DO）可能影响沉积物的分解方式有机物（SOM），即需氧和厌氧分解，随后主导了养分和FDOM的释放。当DO> 50μmoll ^-1时，有利于铵，硅酸盐和FDOM的释放。相反，低氧条件，即DO <100μmoll ^-1，刺激了沉积物磷酸盐外排。此外，扇贝养殖活动也影响了SOC和底栖通量的营养素和FDOM主要是通过生物沉积。