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首页> 外文期刊>Journal of oceanography >Underestimation of nutrient fluxes due to possible bacterial activity during a core incubation experiment
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Underestimation of nutrient fluxes due to possible bacterial activity during a core incubation experiment

机译：在核心孵育实验中可能由于细菌活动而导致营养通量低估

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Examinations of sediment core incubation and calculations of diffusive nutrient fluxes based on the difference between the nutrient concentration in pore water and that in the overlying water were carried out to evaluate the benthic fluxes of nutrients such as phosphate (PO4), ammonium (NH4), and silicic acid [Si(OH)4] from the sediment–water interface. Test surface-sediment samples were collected in the western area of the Seto Inland Sea in October 2013 and January 2014. They were incubated onboard the ship for intervals of approximately 40–90?h, and changes in the concentrations of nutrients in the overlying water with incubation time were monitored. Furthermore, in order to inhibit bacterial activity, sodium azide (NaN3) was added to the overlying water of another incubation system, whereupon nutrient concentrations in the overlying water were observed to increase linearly with incubation time. On the other hand, when NaN3 was not added, a linear increase was observed in the Si(OH)4 concentration but not in those of PO4 and NH4. The calculated diffusive fluxes generally agreed with those obtained from core incubation with the addition of NaN3. These findings suggest that the elution of PO4 and NH4 from the sediment–water interface during a core incubation experiment can be affected by bacterial activity, which could potentially lead to the underestimation of benthic fluxes. Therefore, great care should be taken when carrying out incubations of surface sediment, and they should be performed along with calculations of diffusive fluxes.
机译：根据孔隙水和上覆水中养分浓度之间的差异，对沉积物核心孵化进行了研究，并计算了扩散性养分通量，以评估诸如磷酸盐（PO4），铵（NH4），和沉积物-水界面中的硅酸[Si（OH）4]。 2013年10月和2014年1月在濑户内海西部地区收集了测试的表面沉积物样本。它们在船上孵育大约40-90？h，并在上覆水中养分浓度变化用潜伏时间进行监测。此外，为了抑制细菌活性，将叠氮化钠（NaN 3）添加到另一个温育系统的上层水中，随后观察到上层水中的营养物浓度随培养时间线性增加。另一方面，当不添加NaN3时，观察到Si（OH）4浓度呈线性增加，而PO4和NH4浓度则没有线性增加。计算得出的扩散通量通常与通过添加NaN3进行核心孵育获得的扩散通量一致。这些发现表明，在核心孵育实验中，沉积物-水界面中的PO4和NH4洗脱可能受到细菌活性的影响，这有可能导致对底栖生物通量的低估。因此，在进行表面沉积物培养时应格外小心，并应与扩散通量的计算一起进行。

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