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首页> 外文期刊>Journal of oceanography >Nutrient regeneration at bottom after a massive spring bloom in a subarctic coastal environment, Funka Bay, Japan
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Nutrient regeneration at bottom after a massive spring bloom in a subarctic coastal environment, Funka Bay, Japan

机译：在日本Funka湾亚热带沿海环境中大量春季开花后，底部的养分再生

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Nutrient regeneration and oxygen consumption after a spring bloom in Funka Bay were studied on monthly survey cruises from February to November 1998 and from March to December 1999. A high concentration of ammonium (more than 4 μmol l?1) was observed near the bottom (80–90 m) after April. Phosphate and silicate gradually accumulated and dissolved oxygen decreased in the same layer. Salinity near the bottom did not change until summer, leading to the presumption that the system in this layer is semi-closed, so regenerated nutrients were preserved until September. Nitrification due to the oxidation of ammonium to nitrate was observed after June. Nitrite, an intermediate product, was detected at 4–7 μmol L?1 in June and July 1999. Assuming that decomposition is a first order reaction, the rate constant for decomposition of organic nitrogen was determined to be 0.014 and 0.008 d?1 in 1998 and 1999, respectively. The ammonium oxidation rate increased rapidly when the ambient ammonium concentration exceeded 5 μmol L?1. We also performed a budget calculation for the regeneration process. The total amount of N regenerated in the whole water column was 287.4 mmol N m?2 in 4 months, which is equal to 22.8 gC m?2, assuming the Redfield C to N ratio. This is 34% of the primary production during the spring bloom and is comparable to the export production of 25 gC m?2 measured by a sediment trap at 60 m (Miyake et al., 1998).
机译：在1998年2月至1998年11月和1999年3月至1999年12月的每月巡游中研究了Funka湾春季开花后的养分再生和氧气消耗。在底部附近观察到高浓度的铵盐（大于4μmoll？1）（四月后80-90 m）。磷酸盐和硅酸盐逐渐积累，并且溶解氧在同一层中减少。直到夏天，底部附近的盐度才发生变化，因此推测该层的系统是半封闭的，因此再生养分一直保存到9月。 6月后观察到由于铵氧化为硝酸盐而引起的硝化作用。亚硝酸盐，一种中间产物，在1999年6月和7月的4-7μmolL？1被检测到。假设分解是一级反应，则有机氮分解的速率常数被确定为0.014和0.008 d？1。 1998年和1999年。当环境铵浓度超过5μmolL？1时，铵的氧化速率迅速增加。我们还为再生过程执行了预算计算。假设雷德菲尔德碳氮比，整个水塔在4个月内再生的N总量为287.4 mmol N m？2，等于22.8 gC m？2。这是春季开花期间初级生产的34％，与出口沉积物在60 m处测得的25 gC m？2相当（Miyake等，1998）。

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