Lability of sedimentary organic nitrogen estimated from amino acids in a reservoir on land reclaimed from Isahaya Bay, Kyushu, Japan

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Hiroyuki Takasu , Tomoya Era , Kotaro Miyahara , Maiko Ito
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Abstract

In 1997, the inner part of Isahaya Bay on the west coast of the Ariake Sea was separated from the sea by dikes, leading to the formation of a freshwater reservoir. Since the Isahaya Reclamation Project began in the 1990s, red tides have become more common in the bay. Studies suggested that a non-negligible amount of NH4+ was regenerated from organic matter decomposition in the turbid water drained from the reservoir into the bay, and this drainage water might be an important source of NH4+ for red tides in the bay. Although labile organic matter in the turbid water might also originate from resuspended sediments in the reservoir induced by the drainage process, the potential for the resuspended sedimentary organic matter to serve as an NH4+ source has never been evaluated. In this study, we found that sediments near the drainage gates on the dike in the reservoir contained high levels of amino acids and NH4+. In addition, the NH4+ concentrations were positively correlated with amino acids concentrations. This result can be explained by increasing NH4+ production according to labile organic nitrogen accumulation in the sediments near the dike. The result of our study suggests that the sediment resuspension near the dike induced by drainage might be a source of bioavailable nitrogen for Isahaya Bay.

从氨基酸估算日本九州谏早湾填海造地水库沉积有机氮的稳定性
1997 年,有明海西海岸的谏早湾内部被堤坝与大海隔开,形成了一个淡水水库。自 20 世纪 90 年代开始实施谏早填海项目以来,该海湾的赤潮变得更加常见。研究表明,从水库排入海湾的浊水中有机物分解产生了不可忽视的 NH4+,这些排水可能是海湾赤潮的重要 NH4+来源。虽然浊水中的易变有机物也可能来自排水过程引起的水库沉积物再悬浮,但沉积有机物再悬浮作为 NH4+ 来源的潜力从未被评估过。在这项研究中,我们发现水库堤坝排水闸附近的沉积物含有大量氨基酸和 NH4+。此外,NH4+ 浓度与氨基酸浓度呈正相关。这一结果可以解释为,堤坝附近沉积物中的可溶性有机氮积累导致 NH4+ 生成量增加。我们的研究结果表明,排水引起的堤坝附近沉积物再悬浮可能是谏早湾生物可用氮的一个来源。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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