Contribution of riverine dissolved organic carbon to organic carbon decomposition in the Ariake Sea, Japan, a coastal area suffering from summer hypoxia

Hiroyuki Takasu; Tomohiro Okamura; Tomohiro KomoritaTomohiro ShiragakiKoji Uchino

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Contribution of riverine dissolved organic carbon to organic carbon decomposition in the Ariake Sea, Japan, a coastal area suffering from summer hypoxia

机译：Contribution of riverine dissolved organic carbon to organic carbon decomposition in the Ariake Sea, Japan, a coastal area suffering from summer hypoxia

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Dissolved organic carbon (DOC) comprises nearly half of the riverine organic carbon flux into oceans. Although riverine DOC is involved in numerous important ecosystem functions, excessive labile DOC inputs from rivers may contribute to hypoxia in coastal systems. Furthermore, many aspects of the contribution of riverine DOC to hypoxia are unknown. The natural carbon stable isotope ratio (δ~(13)C) in organic matter can be used to identify sources of organic carbon in coastal oceans. In this study, we analyzed the concentrations and δ~(13)C values of DOC in the bottom layer of the northern Ariake Sea, Japan, in which hypoxic water develops during summer. Additionally, we compared the δ~(13)C values of DOC at the beginning and end of an incubation experiment to determine the contribution of riverine DOC decomposition to hypoxia. The results of this study indicate that the bottom DOC concentration is influenced by both phytoplankton and river water, with the former likely having a stronger impact in the northwestern Ariake Sea in summer. Nevertheless, we also found major contributions (～49.7%) of DOC decomposition to total organic carbon decomposition at some stations. The initial δ~(13)C value of DOC ranged from -24.0 to -22.2‰, and the DOC δ~(13)C increased (from + 0.3 to + 0.8‰) in three of the five incubation bottles after incubation. This might be caused by selective decomposition of ~(13)C-depleted organic matter. The decomposed DOC in those bottles must be mainly derived from terrestrial sources. This result implies that riverine DOC decomposition contributes to hypoxia formation in the bottom layer of the northern Ariake Sea.

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《Aquatic sciences》 |2023年第1期|17.1-17.10|共10页
作者
Hiroyuki Takasu; Tomohiro Okamura; Tomohiro KomoritaTomohiro ShiragakiKoji Uchino;
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作者单位

Faculty of Environmental Science, Nagasaki University, 1-14 Bunkyo-Machi, Nagasaki 852-8521, Japan, Graduate School of Fisheries and Environmental Sciences, Nagasaki University, 1-14 Bunkyo-Machi, Nagasaki 852-8521, Japan, Division of Marine Energy Utiliz;

Graduate School of Fisheries and Environmental Sciences, Nagasaki University, 1-14 Bunkyo-Machi, Nagasaki 852-8521, Japan, Japan Fisheries Research and Education Agency, National Research Institute of Fisheries and Environment of Inland Sea, 2-17-5, Marui;

Faculty of Environmental and Symbiotic Science, Prefectural University of Kumamoto, 3-1-100 Tsukide, Kumamoto 862-8502, JapanGraduate School of Fisheries and Environmental Sciences, Nagasaki University, 1-14 Bunkyo-Machi, Nagasaki 852-8521, JapanGraduate School of Fisheries and Environmental Sciences, Nagasaki University, 1-14 Bunkyo-Machi, Nagasaki 852-8521, Japan, Kyushu Environmental Evaluation Association, 1-10-1 Matsukadai, Higashi-Ku, Fukuoka 813-0004, Japan;

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收录信息美国《科学引文索引》(SCI);
原文格式 PDF
正文语种英语
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关键词
Dissolved organic carbon; Riverine organic matter; Hypoxia; Carbon stable isotope ratio;

Contribution of riverine dissolved organic carbon to organic carbon decomposition in the Ariake Sea, Japan, a coastal area suffering from summer hypoxia

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