Chemical characterization of dissolved organic matter in Hiroshima Bay, Japan
Chemical characterization of dissolved organic matter in Hiroshima Bay, Japan
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DOI：
10.1006/ecss.2001.0777
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发表时间：
2001-07-01
影响因子：
2.8
通讯作者：
Imai, A
中科院分区：
文献类型：
--
作者：
Fukushima, T;Ishibashi, T;Imai, A
广岛湾溶解性有机碳（DOC）和亲水性有机碳（hill -DOC）浓度呈现明显的季节变化（夏季高，冬季低），表明hill -DOC是本地产生的。XAD-8树脂对海湾水体的疏水性DOC （Hob-DOC）分选率为33%，对河流水体的分选率为41%，而对100 d内分解的活性DOC分选率分别为20%和24%。计算出DOC对叶绿素a的增量为(0.014 mg (-1))/(mu gl(-1))。混合试验表明，入流河口DOC的沉积可以忽略不计。Hob-DOC在夏季和冬季穿过海湾时，其浓度变化可以忽略不计，但其化学特征，如分光光度性质和平均分子量与河流来源的化学特征不同。相反，hill - doc的不稳定组分和难降解组分在夏季主要在海湾内部产生，尽管有相当比例的不稳定组分在运输到海湾外部的过程中发生了生物降解，但其化学特性没有发生显著变化。(C) 2001学术出版社。
The concentrations of dissolved organic carbon (DOC) and hydrophilic DOC (Hil-DOC) in Hiroshima Bay showed clear seasonal changes (high in summer and low in winter), suggesting the autochthonous production of Hil-DOC. The percentages of hydrophobic DOC (Hob-DOC) fractionated by XAD-8 resin were 33% for the bay waters and 41% for the river waters, whereas those of labile DOC (which decomposed during an incubation period of 100 days) were 20% and 24%, respectively. The increment of DOC to Chlorophyll a was calculated to be (0.014 mgl(-1))/(mu gl(-1)). The mixing experiments suggested a negligible deposition of DOC at the estuaries of inflowing rivers. The Hob-DOC went through the bay with negligible changes in concentration in both summer and winter, but its chemical characteristics, e.g. spectrophotometric properties and mean molecular weight, differed from those of riverine origin. In contrast, both labile and refractory components of Hil-DOC were produced mainly in the inner part of the bay during summer, and although a significant percentage of the labile component was subjected to biodegradation during transport to the outer part of the bay, its chemical characteristics did not change dramatically. (C) 2001 Academic Press.