Factors regulating the compositions and distributions of dissolved organic matter in the estuaries of Jiaozhou Bay in North China

文献类型： 外文期刊

第一作者： Hu, Jiaojie

作者： Hu, Jiaojie;Zou, Li;Yu, Ge;Hu, Jiaojie;Wang, Jian;Zou, Li;Ren, Qianqian;Yu, Ge;Xia, Bin

作者机构：

关键词： Estuaries in Jiaozhou; Bay; Dissolved organic matter; CDOM; Carbohydrates; Amino acids

期刊名称：OCEANOLOGIA （ 影响因子：2.427； 五年影响因子：2.671 ）

ISSN： 0078-3234

年卷期： 2020 年 62 卷 1 期

页码：

收录情况： SCI

摘要： Water samples collected from the Jiaozhou Bay every two months between April 2016 and February 2017 were analyzed for dissolved organic carbon (DOC), particulate organic carbon (POC), total dissolved carbohydrates (TCHO), total hydrolyzed amino acids (THAA), and chromophoric dissolved organic matter (CDOM) to explore the biogeochemical processes of dissolved organic matter (DOM) in anthropogenic estuarine and coastal environments. In addition, nutrients, chlorophyll a and COD (chemical oxygen demand) in these samples were also analyzed. All parameters exhibited temporal and spatial variations: POC 0.13-22.40 mg/L (average 1.75 mg/L), DOC 0.98-32.75 mg/L (average 5.04 mg/L), COD 0.23-7.58 mg/L (average 1.67 mg/L), TCHO 0.34-14.09 mu M (average 3.18 mu M), THAA 0.89-8.30 mu M (average 4.04 mu M), and the absorption coefficient a(355) of CDOM 0.23-16.35 m(-1) (average 3.09 m(-1)). The temporal and spatial variations in the concentrations of TCHO, THAA, and DOC implied that the DOM in the study areas had a relatively higher biochemical activity. The canonical correspondence analysis (CCA) and maximal information coefficient (MIC) revealed that seasonal variations in temperature and the phosphate concentration were the dominant factors regulating the DOM distributions in Jiaozhou Bay, while riverine inputs and in situ reproduction mainly controlled the DOM compositions. (C) 2019 Institute of Oceanology of the Polish Academy of Sciences.

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