中国海洋大学学报（自然科学版）2024，Vol.54Issue(5)：71-82,12.DOI:10.16441/j.cnki.hdxb.20230044
珠江口及海南岛东南海域海水中氨基酸的分布及其对有机物降解指示的研究
Distribution of Amino Acids and Their Indications of Dissolved Organic Matter Degradation in Seawater of the Pearl River Estuary and Hainan Island Southeast Sea
摘要
Abstract
The concentrations and distributions of total dissolved amino acids(THAA),dissolved or-ganic carbon(DOC),organic nitrogen(TN)and chlorophyll a(Chl a)in the seawater of the Pearl Riv-er Estuary and Hainan Island Southeast Sea were systematically investigated in August 2021.The re-sults showed that the concentrations of THAA in the study area ranged from 0.68 to 4.22 μmol/L,with an average of(1.69±0.98)μmol/L.In the vertical distribution,the amino acid concentrations all showed a gradual decrease with increasing depth.Concentrations of THAA positively correlated with aspartic acid(Asp)/β-alanine(β-Ala)and glutamic acid(Glu)/γ-aminobutyric acid(γ-Aba)ratios,in-dicating that bacterial activity had an important influence on the distribution and degradation of THAA.The contribution of bacterial organic carbon to DOC was about(13.04%±4.50%),showing a lower value inshore than offshore and a higher value in surface layer than in bottom layer.It was found that the distribution trend of contribution of carbon in amino acid to organic carbon(THAA-C%)was lower inshore than offshore,indicating a greater degradation of organic matter at the inshore station.Degrada-tion Index(DI)and Reactivity Index(RI)showed similar distribution trends with THAA-C%,and high value areas were observed in the eastern part of the study area and the inshore waters of the Pearl River Estuary.In the vertical profile,lower values of degradation factor were found at the bottom layer of the Pearl River Estuary in transect S8—S14,indicating that the degradation degree of organic matters in the bottom layer was greater,whereas contrast distribution patterns were found near the Southeast Sea of Hainan Island.关键词
氨基酸/溶解有机质/降解因子/珠江口/海南岛Key words
amino acids/dissolved organic matter/degradation factor/pearl river estuary/Hainan Island分类
海洋科学引用本文复制引用
朱晓乐,陈岩,杨桂朋..珠江口及海南岛东南海域海水中氨基酸的分布及其对有机物降解指示的研究[J].中国海洋大学学报（自然科学版）,2024,54(5):71-82,12.基金项目
国家自然科学基金项目(41976038,41830534) （41976038,41830534）
山东省自然科学基金项目(ZR2020MD075) （ZR2020MD075）
国家重点研究发展计划项目(2016YFA-0601300)资助 Supported by the National Natural Science Foundation of China(41830534,41506088) （2016YFA-0601300）
the Shandong Provincial Natural Science Foundation(ZR2020MD075) （ZR2020MD075）
the National Key Research and Development Program(2016YFA0601304) （2016YFA0601304）
