南海北部钦州湾大风江口海域溶解碳水化合物的分布特征及影响因素

doi:10.11978/2025146

热带海洋学报 ›› 2026, Vol. 45 ›› Issue (4): 179-189.doi: 10.11978/2025146CSTR: 32234.14.2025146

所属专题：南海专题

南海北部钦州湾大风江口海域溶解碳水化合物的分布特征及影响因素

曾德斌¹(), 亢振军¹, 杨斌¹^,²^,³(), 周姣娣¹^,³, 鲁栋梁¹, 黄海方¹^,⁴, 颜婷婷¹

¹ 北部湾大学, 广西海洋环境灾害过程与生态保护技术重点实验室, 广西钦州 535011
² 自然资源部滨海盐沼湿地生态与资源重点实验室/江苏省海洋生物技术重点实验室(江苏海洋大学), 江苏连云港 222005
³ 广西大学, 广西南海珊瑚礁研究重点实验室, 广西南宁 530004
⁴ 中国海洋大学, 海洋化学理论与工程技术教育部重点实验室, 山东青岛 266100

收稿日期:2025-08-24 修回日期:2025-09-16 出版日期:2026-07-10 发布日期:2026-07-31
通讯作者: 杨斌。email: binyang@jou.edu.cn
作者简介:
曾德斌(2001—), 男, 广西壮族自治区南宁市人, 研究方向为海洋生物地球化学。email: 2368161350@qq.com
基金资助:
国家自然科学基金项目(42166002); 广西自然科学基金(2025GXNSFAA069339); 江苏省自然科学基金项目(BK20241962); 广西北部湾海洋环境变化与灾害研究重点实验室(北部湾大学)开放课题(2024KF01); 北部湾大学海洋科学一流学科(TRB002); 北部湾海洋生态环境广西野外科学观测研究站(科研能力建设)(Guike 23-026-271)

Distribution characteristics of dissolved carbohydrates and their influencing factors in the Dafengjiang River Estuary (Qinzhou Bay, northern South China Sea)

ZENG Debin¹(), KANG Zhenjun¹, YANG Bin¹^,²^,³(), ZHOU Jiaodi¹^,³, LU Dongliang¹, HUANG Haifang¹^,⁴, YAN Tingting¹

¹ Guangxi Key Laboratory of Marine Environmental Disaster Processes and Ecological Protection Technology, Beibu Gulf University, Qinzhou 535011, China
² Key Laboratory of Coastal Salt Marsh Ecosystems and Resources, Ministry of Natural Resources/Jiangsu Key Laboratory of Marine Biotechnology, Jiangsu Ocean University, Lianyungang 222005, China
³ Guangxi Laboratory on the Study of Coral Reels in the South China Sea, Guangxi University, Nanning 530004, China
⁴ Key Laboratory of Marine Chemistry Theory and Technology, Ocean University of China, Qingdao 266100, China

Received:2025-08-24 Revised:2025-09-16 Online:2026-07-10 Published:2026-07-31
Contact: YANG Bin. email: binyang@jou.edu.cn
Supported by:
National Natural Science Foundation of China(42166002); Guangxi Natural Science Foundation(2025GXNSFAA069339); Natural Science Foundation of Jiangsu Province(BK20241962); Guangxi Key Laboratory of Marine Environmental Change and Disaster in Beibu Gulf, Beibu Gulf University(2024KF01); Marine Science First-Class Subject, Beibu Gulf University(TRB002); Beibu Gulf Marine Ecological Environment Field Observation and Research Station of Guangxi(Guike 23-026-271)

摘要/Abstract

摘要：

采用TPTZ (2, 4, 6-三吡啶-s-三嗪, tripyridyltriazine, C₁₈H₁₂N₆)方法对2022年7月大风江口海域溶解态单糖(monosaccharides, MCHO)、多糖(polysaccharides, PCHO)和总糖(total carbohydrates, TCHO)浓度进行分析, 并探究其分布特征及影响因素。结果表明, 大风江口海域表层海水中MCHO、PCHO和TCHO平均浓度分别为(24.78±12.72)、(14.75±3.66)和(39.53±12.87)μmol C·L⁻¹, 变化范围分别为8.52~43.71、9.96~21.01、19.54~61.72μmol C·L⁻¹。TCHO平均占溶解有机碳(dissolved organic carbon, DOC)比例为(52.8±17.3)%, 表明TCHO是该海域水体中DOC的重要组成部分。MCHO平均占TCHO比例为(59.1±15.5)%, 表明MCHO是TCHO的主要存在形式。大风江口海域表层水体中MCHO和TCHO浓度分布沿河流—河口—海湾连续体均呈现逐渐递减的趋势, PCHO则表现出相反的分布趋势。MCHO和TCHO浓度均与盐度呈显著的负相关(P<0.01), 表明陆源输入和物理稀释作用是控制大风江口海域溶解碳水化合物浓度分布的重要影响因素。PCHO与叶绿素a (Chl-a)浓度高值区相一致, 表明PCHO浓度分布可能主要受浮游植物原位生产等生物过程的调控。本研究将为世纪工程平陆运河建设之前钦州湾河流—河口—海湾连续体中水体溶解碳水化合物提供基础数据, 对深入认识广西北部湾近海碳循环过程及其机制具有重要意义。

关键词: 溶解碳水化合物, 溶解有机碳, 分布特征, 影响因素, 大风江口

Abstract:

The concentrations of dissolved monosaccharides (MCHO), polysaccharides (PCHO), and total carbohydrates (TCHO) were determined using the 2, 4, 6-tripyridyl-s-triazine (TPTZ) method in the Dafengjiang River Estuary (DRE) during July 2022, and their distribution characteristics and influencing factors were examined. The results showed that the average concentrations of MCHO, PCHO, and TCHO in the surface seawater of the DRE were (24.78±12.72), (14.75±3.66), and (39.53±12.87) μmol C·L^-1, respectively, with corresponding ranges of 8.52−43.71, 9.96−21.01, and 19.54−61.72 μmol C·L^-1. TCHO accounted for an average of (52.8 ± 17.3)% of the dissolved organic carbon (DOC) concentration, indicating that TCHO was a significant component of DOC in the study area. MCHO contributed an average of (59.1 ± 15.5)% to TCHO, suggesting that MCHO was the dominant form of TCHO. The concentrations of MCHO and TCHO exhibited a gradual decreasing trend along the river-estuary-bay continuum, while PCHO showed the opposite distribution pattern. Both MCHO and TCHO concentrations were significantly negatively correlated with salinity (P<0.01), indicating that terrestrial inputs and physical dilution processes were key factors controlling the distribution of dissolved carbohydrates in the DRE. The high-value areas of PCHO coincided with those of chlorophyll-a (Chl-a) concentrations, indicating that the distribution of PCHO concentrations might be mainly regulated by in situ production and other biological processes of phytoplankton. This study provides baseline data on dissolved carbohydrates in the river-estuary-bay continuum of the Qinzhou Bay prior to the construction of the Pinglu Canal, a mega project. These findings are of great significance for deepening our understanding of coastal carbon cycling processes and their mechanisms in the Beibu Gulf of Guangxi.

Key words: dissolved carbohydrates, dissolved organic carbon, distribution characteristics, influencing factors, Dafengjiang River Estuary

中图分类号:

P734

曾德斌, 亢振军, 杨斌, 周姣娣, 鲁栋梁, 黄海方, 颜婷婷. 南海北部钦州湾大风江口海域溶解碳水化合物的分布特征及影响因素[J]. 热带海洋学报, 2026, 45(4): 179-189.

ZENG Debin, KANG Zhenjun, YANG Bin, ZHOU Jiaodi, LU Dongliang, HUANG Haifang, YAN Tingting. Distribution characteristics of dissolved carbohydrates and their influencing factors in the Dafengjiang River Estuary (Qinzhou Bay, northern South China Sea)[J]. Journal of Tropical Oceanography, 2026, 45(4): 179-189.

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研究区域	调查时间	C_MCHO/(μmol C·L⁻¹)	C_PCHO/(μmol C·L⁻¹)	C_TCHO/(μmol C·L⁻¹)	参考文献
伊兹密尔湾	2017	0.70~8.30	0.70~19.50	2.60~24.60	Alyuruk et al, 2018
东海	2012	3.30~13.00	1.30~24.80	10.20~35.80	He et al, 2015
南海北部	2015	0.22~13.66	1.51~21.02	2.63~26.24	龚词等, 2017
北冰洋	2002	0.40~8.60	0.50~13.60	1.3~18.90	Wang et al, 2006
墨西哥湾	2010	4.00~27.00	5.00~76.00	15.00~103.00	Lin et al, 2015
孟加拉湾	1995—1996	2.40~15.60	17~36.60	27.00~47.40	Bhosle et al, 1998
加尔维斯敦湾	1999	13.30~62.10	10.2~41.90	23.00~96.70	Hung et al, 2001
三一河	2000—2001	27.00~112.00	3.70~16.30	35.60~155.40	Hung et al, 2005
胶州湾	2007—2008	2.90~65.90	0.30~210.20	10.80~276.10	Yang et al, 2010
茅尾海	2021	6.00~38.40	5.28~38.40	12.96~72.80	曾德斌等, 2025
大风江口海域	2022	8.52~43.71	9.96~21.01	19.54~61.72	本研究

南海北部钦州湾大风江口海域溶解碳水化合物的分布特征及影响因素

Distribution characteristics of dissolved carbohydrates and their influencing factors in the Dafengjiang River Estuary (Qinzhou Bay, northern South China Sea)

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层次	项目	C_MCHO/(μmol C·L⁻¹)	C_PCHO/(μmol C·L⁻¹)	C_TCHO/(μmol C·L⁻¹)	C_MCHO/C_TCHO	C_PCHO/C_TCHO
表层	范围	8.52~43.71	9.96~21.01	19.54~61.72	32.2%~76.1%	23.9%~67.8%
表层	平均值	24.78±12.72	14.75±3.66	39.53±12.87	(59.1±15.5)%	(40.9±15.5)%

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