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热带海洋学报

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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. 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. 江苏海洋大学, 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 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:2025-10-16 接受日期:2025-10-23
  • 通讯作者: 杨斌
  • 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)(桂科23-026-271)

Distribution characteristics of dissolved carbohydrates and its influence 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. 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:2025-10-16 Accepted:2025-10-23
  • 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 (23-026-271)

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摘要： 采用TPTZ (2,4,6-三吡啶-s-三嗪, C18H12N6 )方法对2022年7月大风江口海域溶解态单糖(polysaccharides, 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平均浓度及范围分别为24.78 (8.52~43.71)、14.75 (9.96~21.01)和39.53 (19.54~61.72) μmol 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均与盐度和pH呈显著的负相关(P<0.01)，表明陆源输入和咸淡水混合过程是控制大风江口海域溶解碳水化合物浓度分布重要的影响因素，海水酸化通过调控生物过程间接影响该海域溶解碳水化合物的空间分布。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，这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 by 2,4,6-tripyridyl-s-triazine (TPTZ) method in the Dafeng River Estuary (DRE) during December 2022, and their distribution characteristics and influence factors were studied. The results showed that average (range) concentrations of MCHO, PCHO and TCHO in surface seawater of the DRE were 24.78 (8.52~43.71), 14.75 (9.96~21.01) and 39.53 (19.54~61.72) μmol C·L -1, respectively. 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 were significantly negatively correlated with salinity and pH (P<0.01), indicating that terrestrial inputs and freshwater-seawater mixing processes were key factors controlling the distribution of dissolved carbohydrates in the DRE, and seawater acidification indirectly regulated the spatial distribution of dissolved carbohydrates in the study area by modulating biological processes. This study will provide baseline data on dissolved carbohydrates in the river-estuary-bay continuum of the Qinzhou Bay prior to the construction of the Pinglu Canal, a century-long project. These findings are of great significance for deepening our understanding of coastal carbon cycling processes and their mechanisms in the Guangxi Beibu Gulf.

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