南海北部钦州湾茅尾海溶解碳水化合物的分布特征及影响因素

doi:10.11978/2024171

热带海洋学报 ›› 2025, Vol. 44 ›› Issue (3): 197-205.doi: 10.11978/2024171CSTR: 32234.14.2024171

南海北部钦州湾茅尾海溶解碳水化合物的分布特征及影响因素

曾德斌¹(), 彭光煜², 杨斌¹^,³(), 莫小荣¹, 周姣娣¹^,⁴, 黄海方¹, 颜婷婷¹

1.北部湾大学, 广西北部湾海洋环境变化与灾害研究重点实验室, 广西钦州 535011
2.江苏师范大学地理测绘与城乡规划学院, 江苏徐州 221116
3.江苏海洋大学, 江苏省海洋生物技术重点实验室, 江苏连云港 222005
4.广西大学, 广西南海珊瑚礁研究重点实验室, 广西南宁 530004

收稿日期:2024-09-09 修回日期:2024-10-11 出版日期:2025-05-10 发布日期:2025-06-04
通讯作者: 杨斌
作者简介:
曾德斌(2001—), 男, 广西南宁人, 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); 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); 连云港市科技计划项目(JCYJ2313)

Distribution characteristics of dissolved carbohydrates and their influencing factors in the Maowei Sea, Qinzhou Bay, northern South China Sea

ZENG Debin¹(), PENG Guangyu², YANG Bin¹^,³(), MO Xiaorong¹, ZHOU Jiaodi¹^,⁴, HUANG Haifang¹, YAN Tingting¹

1. Guangxi Key Laboratory of Marine Environmental Change and Disaster in Beibu Gulf, Beibu Gulf University, Qinzhou 535011, China
2. School of Geography, Geomatics and Planning, Jiangsu Normal University, Xuzhou 221116, China
3. Jiangsu Key Laboratory of Marine Biotechnology, Jiangsu Ocean University, Lianyungang 222005, China
4. Guangxi Laboratory on the Study of Coral Reels in the South China Sea, Guangxi University, Nanning 530004, China

Received:2024-09-09 Revised:2024-10-11 Online:2025-05-10 Published:2025-06-04
Contact: YANG Bin
Supported by:
National Natural Science Foundation of China(42166002); Natural Science Foundation of Jiangsu Province(BK20241962); Guangxi Key Laboratory of Marine Environmental Change and Disaster in Beibu Gulf, Beibu Gulf University(2024KF01); Scientific Research Capacity Building Project for Beibu Gulf Marine Ecological Environment Field Observation and Research Station of Guangxi(23-026-271); Lianyungang Science and Technology Plan Program(JCYJ2313)

摘要/Abstract

摘要： 采用TPTZ (2, 4, 6-三吡啶-s-三嗪, C₁₈H₁₂N₆ )方法对2021年12月茅尾海表、底层海水中溶解态单糖(monosaccharides, MCHO)、多糖(polysaccharides, PCHO)和总糖(total carbohydrates, TCHO)浓度进行测定, 并对其分布特征及影响因素进行了研究。结果表明, 茅尾海MCHO、PCHO和TCHO平均浓度及范围分别为15.15 (2.40~38.40)、13.19 (3.92~38.40)和28.34 (11.52~76.80)μmol C·L^-1。TCHO占溶解有机碳(dissolved organic carbon, DOC)浓度平均比例为(40.2±10.8)%, 表明TCHO是DOC的重要组成部分。MCHO占TCHO的浓度平均比例为(52.9±12.2)%, 表明MCHO是TCHO的主要存在形式。茅尾海表、底层MCHO、PCHO和TCHO浓度水平分布均呈现由河口向外海逐渐递减的趋势。表层MCHO、PCHO和TCHO与盐度呈显著负相关(P<0.01), 与Chl a呈显著正相关(P<0.05); 底层MCHO和TCHO与盐度呈显著负相关(P<0.01), TCHO与Chl a呈显著正相关(P<0.05), 表明陆源输入和浮游植物自生产是控制冬季茅尾海溶解碳水化合物分布重要的影响因素。本研究将有助于丰富广西北部湾溶解碳水化合物生物地球化学特征的认识, 对全球碳循环过程及其机制的深入理解具有重要意义。

关键词: 溶解有机碳, 溶解碳水化合物, 分布特征, 影响因素, 茅尾海

Abstract:

Using the 2, 4, 6-tripyridyl-s-triazine (TPTZ) method, the concentrations of dissolved monosaccharides (MCHO), polysaccharides (PCHO), and total carbohydrates (TCHO) were determined for the surface and bottom seawater of the Maowei Sea in December 2021, and their distribution characteristics and influencing factors were studied. The results showed that mean (range) concentrations of MCHO, PCHO and TCHO were 15.15 (2.40’38.40), 13.19 (3.92’38.40) and 28.34 (11.52’76.80) μmol C·L^-1, respectively. The average proportion of TCHO in dissolved organic carbon (DOC) was (40.2±10.8)%, suggesting that TCHO was an important component of DOC. The average proportion of MCHO in TCHO was (52.9±12.2)%, indicating that MCHO was the main fraction of TCHO. The horizontal distributions of MCHO, PCHO, and TCHO in the surface and bottom seawater both displayed a decreasing trend from the estuary to offshore waters. In the surface seawater, the concentrations of MCHO, PCHO, and TCHO were much negatively correlated with salinity (P<0.01) but much positively correlated with chlorophyll a (Chl a). In the bottom seawater, the concentrations of MCHO and TCHO were much negatively correlated with salinity (P<0.01) and TCHO was much positively correlated with Chl a. These results suggested that terrestrial inputs and biogeochemical processes were important factors affecting the distribution of dissolved carbohydrates in the Maowei Sea during winter. The study will help to enrich the understanding of biogeochemical characteristics of dissolved carbohydrates in the Guangxi part of Beibu Gulf, which is of great significance to the in-depth understanding of global carbon cycle processes and their mechanisms.

Key words: dissolved organic carbon, dissolved carbohydrates, distribution characteristics, influencing factors, Maowei Sea

中图分类号:

P734

曾德斌, 彭光煜, 杨斌, 莫小荣, 周姣娣, 黄海方, 颜婷婷. 南海北部钦州湾茅尾海溶解碳水化合物的分布特征及影响因素[J]. 热带海洋学报, 2025, 44(3): 197-205.

ZENG Debin, PENG Guangyu, YANG Bin, MO Xiaorong, ZHOU Jiaodi, HUANG Haifang, YAN Tingting. Distribution characteristics of dissolved carbohydrates and their influencing factors in the Maowei Sea, Qinzhou Bay, northern South China Sea[J]. Journal of Tropical Oceanography, 2025, 44(3): 197-205.

图/表 9

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项目	表层浓度/(μmol C·L^-1)		底层浓度/(μmol C·L^-1)
项目	范围	平均值	范围	平均值
MCHO	6.00~38.40	16.30±8.22	2.40~22.00	12.84±6.29
PCHO	5.28~38.40	14.52±7.95	3.92~19.84	10.54±4.90
TCHO	12.96~76.80	30.82±15.71	11.52~39.84	23.38±8.68
MCHO/TCHO	38.3%~69.4%	(52.9±8.7)%	20.8%~84.9%	(53.1±17.9)%
PCHO/TCHO	30.6%~61.7%	(47.1±8.7)%	34.0%~79.2%	(46.9±17.9)%

区域	调查时间	MCHO浓度/(μmol C·L^-1)	PCHO浓度/(μmol C·L^-1)	TCHO浓度/(μmol C·L^-1)	参考文献
雅浦海沟	2016	4.60~22.10	3.50~27.30	13.80~36.30	Guo et al, 2020
东海	2017	1.94~6.23	1.46~9.85	4.73~15.21	胡春等, 2019
东海	2012	3.30~13.00	1.30~24.80	10.20~35.80	He et al, 2015
南海	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
加尔维斯顿湾	1999	13.30~62.10	10.2~41.90	23.00~96.70	Hung et al, 2001
特里尼蒂河	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
珠江口	2007	7.70~70.00	3.60~63.00	15.00~133.00	He et al, 2010
茅尾海	2021	6.00~38.40	5.28~38.40	12.96~72.80	本研究

南海北部钦州湾茅尾海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 Maowei Sea, Qinzhou Bay, northern South China Sea

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