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

Abstract

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

CLC Number:

P734

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.

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References 40

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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

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

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