西沙群岛永乐环礁礁外坡沉积物中有机碳的含量与来源分析

doi:10.11978/2023112

Abstract

Abstract:

Organic carbon burial is an important part of carbon cycle, but there are few studies on organic carbon in coral reef sediments, which affects the accurate assessment of coral reef carbon cycle. In this paper, the modern surface sediments from the outer slope of the Yongle Atoll, Xisha Islands, South China Sea, were analyzed for their total organic carbon (TOC) content, total nitrogen (TN) content, organic carbon isotope (δ¹³C) value, as well as sediment grain size, chlorophyll content and other indicators. The ecological condition of the outer slope of the Yongle Atoll reef is relatively good, and has the potential to represent the organic carbon characteristics in sediments of healthy coral reef ecosystems. The results showed that: 1) the TOC content in the sediments from the outer slope of Yongle Atoll reef ranged from 0.71 to 1.66 mg·g^-1, with an average of (1.23±0.31) mg·g^-1; the TN content ranged from 0.12 to 0.28 mg·g^-1, with an average of (0.20±0.05) mg·g^-1. 2) the C/N ratio ranged from 6.16 to 7.59, with an average of (6.75±0.34); δ¹³C values ranged from -17.49‰ to -15.85‰, with an average of (-16.61±0.49)‰, indicating that the organic carbon in the sediments was predominant of marine autochthonous origin and mainly from benthic plants. 3) Organic carbon content was negatively correlated with water depth and positively correlated with chlorophyll a content and pheophytin content, indicating that primary productivity controlled by benthic plants was the main source of organic carbon content on the outer slope of the reef. Combined with the vertical accumulation rate of the outer reef slope sediments of the Pacific Ocean since the Holocene (2~5mm·a^-1), it is inferred that the organic carbon burial flux of the outer slope of the Yongle Atoll is between 3~8g·m^-2·a^-1. The present study provides new information for evaluating the contribution of coral reefs in the South China Sea to the carbon cycle.

Key words: coral reef, sediment, organic carbon, carbon isotope, Yongle Atoll, Xisha Islands

GAO Jie, YU Kefu, XU Shendong, HUANG Xueyong, CHEN Biao, WANG Yonggang. Content and source analysis of organic carbon in the outer slope sediments of the Yongle Atoll, Xisha Islands[J].Journal of Tropical Oceanography, 2024, 43(3): 131-145.

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	TOC/(mg·g^-1)	TN/(mg·g^-1)	C/N	δ¹³C/‰	Chl a/(μg·g^-1)	Pheo/(μg·g^-1)	平均粒径/φ	粉砂含量/%	n
银屿	1.43±0.13	0.22±0.03	6.98±0.54	-16.44±0.33	4.71±1.57	2.40±0.89	0.60±0.24	0.28±0.11	3
石屿	1.21±0.31	0.20±0.05	6.62±0.31	-16.80±0.55	3.64±2.32	2.08±0.78	0.78±0.31	0.73±0.46	7
全富岛	1.15±0.48	0.18±0.07	6.87±0.17	-16.25±0.37	2.29±1.30	2.17±1.59	0.65±0.27	0.61±0.60	3
甘泉岛	0.99	0.16	6.75	-16.92	2.18	2.00	1.00	0.26	1
总计	1.23±0.31	0.20±0.05	6.75±0.34	-16.61±0.49	3.48±1.99	2.16±0.90	0.73±0.28	0.57±0.42	14

	TOC	TN	C/N	δ¹³C	Chl a	Pheo	平均粒径	粉砂含量	水深
TOC	1
TN	0.98***	1
C/N	0.06	-0.16	1
δ¹³C	0.08	-0.04	0.54*	1
Chl a	0.75**	0.74**	0.10	0.03	1
Pheo	0.78**	0.73**	0.21	0.42	0.73**	1
平均粒径	-0.59*	-0.54*	-0.21	-0.07	-0.38	-0.23	1
粉砂含量	-0.10	-0.07	-0.16	-0.11	-0.43	-0.30	-0.05	1
水深	-0.56*	-0.54*	-0.08	-0.44	-0.49	-0.55*	0.58*	0.21	1

有机质来源		C/N	δ¹³C	参考文献
陆地植物	C₃植物	22.7±11.6	-29.0±1.8	Yu et al, 2010
陆地植物	C₄植物	24.6±9.4	-13.1±0.5	Yu et al, 2010
浮游植物	浮游植物	7.3±1.2	-20.7±1.1	郭卫东等, 2002; 蒋日进等, 2014; 尹洪洋, 2022
底栖植物	大型海藻	9.5±2.7	-16.2±2.8	郭卫东等, 2002; 蒋日进等, 2014; 尹洪洋, 2022; 徐步欣, 2022
	草皮藻	9.7±3.6	-17.4±1.6	Briand et al, 2015; Vaughan et al, 2021
	海草	11.9±1.1	-8.1±0.1	Chen et al, 2022b; 徐步欣, 2022
	底栖微藻	7.6±0.7	-14.8±1.9	蒋日进, 2015; 尹洪洋, 2022
	虫黄藻	9.5±1.0	-13.3±1.4	Wyatt et al, 2013; Blanckaert et al, 2020; 许慎栋等, 2021

Content and source analysis of organic carbon in the outer slope sediments of the Yongle Atoll, Xisha Islands

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