海南文昌清澜湾红树林潮沟地下水溶解碳通量的潮汐动态

张越; 朱虹霓; 王一清; ALYAAZidan; 崔振昂; 吴自军

doi:10.16028/j.1009-2722.2023.148

海南文昌清澜湾红树林潮沟地下水溶解碳通量的潮汐动态

1.
同济大学海洋地质国家重点实验室，上海 200092

2.
中国地质调查局广州海洋地质调查局，广州 510760

基金项目: 国家自然科学基金“海底地下水排泄过程中溶解无机碳的迁移转化及其对海洋的贡献”（41976057），“东海近岸泥质区沉积物铁结合态磷的形成与埋藏: 甲烷厌氧氧化作用的影响”（42276059）

详细信息

作者简介: 张越（2000—），男，在读硕士，主要从事海洋生物地球化学方面的研究工作. E-mail：zy3311@tongji.edu.cn

通讯作者: 吴自军（1973—），男，教授，主要从事海洋环境与生物地球化学方面的研究工作. E-mail：wuzj@tongji.edu.cn

中图分类号: P731；P641

收稿日期: 2023-06-03

刊出日期: 2024-05-28

Tidal dynamics of dissolved carbon flux in ground water of a mangrove tidal creek in Qinglan Bay, Wenchang, Hainan

1.
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China

2.
Guangzhou Marine Geological Survey, Guangzhou 510075, China

More Information

Corresponding author: WU Zijun, wuzj@tongji.edu.cn

Received Date: 03 June 2023

Publish Date: 28 May 2024

摘要

摘要:
海底地下水排泄（SGD）是陆地溶解碳向海洋输送的一个重要途径。以清澜湾潮沟为研究对象，以盐度为保守参数计算淡水SGD的占比为2.5%～22.7%，平均为13.0%；SGD净流量为0.86×10⁵ m³/d。基于地下水溶解碳浓度，计算出该潮沟输出的溶解无机碳（DIC）和溶解有机碳（DOC）通量分别为5.78×10⁵和0.10×10⁵ mol/d。其中，DIC是潮沟溶解碳输送的主要形式，占总溶解碳的98.3%。低潮时，DOC的49%来源于红树林植物碎屑，51%来源于SGD；DIC的78%来源于SGD，22%来源于红树林沉积物有机质。高潮时，DOC的44%来源于被污染的海水，56%来源于红树林植物碎屑；DIC的65%来源于海水，35%来源于孔隙水交换。红树林潮沟SGD向清澜湾输送了大量的溶解碳，其对近海水体碳酸盐平衡体系的影响需要进一步研究。
- 红树林潮沟 /
- 淡水SGD /
- 溶解碳 /
- 稳定碳同位素 /
- 潮汐作用
Abstract:
Submarine groundwater discharge (SGD) is an important pathway for transporting dissolved carbon from land to the ocean. A tidal creek of the Qinglan Bay (Hainan, China) was selected for study in the regard. The field work was conducted in Oct.-Dec., 2019. Results show that the proportion of freshwater SGD in was 2.5%～22.7%, in average of 13.0%, and the net SGD flow rate was 0.86×10⁵ m³/d. Based on the dissolved carbon concentration in groundwater, we estimated that the fluxes of dissolved inorganic carbon (DIC) and dissolved organic carbon (DOC) output from the tidal creek were 5.78×10⁵ mol/d and 0.10×10⁵ mol/d, respectively. Among them, the DIC was the main form of dissolved carbon transported in the tidal creek, accounting for 98.3% of the total dissolved carbon. At low tide, 49% of DOC came from mangrove plant debris, and 51% comes from SGD. In DIC, 78% came from SGD and 22% from organic matter in mangrove sediment. At high tide, 44% of DOC was from contaminated seawater and 56% from mangrove plant debris. In DIC, 65% came from seawater and 35% from pore water exchange. The SGD of mangrove tidal channels transported a large amount of dissolved carbon to the Qinglan Bay, and its impact on the carbonate balance system of nearshore water needs to be clarified in the future.
- mangrove tidal creek /
- fresh SGD /
- dissolved inorganic carbon /
- stable carbon isotope /
- tidal action

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图 1 研究区域与采样点概况

Figure 1.

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图 2 高潮和低潮Cl⁻、SO₄²⁻、DIC、DOC和POC及其$ \mathrm{\mathrm{\mathit{\mathrm{\delta}}}} $¹³C值随盐度的变化

Figure 2.

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图 3 SGD_F/SGD与水深、盐度的时间变化

Figure 3.

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图 4 潮沟涨、落潮DIC、DOC通量和水流量

Figure 4.

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图 5 水深与²²²Rn值、DIC、DOC和POC浓度相关性分析（a—d）及 ²²²Rn值与盐度、DIC、DOC和POC浓度相关性分析（e—h）

Figure 5.

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图 6 潮沟水体SO₄²⁻与Cl⁻相关分析

Figure 6.

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图 7 水深、DIC、DOC和POC的时间变化

Figure 7.

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图 8 “添加”的碳源线性回归分析

Figure 8.

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图 9 低潮和高潮POC、DOC、DIC不同来源贡献比例

Figure 9.

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图 10 DIC（左）和DOC（右）质量平衡模型

Figure 10.

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表 1 高、低潮盐度、Cl⁻和SO₄²⁻浓度、DIC、DOC和POC浓度及其$ \mathrm{\delta } $¹³C值

Table 1. Salinity, concentrations of Cl⁻, SO₄²⁻, DIC, DOC, POC, and their δ¹³C values in high and low tides

	位置	盐度 /psu	Cl⁻ /（mmol/L）	SO₄²⁻ /（mmol/L）	DIC /（mmol/L）	δ¹³C_DIC /‰	DOC /（mmol/L）	δ¹³C_DOC /‰	POC /（mmol/L）	δ¹³C_POC /‰
高潮	H-01	31.64	502.08	28.59	1.10	−0.43	0.34	−29.23	2.30	−20.93
	H-02	32.47	524.65	29.39	1.26	−0.56	0.14	−25.97	0.87	−20.43
	H-03	32.53	517.25	28.75	1.25	−0.33	0.29	−29.50	0.71	−19.94
	H-04	32.16	511.25	27.64	1.55	−1.59	0.19	−27.50	——	——
	H-05	31.36	491.58	27.62	1.25	−0.67	0.20	−27.26	1.17	−22.27
	H-06	30.23	474.03	26.32	1.35	−1.35	0.22	−26.94	1.11	−23.67
	H-07	28.6	468.24	25.98	1.30	−2.13	0.25	−26.95	1.35	−26.40
	H-08	26.59	414.72	22.60	1.43	−3.64	0.35	−27.00	2.45	−27.76
	H-09	30.56	488.18	27.69	1.33	−1.25	0.26	−27.83	1.29	−24.62
	H-10	29.4	469.90	26.69	1.30	−2.06	0.25	−26.66	1.49	−25.93
	H-11	28.43	452.55	24.00	1.26	−2.49	0.24	−26.83	1.93	−25.98
	H-12	28.58	444.18	25.48	1.39	−2.61	0.23	−26.85	1.37	−26.76
	H-13	29.95	466.03	25.65	1.21	−1.77	0.26	−27.53	1.00	−26.13
	H-14	28.99	456.49	25.02	1.31	−2.27	0.22	−25.68	0.94	−26.66
	H-15	28.37	460.05	25.46	1.28	−2.86	0.24	−26.84	1.27	−26.56
	平均值	29.99	476.08	26.46	1.30	−1.73	0.25	−27.24	1.38	−24.57
低潮	L-01	27.36	431.10	24.07	1.19	−2.48	0.21	−26.40	——	——
	L-02	24.76	375.60	21.24	1.70	−6.03	0.49	−26.86	5.74	−29.63
	L-03	21.9	346.37	18.85	1.95	−6.70	0.59	−26.94	7.40	−29.79
	L-04	24.31	371.99	20.91	1.93	−6.65	0.48	−27.40	4.22	−28.98
	L-05	22.89	352.84	20.21	2.03	−6.82	0.52	−27.44	6.27	−28.97
	L-06	25.21	364.97	20.18	1.76	−7.06	0.47	−27.3	5.78	−28.29
	L-07	22.29	352.62	18.95	2.19	−7.52	——	——	8.77	−28.66
	平均值	24.10	370.78	20.63	1.82	−6.18	0.46	−27.06	6.36	−29.05
注：“——”表示无数据。

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