海洋学研究 ›› 2025, Vol. 43 ›› Issue (1): 79-89.DOI: 10.3969/j.issn.1001-909X.2025.01.008

• 研究论文 • 上一篇    下一篇

热带红树林河口海-气CO2通量季节变化及控制因素——以海南东寨港为例

王洋1,2(), 全鑫1,3, 庄雅1,2, 赵化德1, 苏剑钟1,4,*()   

  1. 1.海南大学 南海海洋资源利用国家重点实验室,海南 海口 570228
    2.海南大学 海洋生物与水产学院,海南 海口 570228
    3.海南大学 生态学院,海南 海口 570228
    4.海南大学 海洋科学与工程学院,海南 海口 570228
  • 收稿日期:2024-11-19 修回日期:2025-01-12 出版日期:2025-03-15 发布日期:2025-05-30
  • 通讯作者: *苏剑钟(1990—),男,副研究员,主要从事河口近海碳的生物地球化学循环研究,E-mail: jzsu@hainanu.edu.cn。
  • 作者简介:王洋(2000—),男,河南省南阳市人,主要从事海-气界面CO2通量研究,E-mail:mr_tata@hainanu.edu.cn
  • 基金资助:
    国家自然科学基金青年科学基金项目(42306050);海南省科技人才创新项目(KJRC2023B04);海南大学科研启动基金项目(KYQD(ZR)-22026);海南大学科研启动基金项目(XJ2400005860)

Seasonal variation and controlling factors of air-sea CO2 flux in tropical mangrove estuary: A case study of Dongzhai Harbor, Hainan

WANG Yang1,2(), QUAN Xin1,3, ZHUANG Ya1,2, ZHAO Huade1, SU Jianzhong1,4,*()   

  1. 1. State Key Laboratory of Marine Resources Utilization in South China Sea, Hainan University, Haikou 570228, China
    2. School of Marine Biology and Fisheries, Hainan University, Haikou 570228, China
    3. School of Ecology, Hainan University, Haikou 570228, China
    4. School of Marine Science and Engineering, Hainan University, Haikou 570228, China
  • Received:2024-11-19 Revised:2025-01-12 Online:2025-03-15 Published:2025-05-30

摘要:

近岸河口受到陆源输入的影响,通常表现为大气二氧化碳(CO2)的源,而红树林生态系统一般是大气CO2的汇。因此,准确衡量红树林河口的CO2排放量对构建区域和全球碳收支具有重要的现实意义。东寨港位于海南岛东北部,向外连通琼州海峡,有5条主要河流汇入,西部和南部分布着成片红树林。本研究分别于2022年12月(干季)、2023年12月(干季)、2022年5月(湿季)、2023年8月(湿季)对东寨港、周边的主要河流以及邻近海域开展了4次野外调查。结果显示,表层水体CO2分压(pCO2)呈现从河流向港内、港外递减的趋势;温度、物理混合与生物活动都会影响干湿季pCO2空间分布;湿季CO2通量(8.8±8.2 mmol·m-2·d-1)大于干季(3.4±3.6 mmol·m-2·d-1),全年平均值为6.1±6.3 mmol·m-2·d-1,在全球红树林河口中处于较低水平;东寨港水体的年CO2排放量将抵消红树林植物固碳量的10.4%~21.9%。

关键词: 红树林河口, CO2分压, 海-气CO2通量, 季节变化

Abstract:

Coastal estuaries are influenced by terrestrial inputs and usually act as sources of atmospheric carbon dioxide (CO2), whereas mangrove ecosystems generally serve as sinks of atmospheric CO2. Therefore, accurately measuring the CO2 emissions at mangrove estuaries is of great significance for constructing regional and global carbon budgets. Dongzhai Harbor locates in the northeastern of Hainan Island, and connects to the Qiongzhou Strait outward, surrounding by 5 major small rivers. Mangroves are mainly distributed in the west and south of Dongzhai Harbor. This study conducted four field surveys in Dongzhaigang, the surrounding major rivers and the adjacent sea areas in December 2022 (dry season), December 2023 (dry season), May 2022 (wet season) and August 2023 (wet season) respectively. The results show that the surface water partial pressure of CO2 (pCO2) presents a decreasing trend from rivers to inner and outer harbor. Temperature, river-sea mixing, and biological respiration jointly affect the spatial distributions of pCO2 in the dry and wet seasons. The CO2 flux in wet season (8.8±8.2 mmol·m-2·d-1) is greater than that in dry season (3.4±3.6 mmol·m-2·d-1), and the annual CO2 flux (6.1±6.3 mmol·m-2·d-1) is lower than that in other tropical mangrove estuaries around the world. This study estimates that the estuarine CO2 emission could offset about 10.4%~21.9% of the carbon sequestration by plants in Dongzhai Harbor.

Key words: mangrove estuary, the partial pressure of CO2, air-sea CO2 flux, seasonal variation

中图分类号: