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热带海洋学报

• • 上一篇    

三亚湾溶解有机碳长期变化趋势及影响因素分析

周伟华1, 2, 3，姚煜坤1, 2, 3, 4，罗勇1, 2, 3，李涛1, 2, 3，龙爱民1, 4，黄晖1, 2, 3   

  1. 1. 热带海洋生物资源与生态实验室, 广东省应用海洋生物学重点实验室, 中国科学院南海海洋研究所, 广东 广州 510301;

    2. 海南省热带海洋生物技术重点实验室, 三亚海洋生态环境工程研究院, 海南 三亚 572000;

    3. 海南三亚海洋生态系统国家野外科学观测研究站, 中国科学院海南热带海洋生物实验站, 海南 三亚 572000;

    4. 中国科学院大学, 北京 100049

  • 收稿日期:2025-06-09 修回日期:2025-08-13 接受日期:2025-08-18
  • 通讯作者: 周伟华
  • 基金资助:
    海南省自然科学基金资助(425QN506)

Long-term variation of dissolved organic carbon and its influencing factors in Sanya Bay

ZHOU Weihua1, 2, 3, YAO Yukun1, 2, 3, 4, LUO Yong1, 2, 3, LI Tao1, 2, 3, LONG Aimin1, 4, HUANG Hui1, 2, 3   

  1. 1. Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;

    2. Key Laboratory of Tropical Marine Biotechnology of Hainan Province, Sanya Institute of Ocean Eco-Environmental Engineering, Sanya 572000, China;

    3. Sanya National Marine Ecosystem Research Station, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572000, China;

    4. University of Chinese Academy of Sciences, Beijing 100049, China

  • Received:2025-06-09 Revised:2025-08-13 Accepted:2025-08-18
  • Supported by:
    Natural Science Foundation of Hainan Province (425QN506)

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摘要： 本研究基于逐步回归分析与随机森林算法，以三亚湾2008-2023年水体实测的理化参数为输入数据，探究了三亚湾溶解有机碳(dissolved organic carbon, DOC)的时空分布特征、演变趋势及其影响主因。结果表明，DOC浓度在2008-2018年期间显著上升，随后呈下降趋势；近岸海域出现DOC的高值区，但DOC浓度均值为(2.00±1.34)mg·L-1，相比于半封闭型海湾，整体维持在较低水平；逐步回归分析与随机森林算法结果显示：DOC与温度、总碱度以及活性硅酸盐均呈显著非线性关系，整体呈现先增后减趋势；DOC与总磷、溶解氧和活性磷酸盐均呈显著负相关关系。这些结果表明，温度、总碱度、总磷、活性硅酸盐、溶解氧和活性磷酸盐是影响三亚湾DOC的主要因子。本研究明确了三亚湾DOC近十六年的变化趋势及其影响主因，结果有助于更加全面地认识三亚湾水体有机碳的长期演变趋势及其影响因素，为热带海湾生态系统碳循环研究提供基础资料。

关键词: 溶解有机碳, 时空分布, 环境因子, 三亚湾

Abstract: To explore the spatio-temporal changes and trends and environmental impact factors of dissolved organic carbon (DOC) in Sanya Bay, the water physicochemical parameters collected from 2008 to 2023 in Sanya Bay were used as the input data of the stepwise regression analysis (SR) and random forest algorithm (RF). The results showed that the DOC concentration increased significantly from 2008 to 2018 and then showed a downward trend. The high-value zones of DOC were found on the coastal areas of Sanya Bay. The mean value of DOC concentration was (2.00±1.34) mg·L-1, which was maintained at a lower level compared to other semi-enclosed bays. The results of SR and RF showed that: DOC had nonlinear relationships with temperature, total alkalinity and silicate; DOC had significant negative correlations with total phosphorus, dissolved oxygen and phosphate. These results demonstrated that temperature, total alkalinity, total phosphorus, silicate, dissolved oxygen and phosphate were the main factors affecting DOC in Sanya Bay. This study clarified the changing trends of DOC and its main influencing factors in Sanya Bay over the past sixteen years, laying a foundation for further research in the carbon cycle in tropical bays.

Key words: Dissolved organic carbon, spatio-temporal distribution, environmental factors, Sanya Bay