热带海洋学报 ›› 2025, Vol. 44 ›› Issue (3): 206-216.doi: 10.11978/2024132CSTR: 32234.14.2024132

• 海洋环境科学 • 上一篇    下一篇

近30年来涠洲岛海域海水磷含量变化及其影响因素—来自高分辨率珊瑚记录的证据

陈裕月1(), 姜伟2(), 杨浩丹2, 余克服2   

  1. 1.中国地质大学(武汉)海洋学院, 湖北 武汉 430070
    2.广西大学海洋学院, 广西南海珊瑚礁研究重点实验室, 广西 南宁 530004
  • 收稿日期:2024-06-27 修回日期:2024-07-29 出版日期:2025-05-10 发布日期:2025-06-04
  • 通讯作者: 姜伟
  • 作者简介:

    陈裕月(2000—), 女, 硕士研究生, 海洋科学专业, 主要从事海洋地质方面研究。email:

  • 基金资助:
    国家重点研发计划项目(2023YFF0804801); 国家自然科学基金项目(41976059)

Changes and controlling factors of seawater phosphorus in Weizhou Island over the past 30 years: Insights from high-resolution coral records

CHEN Yuyue1(), JIANG Wei2(), YANG Haodan2, YU Kefu2   

  1. 1. College of Marine Science and Technology, China University of Geosciences, Wuhan 430070, China
    2. Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China
  • Received:2024-06-27 Revised:2024-07-29 Online:2025-05-10 Published:2025-06-04
  • Contact: JIANG Wei
  • Supported by:
    National Key Research and Development Program of China(2023YFF0804801); National Natural Science Foundation of China(41976059)

摘要:

表层海水磷(P)含量变化是评价海洋生态系统营养含量的重要参数, 对地球环境演变过程起到重要调节作用。涠洲岛是我国最大最年轻的火山岛, 海水表层P含量变化缺乏长时间尺度记录, 影响因子尚未明确。珊瑚骨骼P/Ca是反演海水P含量的可靠指标, 被广泛用于重建高分辨率海水P含量变化历史。本研究以涠洲岛西北部连续生长珊瑚为研究对象, 基于珊瑚氧同位素建立1985—2015年的年龄框架, 重建1985—2014年月分辨率的珊瑚P/Ca变化历史。不同年份的珊瑚P/Ca值及其季节变化较大, 在1998—2003年之间珊瑚P/Ca值较低, 普遍低于年平均值。珊瑚P/Ca比值变化与季风强度变化存在极大相关性(P<0.05), 季风、台风盛行期珊瑚P/Ca值明显增加, 说明海表风速是该区域海水P含量变化的主控因素。此外, 火山爆发、石油泄露以及旅游业的发展也会造成P含量短暂性升高, 但影响时长有限。降雨量年际变化及干湿季变化与P/Ca值相关性不显著, 说明陆源物质对海水P含量变化的影响有限。

关键词: 涠洲岛, 磷, 珊瑚礁, 地球化学

Abstract:

The change in phosphorus (P) content in surface seawater is an important parameter to evaluate the nutrient content of marine ecosystem, and plays a significant role in regulating the evolution of the Earth’s environment. Weizhou Island is the largest and youngest volcanic island in China. The change in surface phosphorus content in seawater over a long time scale is not well documented, and the influencing factors remain unclear. Coral skeleton P/Ca is a reliable index for retrieving seawater phosphorus content and is widely used to reconstruct the high-resolution history of seawater P content. In this study, continuously growing corals from northwest Weizhou Island were taken as the research object, and an age framework was established from 1985 to 2015 based on coral oxygen isotopes to reconstruct the P/Ca change history of surface seawater in monthly resolution from 1985 to 2014. The results showed that the coral P/Ca value varied greatly in different years and seasons, with low P/Ca values observed from 1998 to 2003, generally lower than the annual average. The change in coral P/Ca ratio was highly correlated with the change in monsoon intensity (P<0.05), and the coral P/Ca value increased significantly during the monsoon and typhoon periods, indicating that the sea ~surface wind was the main factor controlling the change in seawater P content in this region. Additionally, volcanic eruptions, oil spills, and tourism can also cause a temporary increase in P content, but the effects are limited. However, there was no significant correlation between the inter-annual variations of rainfall and changes between wet and dry seasons and the P/Ca values, indicating that terrigenous materials had limited influence on the change in P content in seawater.

Key words: Weizhou Island, phosphorus, coral reefs, geochemistry

中图分类号: 

  • X145