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，被广泛用于重建海水P含量高分辨率变化历史。本研究以涠洲岛西北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年珊瑚P/Ca的月分辨率变化历史。结果显示珊瑚P/Ca值不同年份、季节变化较大，在1998~2003年之间珊瑚P/Ca值含量较低，普遍低于年平均值。珊瑚P/Ca比值变化与季风变化存在极大相关性（p＜0.5），季风、台风盛行期珊瑚P/Ca值明显增加，说明海表风是该区域海水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。而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。

The change of phosphorus(P) content in surface seawater is an important parameter to evaluate the nutrient content of Marine ecosystem, and plays an significant role in regulating the evolution of the earth environment. Weizhou Island is the largest and youngest volcanic island in China. The change of surface phosphorus content in seawater is not recorded on a long time scale, and the influencing factors are not yet clear. Coral bone P/Ca is a reliable index for the retrieval of seawater phosphorus content, and is widely used to reconstruct the high-resolution history of seawater phosphorus content. In this study, continuous growing corals in 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 monthly resolution P/Ca change history of surface seawater from 1985 to 2014. The results showed that the coral P/Ca value varied greatly with different years and seasons, and the coral P/Ca value content was low from 1998 to 2003, which was generally lower than the annual average value. The change of coral P/Ca ratio was highly correlated with the change of monsoon (p＜0.5), 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 of seawater P content in this region. In addition, volcanic eruptions, oil spills and the development of tourism can also cause a temporary increase in P content, but the effect is limited. However, there was no significant correlation between the inter-annual and wet and dry seasonal variations of rainfall and P/Ca values, indicating that terrigenous materials had limited influence on the change of phosphorus content in seawater.