[ Objective ] To discuss the effect of southeast coastal upwelling in Haitan island of northwestern Taiwan Strait on the surface sedi-menlary diatom. [Method] With the surface sedimentary diatom in Haitan island southeast coast of northwestern Taiwan Strait as the material,they were made for screening, slice making and observing to research their genera and species distribution characteristics and the effect of up-welling on them. [ Result] According to the abundance distribution characteristics of the surface sedimentary diatom, they were divided into three study areas. The mainly dominant species were Nptychus undulates ( Bail ) Rafts, Melosira sulcata ( Her. ) Kutzing and Cyclotella stylo-rum Brightwell. Combining with the data of temperature and salinities, it was concluded that the upwclling in Haitan island southeast coast of northwestern Taiwan Strait existed. [ Conclusion ] The study provided scientific basis for further discussion on the relationship between the up-welling and the surface sedimentary diatom in Haitan island southeast coast of northwestern Taiwan Strait.%[目的]探讨台湾海峡西北部海坛岛东南沿岸上升流对表层沉积硅藻的影响.[方法]以台湾海峡西北部海坛岛东南沿岸的表层沉积硅藻为材料,对其进行筛选、制片、观察,研究其属种分布特征和上升流对其的影响.[结果]按照表层沉积硅藻的丰度分布特征,将其分为三个研究区,以柱状小环藻、具槽直链藻和波状辐裥藻为主要的优势种群.结合温度、盐度的资料,可以得出海坛岛东南沿岸海域存在上升流.[结论]该研究为进一步探讨海坛岛东南沿岸海域表层沉积硅藻与上升流的关系提供了科学依据.
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