The influence of typhoon and Kuroshio intrusion process on the natural phytoplankton assemblages in the northeastern South China Sea (neSCS) was examined during a cruise in summer 2017. One hundred ninety-six seawater samples were collected and analyzed in the neSCS. In total, 299 species were identified belonging to 82 genera, mostly dominated by Bacillariophyta (159), followed by Dinophyta (132), Cyanophyta (4) and Chrysophyta (4). Among all, Thalassionema nitzschioides, Thalassionema frauenfeldii, Thalassiosira minima, in Bacillariophyta, Prorocentrum lenticulatum, Prorocentrum compressum in Dinophyta, and Trichodesmium thiebautii, in the Cyanophyta were the most dominated species, respectively. Correlation analysis shows compared with other groups Bacillariophyta was mostly influenced by silicate, whereas, Dinophyta and Cyanophyta showed significant correlation with temperature, salinity, phosphate, and nitrate. After the typhoon, the higher abundance of Dinophyta was observed, whereas it was lower in case of Bacillariophyta and Cyanophyta, shows typhoon “Roke“ and ”Haitang” had a significant influence on the phytoplankton assemblages, which could be manifested by the variations of total phytoplankton abundance in the surface water of neSCS. Overall, our present study provides the latest in-depth information about how the environmental factors influencing the phytoplankton density and diversity in the neSCS during summer.

在2017年夏季的一次航行中，考察了台风和黑潮的入侵过程对南海东北部（neSCS）天然浮游植物群落的影响。在neSCS中收集了196个海水样品并进行了分析。总共鉴定出299种，属于82属，其中以杆菌属（159）为主，其次是恐龙（132），蓝藻（4）和金藻（4）。在所有的， 菱形海线藻，  Thalassionema frauenfeldii， 海链极小，在硅藻， 具齿原甲lenticulatum， 原甲藻compressum 在甲藻和 束毛藻thiebautii蓝藻中的分别是最主要的物种。相关分析表明，与其他组相比，杆菌属细菌主要受硅酸盐的影响，而藻类和蓝藻与温度，盐度，磷酸盐和硝酸盐之间存在显着相关性。台风之后，迪诺藻的丰度较高，而杆菌属和蓝藻则较低，表明台风“洛克”和“海棠”对浮游植物的组合有显着影响，这可以通过总的变化来体现。 neSCS地表水中浮游植物的丰度。总体而言，我们的研究提供了有关夏季夏季环境因子如何影响neSCS浮游植物密度和多样性的最新深入信息。