中文摘要：

2013年春季和夏季对长岛周边海域进行了环境与生物综合调查,利用多元统计分析对长岛周边海域浮游植物分布及其影响因素进行分析。根据水环境分析结果对调查海域进行聚类分析,结果表明,春季（M1、M2）与夏季（A1、A2）均可分为两大类。M1与A2为高温高营养盐区,M2与A1为低温低营养盐区。调查期间,共发现69种浮游植物。硅藻为两季主要浮游植物,春季浮游植物细胞丰度远大于夏季。春季共发现1种明显的优势种,为柔弱几内亚藻（Guinardia delicatula（Cleve）Hasle）。夏季共发现5种优势种,分别为具槽帕拉藻（Paralia sulcata）、裸甲藻（Gymnodinium sp.）、圆筛藻（Coscinodiscus sp.）、离心列海链藻（Thalassiosira eccentrica）与具齿原甲藻（Prorocentrum dentatum）。影响春季浮游植物分布的最佳解释变量组合为温度（WT）、透明度（SD）、风速（WS）和溶解总碳（DTC）组合,其中,温度影响最显著（极显著负相关）;夏季则为盐度（S）、活性磷酸盐（SRP）和N/Si组合,其中活性磷酸盐影响最大（显著负相关）。

英文摘要：

Environmental and biological investigation were conducted in waters surrounding Changdao Island in the spring and summer of 2013. The distribution of phytoplankton and its environmental impact factors were investigated in multivariate statistical analyses. According to the results of investigation and analysis of this water environment by cluster analysis, the waters surrounding Changdao Island could be divided into two categories in spring（M1and M2） and in summer（A1 and A2）. A total of 69 taxa were identified. Diatom was the main phytoplankton in both seasons. The abundance of phytoplankton in spring was greater than that in summer. There was one dominant species, Guinardia delicatula（Cleve） Hasle, in spring. There were five dominant species（Paralia sulcata, Gymnodinium sp., Coscinodiscus sp., Thalassiosira eccentric, and Prorocentrum dentatum） in summer. The best explanations among the variables affecting the distribution of phytoplankton in spring were temperature（WT）（very significant negative correlation）, transparency（SD）, wind speed（WS）, and total dissolved carbon（DTC）; in summer, the corresponding variables were salinity（S）, soluble reactive phosphate（SRP）（significant negative correlation）, and N/Si.