Phytoplankton is an important indicator of biological evaluation of water quality. However, the phytoplankton functional groups can better reflect the functions of aquatic ecosystems. The present study was carried out in the biggest tributary of Ussuri River of boundary between China and Russia. We totally identified 83 species of phytoplankton, which belonging to 17 functional groups from 28 sampling sites in spring (May), summer (July) and autumn (September) in 2017. Phytoplankton functional groups abundance and biomass varied significantly (P<0.05), both seasonally and spatially. Canonical correspondence analysis revealed that phytoplankton functional groups were mainly influenced by dissolved oxygen, permanganate index, water temperature, water depth, total nitrogen and N to P ratio in this basin. Sampling sites were divided into two groups by Non-metric multidimensional scaling analysis, and six phytoplankton species were selected as indicators of river wetland. Fragilaria virescen, Fragilaria capucina and Melosira granulata were used as monitoring indicator species in eutrophic water body. Ceratium hirundinella is the representative species of β-moderate pollution water body. Cymbella ventricosa prefer disturbed site by dredging and reservoir construction especially in the midstream. Chamydomonas ovalis can be used as the indicator of meso-eutrophic status shallow water with high mixing degree from surrounding farmlands in the downstream. The study aim is to provide a scientific basis for the biodiversity conservation and management of water quality.

浮游植物是水质生物学评估的重要指标。但是，浮游植物的功能群可以更好地反映水生生态系统的功能。本研究是在中俄边界乌苏里河最大支流上进行的。在2017年的春季（5月），夏季（7月）和秋季（9月）的28个采样点中，我们共鉴定出83种浮游植物，属于17个功能组。浮游植物功能组的丰度和生物量差异显着（P<0.05），无论是在季节还是在空间上。典型的对应分析表明，该盆地浮游植物的官能团主要受溶解氧，高锰酸盐指数，水温，水深，总氮和氮磷比的影响。通过非度量多维尺度分析将采样点分为两组，并选择了六种浮游植物作为河流湿地的指标。脆virescen，脆capucina和直链藻用作富营养化水体监测指示物种。角质ceratium hirundinella是β-中度污染水体的代表物种。室翅藻尤其是在中游地区，更喜欢通过疏and和水库建设扰动受灾地点。卵圆假单胞菌可作为中度富营养状态浅水的指标，其下游下游周围农田的混合度很高。研究目的是为生物多样性保护和水质管理提供科学依据。