ANALYSIS OF PHYTOPLANKTON COMMUNITY STRUCTURE AND RESOURCE MANAGEMENT BASED ON FUNCTIONAL GROUPS IN THE ASHI RIVER, NORTHEAST CHINA

A three-quarterly survey and analysis of phytoplankton and environmental factors in the Ashi River basin was conducted from May 2022 to October 2022.It aims to explore the characteristic dynamics of phytoplankton functional groups in Ashi River basin and their relationship with environmental factors.We totally identified 54 species of phytoplankton in 7 phyla were identified and divided into 14 functional groups.There are six dominant function groups, namely C, D, J, MP, N and Y. Seasonal variation is manifested as spring (D)summer (D/Y)autumn (D).The results of redundancy analysis (RDA) showed that Chl-a and CODMn were positively correlated with functional group C, Cl - and BOD5 were positively correlated with functional group Y, DO and pH were positively correlated with functional group D. Conversely, NH4 + -N, NTU and WT were negatively associated with the dominant phytoplankton functional groups.The main pollutants in the Ashi River basin are TP and TN.Aquatic biodiversity conservation strategies are recommended.According to the diversity needs of aquatic organisms in different regions, the necessary auxiliary measures are taken to maintain the aquatic biodiversity, integrity and specificity.