摘要：In order to elaborate the relationship between the plankton community and the water environment factors in Yongjiang River, the gray correlation analysis on the plankton community structure and the main water environmental factors was conducted. The results showed that Total Nitrogen (TN) had the maximum effect on phytoplankton abundance; Dissolve Oxygen (DO) has the minimum effect. The impacts from CODCr and BOD5 to all groups of plankton abundance were also significant. In addition, the study showed that TN and BOD5 were the main factors to affect the plankton community diversity index in Yongjiang River. By means of the grey relational grades, sequences and the measured data analysis, it is determined that TN and BOD5 were the two factors with more obvious effects on the plankton community in the Yongjiang River. Their variation resulted in significant changes in the plankton community structure.
