highly significantp < 0.01
Phytoplankton Community Structure About Environmental Factors Table 8 indicates that diversity index ( H’ ) and richness ( D ) exhibited a highly significant positive correlation with salinity ( p < 0.01) and a highly significant negative correlation with water temperature, nitrate nitrogen content, nitrite nitrogen content, and ammonia nitrogen content, respectively ( p < 0.01); the evenness ( J ) demonstrated a completely contrary relationship to H’ and D .