Analysis on Grey Correlation Between Zooplankton Diversity and Water Quality in Culture Pond Based on Two Kinds of Biological Floating Beds

【Objective】Taking the culture ponds with two kinds of biological floating beds as the research object, the diversity of zooplankton in pond and its correlation with water quality factors were studied.【Method】The species Vcomposition of zooplankton and main water quality factors in the ponds of Pelteobagrus fulvidraco cultured in two kinds of biological floating beds were monitored regularly and the effects of water hyacinth floating bed and alligator weed floating bed on the diversity of zooplankton were compared. Grey Relational Analysis was used to analyze the correlation of 10 physicochemical factors of water, such as WT, DO, pH, NH3-N,COD and the Shannon-Wiener diversity index (H) and Pielou evenness index (J) of zooplankton.【Result】The results showed that the abundance and diversity of zooplankton in water hyacinth floating bed ponds were higher than those in alligator weed floating bed ponds, and the water quality of water hyacinth floating bed ponds was stable during the culture cycle. The dominant species zooplankton was rotifer. Among the water quality factors, the pH value was the first factor affecting H and J, with the correlation degree of 0.863, 0.797 and 0.901, 0.825, respectively, followed by WT and DO. The influence of main water quality factors on H and J ranked as follows: pH > WT > DO > COD > SD > BOD5 > NH3-N > TN > TP > NO2-N.【Conclusion】Among the many water quality factors, pH is the primary key factor affecting the diversity of zooplankton, followed by WT and DO. The water hyacinth floating bed can better regulate the population structure of zooplankton than the alligator weed floating bed.