Abstract:

In this study 5 sampling sites in Pengxi River, the largest tributary of the Three Gorges Reservoir on the northern shore were chosen and sampled in March and May of 2009, respectively, to research the properties of the zooplankton community by using Margalef Abundance Index (d), Shannon-Wiener index (H) and Pielou Evenness Degress Index (J). It was found that the result of assessing water quality by water nutrient concentrations was different from that through zooplankton property. The latter assessment concluded a better water quality than water quality conclusion from the former one.