The evaluation result of Shannon-Wiener diversity index
is that
all six sampling sites
belong to - mesosaprobic zone.
The evaluation result of Margalef richness index is that pollution levels of five sampling sites belong to -mesosaprobic zone except the sampling site of Qingju lower dam, which belongs to -mesosaprobic zone. However, the assessment result of Pielou evenness index is that all sampling sites are light polluted. By synthesizing the above-mentioned assessment results of three types of biological diversity indexes, it can be concluded that water quality in Nanchong of Jialing River is contaminated, which belongs to -mesosaprobic zone.