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.