2.4 Statistical analysis and visualization
Before nutrient assessment, 10 water quality indicators were first
briefly analyzed over time. Following this, Pearson Correlation Analysis
was applied to analyze the correlation between water quality parameters.
Afterward, CA and ANOVA grouped the sampling times of the reservoirs
into clusters to analyze whether there was variability in the water
quality parameters between the clusters. Finally, the TLI method was
used to calculate the TLI( Σ ) for the three reservoirs and determine
the degree of reservoir eutrophication. In this study, the geographic
distribution of the reservoirs was drawn through ArcGIS 10.8 software,
and each monitoring indicator was statistically and analytically
analyzed using SPSS 26.0, and mapping was performed using Origin 2021
software (Liu et al., 2022).