Fig. 7

Network of the top 100 dominant genera and physicochemical parameters. A connection denotes a Spearman’s correlation coefficient with a magnitude greater than 0.6 (positive correlation = red lines) or less than − 0.6 (negative correlation = green lines) and statistically significant (p-value < 0.05). The size of each node is proportional to the number of connections (i.e., degree). The thickness of each connection between two nodes (i.e., edge) is proportional to the Spearman’s correlation coefficient (i.e., weight), ranging from |0.6| to |1|. The nodes clustered in the same module share the same color. The lower right corner is a schematic diagram, and the large circles represent three modules based on network analysis, and the positions are corresponding. In the large circles, the top number indicates the number of nodes, the red circle and the number indicate positive correlation within the module, and the green indicates negative correlation. Between the large circles, red lines and numbers indicate positive correlations, and green lines and numbers indicate negative correlations