Figure 4.
Correlation and cluster analysis at the species level. (A) Correlationships between microbial abundance, genera belonging to rhizobia and soil chemical properties. (B,C) show the results of clustering analysis based on rhizobia (at the species level) in soils of the wheat and soybean seasons, respectively. (D) Shows the relative abundance of Bradyrhizobium diazoefficiens in soil samples and their correlation with N fertilizer. W soil samples in the wheat season, S soil samples in the soybean season.