3.6 | Relationships between soil microbial communities and soil physicochemical properties
To explore the influence of soil environmental factors on soil bacterial communities, the relationships between microbial preponderant phyla and the main soil properties were analyzed using Spearman’s correlation heatmap. At the phylum level, environmental factors and the 20 most abundant bacterial communities were correlated with the depth, slope position, and forest types (Figure 7). The results of the depth and slope position were the same. Approximately seven bacterial phyla were significantly correlated, five were negatively correlated, and two were positively correlated with AK. Five bacterial phyla were significantly correlated, one was negatively correlated, and four were positively correlated with pH. Five phyla were significantly correlated with the concentration of AN. The concentrations of AP, NH4–N, and SMC were significantly correlated with four phyla. No bacterial phyla were significantly correlated with NO2–N in the different forest types. Forest type has been found to have a potential impact on the bacterial microbial community and has led to differences in the microbial abundance.