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.