3.7 Relationship between soil bacterial community composition
and soil physicochemical properties
RDA revealed that soil pH, AP, NH4+-N,
SWW and SBD were significant factors driving the composition of major
groups of soil bacterial communities at the phylum, class, family and
genus levels (P <0.05) (Fig. 6, Table 2). The relative
abundances of Bacteroidetes and Elusimicrobia were significantly
positively correlated with soil pH, while the relative abundances of
Actinobacteria, Planctomycotes, Chlamydiae, and Firmicutes were
significantly negatively correlated with soil pH (Fig. 6A, Table S1).
The relative abundances of Actinobacteria, unclassified_k__norank,
Planctomycetes and Chlamydiae were significantly positively correlated
with AP. The relative abundance of Proteobacteria, Bacteroidetes and
Parcubacteria was significantly positively correlated with
NH4+-N, while the relative abundance
of Acidobacter, Actinobacteria and Firmicutes was significantly
negatively correlated with NH4+-N. The
relative abundances of Proteobacteria, Bacteroidetes, Elusimicrobia,
Parcubacteria and Saccharibacteria were significantly positively
correlated with SWW, while the relative abundances of Acidobacter,
Actinobacteria, Planctomycotes and Firmicutes were significantly
negatively correlated with SWW. The relative abundances of
Acidobacterium and Chloroflexi were significantly positively correlated
with SBD.