Composition of rhizosphere soil bacterial and fungal
communities
The composition of bacterial and fungal communities at the phylum level
is shown in Figure S1. Six bacterial phyla with relative abundances
higher than 1% were detected, namely, Acidobacteria, Proteobacteria,
Chloroflexi, Actinobacteria, Planctomycetes and Bacteroidetes. Four
fungal phyla with relative abundances higher than 1% were detected,
namely, Basidiomycota, Ascomycota, Mucoromycota, and one unidentified
phylum (Unclassified_k_Fungi). Based on the above bacterial and fungal
data, taxonomic differences in the rhizosphere microbial communities of
the different samples were analyzed (Figure 2, Table S3-S8). In terms of
the bacteria, the relative abundance of Acidobacteria increased with
increasing carbon sequestration ability. The difference in its abundance
between the medium and high families was not significant, while the
differences between the medium and low samples and the high and low
samples were significant. The
relative abundance of Proteobacteria declined with increasing carbon
sequestration ability. There was no significant difference in its
abundance between the middle and high samples, while the differences
between the medium and low samples and the high and low samples were
significant. The other phyla showed no significant differences among the
three samples. This indicated that the carbon sequestration process in
Masson pine might have a positive effect on Acidobacteria and a negative
effect on Proteobacteria. In terms of the fungi, the relative abundances
of Basidiomycota and Unclassified_k_Fungi increased with increasing
carbon sequestration ability. The relative abundances of Ascomycota and
Mucoromycota decreased with increasing carbon sequestration, but in
general, the relative abundance of the four main fungi did not show
significant differences among the different samples.