Figures and Tables Legends
FIGURE 1 Soil salinity (a) and pH (b) in the saline-alkali soil.
Different lowercase letters represent significant differences (p ≤0.05).
Means ± standard error (n = 3). CK, bare soil; BS, bulk soil of Melia
azedarach L.; RS, rhizosphere soil of Melia azedarach L.
FIGURE 2 Concentrations of extractable soil elements, including Na (a),
Mg (b), K (c), Ca (d) and Cl- (e) in the saline-alkali
soil. Different lowercase letters represent significant differences (P
≤0.05). Means ± standard error (n = 3). CK, bare soil; BS, bulk soil ofMelia azedarach L. ; RS, rhizosphere soil of Melia azedarach
L.
FIGURE 3 Soil enzyme activities, including alkaline phosphatase (a),
urease (b) and catalase (c) in the saline-alkali soil. Different
lowercase letters represent significant differences (P ≤0.05). Means ±
standard error (n = 3). CK, bare soil; BS, bulk soil of Melia
azedarach L. ; RS, rhizosphere soil of Melia azedarach L.
FIGURE 4 Venn diagram of the OTUs of bacteria (a) and fungi (b) in
different soil samples. CK, bare soil; BS, bulk soil of Melia
azedarach L. ; RS, rhizosphere soil of Melia azedarach L.
FIGURE 5 PCA analysis of bacteria (a) and fungi (b) based on OTUs. CK,
bare soil; BS, bulk soil of Melia azedarach L. ; RS, rhizosphere
soil of Melia azedarach L.
FIGURE 6 Comparison of relative abundance of bacterial (a) and fungal
phyla (b). CK, bare soil; BS, bulk soil of Melia azedarach L. ;
RS, rhizosphere soil of Melia azedarach L.
FIGURE 7 The LDA scores distribution histograms (b, d) showing taxa with
significantly different abundance. The differences are mapped to
cladograms (taxonomic trees) (a, c), with bacteria in the top part and
fungi in the bottom part. Note: CK, bare soil; BS, bulk soil ofMelia azedarach L. ; RS, rhizosphere soil of Melia azedarach
L. In the cladograms, the taxa associated with small circles and the
shading in the colour of a specific soil played an important part in the
microbial community in that soil (significantly different from other
soils). The diameter of the small circle represents relative abundance
of the taxa. The taxa without a significant difference are coloured
yellow.
FIGURE 8 Correlations among soil physico-chemical and enzymatic
properties. The pairwise comparisons are shown, with a color gradient
denoting Spearman correlation coefficients. The non-significant
correlations (P > 0.05) are not shown.
FIGURE 9 Redundancy analysis of soil physico-chemical properties with
bacterial (a) and fungal taxa (b). The arrows represent environmental
factors, and the arrow length indicates a degree of correlation between
environmental factors and microbial communities. CK, bare soil; BS, bulk
soil of Melia azedarach L. ; RS, rhizosphere soil of Melia
azedarach L.
TABLE 1 Soil nitrogen, phosphorus, potassium and organic matter
TABLE 2 Alpha Diversity Indices
TABLE 1 Soil nitrogen, phosphorus, potassium and organic matter