3.5 Relationships between soil bacterial, fungal community and soil properties
Redundancy analysis (RDA) depicts the relationships between dominant phyla of soil bacterial and fungal communities and nine selected soil physicochemical properties and microbial biomass (Fig. 5). RDA showed that pH (r2=0.91, p=0.001), TN (r2=0.76, p=0.035), and MBN (r2=0.73, p=0.005) were the most significant environmental factors explaining variability in bacterial community composition, with the first two axes accounting for 59.57 and 15.16% of the total variation (74.73%), respectively (Fig. 5a). Proteobacteria, Firmicutes, and Bacteroidetes were negatively correlated with pH and MBC/MBN, while significantly positively correlated with other properties; Acidobacteria were negatively correlated with pH, TN and AN. RDA showed that MBN (r2=0.84, p=0.001), pH (r2=0.76, p=0.001), AN (r2=0.78, p=0.001) and MBC (r2=0.79, p=0.001) were the most significant environmental factors explaining variability in fungal community composition, with the first two axes accounting for 22.78 and 12.22% of the total variation (35.0%), respectively (Fig. 5b). Ascomycota and Chytridiomycota showed a positive correlation with pH and MBC/MBN, and a negative correlation with other soil properties; Basidiomycota showed a positive correlation with pH, SOC, MBN, and AK.
Discussion