In addition, there was a significant negative correlation between PH and both TN and EC ( p < 0.05), and a highly significant negative correlation between MBC and MBP and SOM and SOC ( p < 0.01): a highly significant positive correlation between the MBP ratio and SOM, SOC, EC, AN, AP, AK and acid phosphatase ( p < 0.01).
Conversely, the abundance of Basidiomycota exhibited an increasing trend followed by a decrease with increasing fertilizer application at low and medium planting densities, consistent with previous studies ( Chen et al., 2014 ).
However, at high planting densities, Basidiomycota abundance showed a decreasing trend with increased fertilizer application, likely affecting gas exchange with the external environment.