Biochar application ameliorated the nutrient content and fungal community structure in different yellow soil depths in the karst area of Southwest China.

Notably, the experimental results also showed that biochar application significantly reduced the MBC content and showed a decreasing trend with increasing soil depth, which may be related to the higher rate of microbial N fixation than total N mineralization ( Mcclellan et al., 2010 ; Dempster et al., 2011 ). 4.2 Effects of biochar on the diversity of soil fungal community structure Soil microorganisms drive the material cycle in the soil, and the composition and structure of soil microbial communities have a strong influence on soil material cycling due to differences in their physiological characteristics ( Ali et al., 2022b ).

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