3.3 | Response of soil MBC and MBN to grazing treatment
By applying the segmental structural equation model to analyze the interaction between soil factors and soil MBC and MBN under different grazing intensities, we found that :1) In terms of grazing intensity, the effects of different grazing intensities on the influencing factors decreased with the increase of grazing intensity, and the effects of different grazing intensities were related to MBC and MBN under moderate grazing; 2) It is not difficult to find from the histogram that the total effect of SOM is the largest under any grazing treatment. It can be seen that SOM plays a major regulatory role in nutrient cycling, in addition to direct effects on soil MBC and MBN, SOM also has indirect effects on MBC and MBN, that is, by regulating other nutrients and environmental factors in the soil such as TN, TP, pH, SOM regulates the soil environment and thus indirectly and positively affects soil MBC and MBN.