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.