5 | DCONCLUSION
The effects of grazing on the limited growth alpine meadow ecosystem of
the Qinghai-Tibet Plateau can be summarised as follows: 1) environmental
conditions, especially the soil environment, significantly affect the
response of the alpine meadow ecosystem to grazing; 2) SOM is the main
controlling factor in the soil material cycle, which controls both
aboveground vegetation growth and belowground microbial biomass; 3)
grazing increases the activity of soil microorganisms by activating the
microbial stimulation effect, thereby accelerating the consumption of
soil nutrients and increasing the release of CO2. At the same time,
grazing creates nutrient competition with above-ground vegetation, which
is an important factor in vegetation degradation. The continuous
increase of the microbial stimulation effect may threaten the soil
carbon sequestration function of grassland; 4) In actual production,
light grazing is the best choice for alpine meadows with poor growing
conditions.