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.