Quantitative Analysis of Succession Law of the Alpine Meadow Under the Different Grazing Intensities Effect of Grazing Intensities on Vegetation and Soil in Meadow Steppe A Study of the Effects of Different Grazing Intensities on Soil Physical Properties Soil respiration of Hulunber meadow steppe and response of its controlling factors to different grazing intensities Fine-scale spatial pattern of Artemisia frigida population under different grazing intensities