Effects of sward cleavage on soil characteristics and underground biomass in different terrains of alpine meadows-steppe Analysis of soil respiration under different grazing management patterns in the alpine meadow-steppe of the Qinghai-Tibet Plateau Ecological Responses of Belowground Biomass and Soil Characteristics to Different Grazing Rest Modes in Alpine Meadow-Steppe Changes of Vegetation Characteristics in Alpine Meadow-steppe of Eastern Qilian Mountains after Different Grazing Rest Modes Effects of Grassland Cultivation Measures on Plant Diversity and Productivity in the Alpine Meadow-Steppe