A comparative study of methods for monitoring plant diversity in montane shrub grassland in the Lhasa River Basin Effect of 3-year fencing on soil seed banks of three alpine grassland communities Effect of Yak Grazing Intensity on Species Diversity of Dasiphora fruticosa Shrub Grassland Communities Soil Properties of Different Alpine Shrub Grasslands in Eastern Qilian Mountains The Flora Characteristics of Graszing Botriochloa ischaemum Shrub Grassland Variation in the biodiversity of montane shrub grassland communities along an altitudinal gradient in a Lhasa River basin valley