Comparison of the Grassland-ecological Conceptions of Herdsmen among Three Banners in Alxa League,Inner Mongolia Autonomous Region Effects of Joint-Household Size on the Quality of Alpine Grassland: A Case Study in Maqu Country Herdsman‘s Perception and Influencing Factors about Grassland Ecological Environment Degradation Based on Household Investigation and Structural Equation Modeling in Sanjiangyuan Region, China Herdsman‘s multidimensional well-being in response of natural resources protection in the source region of the Yellow River, China: case study based on household investigation in Maduo County Adaptation of Herdsmen in Sandy Grassland to Climate Changes