Qilian Mountains are rich in grassland resources with extensive types, which are the dominant bases of animal husbandry in Northwest China. During the past 50 years, the grassland management in the Qilian Mountains is undergoing great changes, especially in the agro-pastoral ecotone of northern slopes, which are mainly for the grassland enclosing, cultivation, abandonment and returning cultivation to grassland. In this study, the main changes of grassland management in the eastern, middle and western areas ...