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汉唐时期北方游牧部族部落南迁,多至蒙古高原游牧经济生态圈南缘的阴山—河套地区,合黎山、龙首山和燕山—滦河上游及大小凌河流域一带。这里为北方游牧部族部落冬南夏北的游牧生产活动提供了春冬牧场。适于游牧生活的自然条件及近邻农耕地区和商贸路线的地理位置,为游牧民的生存、生活提供了必要的保障,成为不同时期北方游牧部族部落南下迁居这一带的经济地理因素。
During the Han and Tang dynasties, the nomadic tribal tribes in the north migrated to the Yinshan-Hetao area, the Heshidao area, the Longshoushan and the Yanshan-Luanhe River and the Lulinghe River basin in the southern edge of nomadic economic ecosystem in the Mongolian Plateau. Here for the northern nomadic tribal tribes winter north of the nomadic production activities provided spring and winter pastures. The natural conditions suitable for nomadic life and the geographical location of the neighboring farming areas and commercial routes provide the necessary protection for the survival and living of nomads and become the economic and geographical factors in the migration of the nomadic tribal tribes to the south in different periods.