自然环境变迁与十六国政权割据局面的出现

中国古代历史发展的自然环境及自然环境变迁对历史进程的影响，起一个具有重大理论和现实意义的问题。东汉末年以来自然环境变迁是西晋灭亡和十六国割据局面形成的重要原因。由于全球性寒冷干燥期的出现，我国北方沙漠面积不断扩展，各游牧民族原有的生存环境不断恶化，于是纷纷南迁，起着西晋统治集团内乱之际，夺取了政权。

Changes in Natural Environment and the Appearance of the Sixteen Separatist States

The natural environment in which Chinese ancient history developed and the impact its change had on historical progress is of great theoretical and realistic significance.The fall of the Western Jin regime and the appearance of the Sixteen States were mainly caused by the change of natural environment in the late Eastern Han Dynasty.Owing to a global cold and dry weather,desert areas expanded constantly in the North,and the natural environment where all the nomadic peoples lived deteriorated,so they were compelled to emigrate to the south,and seized power by taking advantage of the civil war among the ruling groups of the Western Jin Dynasty.