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Abstract The record of the development of a region is a changing history of ethnic groups that inhabit this region . The theme of the thesis is to treat a regional development as a change of its human ecological system . In addition , studying the history of different ethnic groups'' developing aei-yuan (泰源) Basin enables us to delineate the changes of the spatial relationship among ethnic groups in this living sphere , the features of different ethnic groups'' livelihood ,and above all , the overall changing history of this region . In a sense , the groundwork of this thesis is to unfold the interactive relationship among the progress of the horizontal elements including the distribution of ethnic groups , the cultivated areas , etc. and the vertical elements including ethnic groups'' living sphere , agricultural features , and the situation of population growth . Furthermore , the approach of the ethnic groups'' genre de vie , say , the contents of the livelihood and the role they play is applied to explicating the development of the region .
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