Acta Geographica Sinica ›› 2010, Vol. 65 ›› Issue (5): 595-604.doi: 10.11821/xb201005008

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Regional Geographical Differences Affected by the Ailao Mountains-Yuanjiang River Valley

FENG Yan; LI Yun-gang   

  1. Asian International Rivers Center; Yunnan University; Kunming 650091; China
  • Received:2010-01-08 Revised:2010-04-01 Online:2010-05-25 Published:2010-05-25
  • Supported by:

    National Nature Science Foundation of China, No. 40971091; National key Basic Research Program of China (973 Program), No.2003CB415105

Abstract:

The Ailao Mountains were considered as the natural borderline between the east and the west of Yunnan for a long time. Are there any differences showed by social and economic elements between the two sides? In view of this, in the region between 22°50'-24°50'N and 100°46'-103°47'E where the Ailao Mountains and the Yuanjiang-Red River Valley were mainly located, 10 counties along both sides of 5 sections with a distance of around 0.5 latitude each were considered as the research spots. Some factors, including natural conditions, economic development, farming structure and net income were contrasted and analyzed. The major research results were obtained in the following. (1) The height fall, land suitable for farming, rainfall and water resource in the west were bigger, less and richer than the ones in the east, showing that the natural condition had obvious differences between the two sides; (2) The farming structure, the planting proportions of cash crops and rainfed crops in the east were higher than the ones in the west, indicating that the farming structure between the east and the west had obvious differences, and the farming structure on each side had a similar changing tendency among the 5 latitude sections; (3) The economic development status, per capita GDP, output value of agriculture and net income of farmers in the east were much higher than the ones in the west, which proved that the development level and the developing tendency at the spatial and temporal scales between the two sides had larger differences, and on each side, they were more consistent. According to the above analysis, the Ailao Mountains-Yuanjiang River Valley was not only the natural borderline, but also the social-economic borderline in the region.

Key words: Yunnan, the Ailao Mountains, Yuanjiang-Red River Valley, geographical difference, borderline

CLC Number: 

  • P942