valley-in-valley structure
2.The conclusions are as follows: 1)Since 1992,the absolute difference of the economic development level has been steadily expanding and the evolution of the regional industrial structure and the level of urbanization has emerged in stair distribution from the East to the West in the Changjiang River Valley.
4.The main characters of the river-valley landforms are followed: The outstandingly longitudinal range-gorge landforms constitute the unique view of three parallel rivers; the relative highness difference of the landform is great and the river valley cut deeply; the formation and evolution of the river-valley landforms are obviously controlled by the geological structure; the landforms types and the various characters of the landforms combination in the drainage area are prominent; the geological environment has relatively strong frangibility; the branches riverhead of the river-valley mostly come from high mountains and lakes, and the river-valleys of the branches along the banks have disproportional distribution.
5.This paper gives a historical description of communications and transportation, economic links and geographic division of labour, and the formation of a regional economic structure in Fujian-Guangdong-Jiangxi border area centring on Hanjiang River valley, as well as the shifting southwards of a trading centre from this very place to the lower reaches of the river.
