Abstract:

It is important to study the land use change and influencing factors of the paralleled ridgevalley region of East Sichuan because of its great ecological status.Using Landsat TM images of 1986,2000 and 2007,supplemented by SPOT images of 10 m resolution and field surveys,the spatial pattern,the changing track and the corresponding ecological effect of land use/cover of this region were discussed by use of synthetic index of land use extent and land use impact index in this paper.In the study area,it is obvious that land use pattern is under control of the terrain spatial differentials.From 1986 to 2007,land use change in general was characterized by the increase of construction land and water body and the reduction of arable land.The change of arable landconstruction land accounted for 6647% of the total change of 1986~2007.The increase of construction land was mainly due to the fact that some arable land turned to construction land after 2000.Land use degree index of the banded ridgevalley region near the main city increased faster than that of the other farther areas.The factors of land use change of the study area were ascribed to traffic road network effect in main urban area of Chongqing,the node effect of traffic line in the ridgevalley region as well as land use change caused by river corridor.On the whole,the increase and enhancement of the land use effect were larger than the recovery and the reduction of it.The further studies are required to reveal the evolution process of land use and the mechanisms for the maintenance of landscape ecological diversity under the comprehensive effect of the traffic road network driving effect of the paralleled ridgevalley region and the low mountain obstructing effect,and to simulate the optimized land use pattern under the traffic road network driving effect and in the condition of ecological safety