The Temporal-Spatial Changes on Desertification and Salination of West Jilin Province Based on RS Technology

摘要

The west of Jilin province lies in the center of Song-liao plain, which was once an important stockbreeding base in the province and one of the perfect natural pastures in China, while now where ecological environment becomes worse and the "Three Deteriorate" are serious. The whole west of Jilin was made in the severe ecological crises because of a lot of factors, such as weather, over-browse, irrational land utilization, and so on, since 1980s. With the problems of "Three Deteriorate" is increasing, which have greatly effected the environment of economic development and people lives. So it has important reference value to control "Three Deteriorate", and implement specific measures to improve ecological environment. This article applied remote sensing technology to analyze the image information of land desertification in the west of Jilin province in 1980s and in 1990s, and establish all kinds of image interpreted symbols on environmental features such as physiognomy, grass, water system, salina, sand land, vegetation and so on. Based on the different time scale of remote sensing data, linking with the information of the land utilization, vegetation evolvement and climate change currently which investigated on the site, we established basic database of desertification in the west of Jilin province, found out the temporal-spatial distribution rule of "Three Deteriorate" phenomenon by the analysis among different period image information, and made a conclusion on the correlation among the desertification, the salinization and meadow degeneration. Based on the natural situation of West Jilin province, it is essencial to take measures to protect the ecological environment by transfer the water from the north to the south, to improve the cycle between the ground water and surface water, and to accelerate the restoration of wetland resources.