Research on the Land Desertification of Beijing Piedmont Plain Area based on Remote Sensing Technology

As a significant factor restricting the development of Beijing, land desertification has become one of the most serious ecological environmental problems in Beijing. It is considered as an urgent demand to master the formation causes and change trend of land desertification in Beijing. The information of land desertification in Beijing piedmont plain was recognized and extracted from 2007 SPOT5 data. The result shows that Yongding River, Chaobai River, Dasha River, Kangzhuang, Nankou and their surrounding areas are the principal distributing areas. They are all fixed sand areas that mainly contain mild and moderate desertification. From the year 1999 to 2007, the total area of desertificated land in study area has the trend of decrease. However, the phenomenon of destroying at the same time as fathering still exists in some areas.