EVALUATZON OF ECO-SYSTEM STABILITY AND CHANGING OF LAND USE IN QINGHAI LAKE BASIN NEARLY 25 YEARS

Qinghai Lake basin in the Qingbai-Tibet Plateau alpine zone,is sensitive to global ecological change,one of the regions.In the 3s on the basis of technology,using the transfer matrix of land use,land-use dynamic degree model for a comprehensive study area revealed a 25-year LUCC spatial and temporal variation and learn from the landscape has been built elasticity index analysis of the study area landscape ecosystem stability.The results showed that: 1977~2000 Gangcha County in Qinghai Lake basin land-use types have been major changes: a gradual reduction in the number of ecological land,productive land,increasing the area of land degradation;since 1977,The county from 1987 to 2000 an area of glaciers and permanent snow cover increased significantly reduce the rate of up to 7.692 percent,while from 1987 to 2000 bare rock sandy area increasing rate increased significantly by up to 0.41 Percent,the other major types of Land area change rates continue to slow down;from 1977 ~ 2000,the degree of elasticity Gangcha County landscape continues to grow,the ability to maintain a relatively high stability of the landscape,ecosystem health is also high.