Analysis of Landscape Pattern Changes of Alpine Wetland in Zoigê

In this paper,the TM images of 1990,2000 and 2009 were used as the main datasources,and analysis was made of the dynamic characteristics of the landscape pattern of wetland in Ruoergai by means of using 3S technique,aiming to explore the wetland change law in Zoigê County for the recent 20 yeas. The results showed that in the recent 20 years, the Zoigê wetland landscape patch number decreased generally, the wetland landscape area displayed a shrinking trend,the wetland landscape diversity was a balanced development, and various types of patch area had a big difference, exhibitina uneven distribution and landscape fragmentation. Therefore,the protection of Zoigê wetland should be further strengthened for the purpose of controlling the wetland landscape pattern change and scientific and rational use of resources.