Abstract
Using the technology of remote sensing, geographical information system, global positioning system and the analysis software of landscape pattern, the paper analyzed 4 sensing images of Tetraena mongolica distribution area in different periods. The dynamic changes of landscape composition and landscape patterns and its impact on the ecological environment was analyzed and discussed. The results showed that the landscape composition in study area has been changed largely and T.mongolica population area has been reduced while the area of farmland, town and industry land, desertification land and else vegetations have been increased. On landscape scale, diversity index increased while dominance index dropped year after year. It indicated that the landscape pattern tend to be fragmented and heterogeneity. It has resulted in the landscape stability and anti-interference ability declined, bring about region ecological environment security questions such as land degradation, environment pollution and biodiversity loss.
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