Abstract:

In order to provide theoretical guidance for ecological barrier construction of the Three Gorges reservoir, with remote sensing data, digital elevation model and various survey data, using the method of AHP and GIS, the author analyzed and evaluated the land eco-security situation of the Yangtze River region of Fengdu County based on grid unit. The results showed that the proportion of serious-warning, moderate-warning, light-warning, relatively safe and safe area were 0.15%, 5.36%, 41.85%, 46.07% and 6.57%，respectively. The state of land eco-security mainly was relatively safe and light-warning; but the state of land eco-security of the ecological barrier mainly was moderate-warning and serious-warning, this area was the most vulnerable area of the Yangtze River region of Fengdu County. Study proved that the state of land eco-security in the south of Yangtze River was good, but contrary in the north which ecological degradation was very seriously. Through the land eco-security evaluation, people were aware of the land eco-security pattern and formation reason, which provided a useful reference to the construction of land eco-security pattern.