Evaluation on ecologic safety of Chongqing

With the development of economic construction, people have higher requirements to the living ecoenvironment. Taken Chongqing as the example, 17 indicators are built based on the pressure state response conceptual model. Ecological security dynamic assessment and ecological safety spatial assessment in Chongqing are analyzed with the fuzzy membership degree method. The results show that the ecological security value in Chongqing is 2.384 and 2.114 in 1997 and 2002, belonging to insecurity state, and 1.704 in 2007, belonging to critically safe. The ecological security in Chongqing in 2007 distribute as follow: there are 13 districts in more secure area（1.0≤B*＜1.5）in west Chongqing, which attains 1.414 2×104 km2 and accounts for 17.16% of the total area; 11 districts in critical security zone（1.5≤B*＜2.0）in northwest Chongqing, which attains 1.539 3×104 km2 and accounts for 18.68% of the total area; there are 12 districts in unsafe areas in southeast and northeast as well as the middle areas of Chongqing, which attains 3.952 3×104 km2 and accounts for 47.96% of the total area; and that there are 4 districts in very unsafe area in northeast and southeast Chongqing, which attains 1.334 5×104 km2 and accounts for 16.20% of the total area.