辽西大凌河流域生态安全评价

生态安全包括自然生态安全、经济生态安全和社会生态安全，尤指自然和半自然生态系统的安全，即生态系统完整性和健康的整体水平反映.通过专家评议，从生态系统的状态-压力-效应3个方面选取28项指标，对辽西大凌河流域不同时期的生态安全进行综合评价.结果表明，1987年(7.48)与2002年(7.51)大凌河流域生态安全处于良好状态，但2002年面临的生态压力比1987年增加了32.5%.1987～2002年大凌河流域生态安全水平没有显著下降的主要原因是朝阳市政府实施了大规模的小流域治理.大凌河流域2002年生态状态和生态效应分别是1987年1.29和1.42倍.

Ecological security assessment of Daling River watershed in West Liaoning Province

Ecological security covers natural ecological security, economic ecological security, and social ecological security. The particular points of natural and semi-natural ecosystem security encompass the integrity and health of the ecosystem. Ecological security describes a state that the area, country, and even global ecological environment are not threatened, which may provide ecological guarantee for the sustainable development of whole ecological-economic system. To construct the comprehensive index system of ecological security assessment of Daling River watershed, a total of 28 indices were chosen from the aspects of ecological status, ecological press, and ecological effect. The results showed that the integrated assessment values of 1987 and 2002 were 7.48 and 7.51, respectively, indicating that the ecological security of Daling River watershed was well, whereas the ecological press of 2002 was increased by 32. 5% , compared with that of 1987. The main reason of the constant ecological security of Daling River watershed was the implementation of catchment management, which made the ecological status and ecological effect of 2002 be 2.29 and 2. 42 times higher than that of 1987, respectively.