基于灰色极大熵原理的三峡库区(重庆段)生态系统健康评价

Ecosystem health evaluation of Three Gorges reservoir area (Chongqing) based on the theory of maximum entropy and grey system

三峡库区(重庆段)是典型的河道型水库生态脆弱带,生态系统本底条件较差.明确库区生态系统健康状况及其胁迫因子,对促进库区可持续发展、维护三峡库区生态安全具有重要的现实意义.针对三峡库区(重庆段)目前的生态系统特点,构建了自然-社会-经济复合生态系统健康状况评价指标体系,并在灰色系统理论基础上,将信息论中Jaynes最大信息熵原理引入到生态系统健康评价当中,对三峡库区(重庆段)复合生态系统健康进行了评价.结果表明,三峡库区(重庆段)生态系统正处于急剧变化的过渡阶段,生态系统的生产、调节和服务功能分异明显.三峡库区(重庆段)生态系统东段的健康程度总体上好于西段,但东段内部空间分异明显,结构复杂.针对三峡库区(重庆段)现存的生态环境问题,提出了相应的调控措施和途径.

The Three Gorges reservoir area （Chongqing） is a typical channel reservoir,an ecologically fragile zone,and relatively poor in its natural ecosystem conditions. To promote sustainable development in the reservoir area and protection of its ecological security,the ecosystem＇s health status and its stress factors need to be clarified. According to the characteristics of the local ecological system,a natural-social-economic health evaluation index system of the complex ecosystem was constructed. And on the basis of the grey system theory,the Jaynes maximum entropy principle in information theory was introduced to evaluate the ecosystem health of the Three Gorges reservoir area （Chongqing） . The results show that the Three Gorges reservoir area （Chongqing） ecosystem remains in a transitional stage of rapid change. The functions of production,regulation and services are significantly different. The health condition of the eastern section of the Three Gorges reservoir area （Chongqing） ecosystem is better than the western section,but the interior of the eastern ecosystem is apparently different and has complex structure. Corresponding measures are proposed to solve the problems above.