基于熵权的北京城市生态系统健康模糊综合评价

An entropy weight approach on the fuzzy synthetic assessment of Beijing urban ecosystem health,China

采用基于熵权的模糊数学评价方法,借助于相对隶属度的概念评价了北京城市生态系统在某一特定时间内(1996～2003年)的相对健康状态.方法避免了主观判断城市生态系统健康标准的不确定性.评价结果表明:(1)1996～2003年,北京市相对健康状态整体呈上升趋势,最优年为2003年,最差年为1996年;(2)按照最大隶属度原则,人类健康要素的最大隶属度0.967(2002),生物群落的最大隶属度1.000(2003),社会的最大隶属度1.000(2003),经济的最大隶属度0.938(2003),人工环境的最大隶属度1.000(2003),自然环境的最大隶属度0.795(1998),自然与社会经济的相互作用的最大隶属度0.916(2002),对区域的影响的最大隶属度1.000(1996).各评价要素的最大隶属度主要集中于2003年,其概率为37.5%.

This research assessed the health conditions of the Beijing urban ecosystem from 1996 to 2003 through use of a fuzzy logic approach on entropy weight. The relative membership method used here avoided the uncertainty in estimating the standard of urban ecosystem health subjectively. The results showed that： （1） The relative health status of Beijing urban ecosystem health increased from 1996 to 2003. The most healthy year was 2003, and the least healthy year was 1996. （2） Based on the maximum membership degree principle, the maximum membership degree in human health group was 0. 967 （2002）, in biotic community group was 1.000 （2003）, in social group was 1.000 （2003）, in economic group was 0. 938 （2003）, in built-up environment group was 1. 000 （2003）, in natural environment group was 0. 795 （1998）, in interaction group between natural and social economic environment was 0. 916 （2002）, and in the impact on larger ecosystem group was 1. 000 （1996）. The maximum membership degree among all groups was in 2003, with a probability of 37.5%.