北京城市生态系统的能值动态分析

Analysis of Emergy Dynamice in Beijing Urban Ecosystem

采用能值理论与分析方法,对北京市1990~2001年间的能值结构动态进行了分析,并采用人均能值、能值密度、生态功能潜力、人口基本承载力、能值自给率、能值货币比率、环境负载率、输入能值比等重要能值指标对该时期北京市城市生态系统的能值状况作了详细分析。研究表明,北京城市生态系统正处于较高发展水平,已基本跨入发达国家水平的行列;但高强度、快速发展给本市带来了巨大的生态环境压力,未来北京的可持续能力建设已势在必行。文章也提出了北京城市生态系统可持续发展能力建设的基本方向。

The changes in the emergy structure of Beijing urban ecosystem were analyzed with Emergy method from 1990 to 2001,some indicators of emergy were selected such as per capita emergy,the density of emergy,the potential of ecological functions,the basic carrying capacity of population,the self-supporting rate of emergy,and so on,and the dynamics of emergy of the city were assessed.The research result shown that Beijing urban ecosystem developed up to a higher level,but the city also faced great challenges from ecological and environmental pressures and it was an urgent task to strengthen the capacity building of sustainability for the city development.Some key areas for this capacity building also were presented.