【摘要】 城市是一个人工生态系统，它是通过生态流（即物流、能流、信息流）联系内部的各组成成分 和要素，发挥城市功能的。本文运用生态学和生态工程的基本原理以及“４Ｒ”原则，阐明了生态流 的功能，探讨如何从物流、能流、信息流的角度提高生态流效率，保证生态流的畅通，进而实现城市 的可持续发展。更多还原

【Abstract】 As an artificial ecosystem, urban ecosystem depends on ecological flows(energy flow,matter flow and informational flow) for connecting the essential factors and bringing abort the urban functions Based on the principles of ecology and ecological engineering, as well as the "4R" rules, this pa- per illustrates the functions of the be ecological flows, and discusses how to improve the efficiency and to guarantee the fluency of the ecological flows so as to realize the sustainable development of urban ecosystem.更多还原