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1 前言 河道是个重要的生态系统,自然、绿色、生态平衡的河道生态系统,不仅为生物多样性提供了前提,且提高了水体的纳污和自净能力。同时,自然平衡必将大大降低人工管理维护的成本。从城市生态学的观点来看,生态丰富的河道系统的重要功能之一,就是把城市的绿色孤岛连起来,并延伸到远郊,使城乡的绿色生态系统成为一个整体,给人以回归自然的感觉。
1 Introduction Rivers are important ecosystems. Natural, green and ecologically balanced river ecosystems not only provide the precondition for biodiversity, but also improve the water holding capacity and self-purification. At the same time, the natural balance will greatly reduce the cost of manual management and maintenance. From the standpoint of urban ecology, one of the important functions of an ecologically-rich river system is to connect the city’s green islands to the outer suburbs and to integrate the urban and rural green ecosystems as a whole, giving people a chance to return to nature feel.