...城市化过程；河道生态系统；人为干扰；生态系统健康；环境影响； [gap=1489]Key words: urbanization；river-course ecosystem；human disturbance；ecosystem health；environmental effect； ..
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Taking the abandoned delta of Huanghe River as a case, this paper analyzed the natural and artificial driving forces of ecosystem degeneration, with the degeneration course investigated.
本文以废黄河三角洲为例，分析了废黄河三角洲生态系统退化的自然和人为应力以及生态系统的退化过程。
The paper puts forward and calculates the lowest environmental water demand in river course of stem stream according to the features of ecosystem and environment of lower reach of Yangtze River.
依据长江下游生态环境特点提出并概算了长江下游干流河道内最小环境需水量。
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