Hydraulic engineering is one of the stress factors to river ecosystem.

水利工程是对于河流生态系统胁迫因子之一。

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The concept and evaluation method of river ecosystem health were discussed.

探讨了河流生态系统健康的概念和评价方法。

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The growth and reproduction of phytoplankton are correlated with the remaining time in river ecosystem.

在河流生态系统中，浮游藻类的生长繁殖与在水体中的滞留时间有着特殊重要的关系。

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Each group should research the location of the river, its benefits to people and animals, the current condition of the river and the potential effects on the river's ecosystem and the local community if the river were to become contaminated.

CNN: Rivers feel heat as U.S. energy demand rises

After they moved into their own Monticello in 1991, the Kauffmans became enamored of the river's fragile ecosystem: the tidal marshes, the nesting osprey and the threatened native oyster beds.

FORBES: Ultradeductible