内陆水体生态系统在维持全球物质循环和水分循环中具有重要作用。
The terrestrial aquatic ecosystems play an important role in sustaining global matter and water cycle.
主要生物控制作用包括，一方面促进水体生态系统的物质循环和能量流动，加速营养元素沉降或脱离水生生态系统；
The main biological role include, 1) promoting water ecosystems material circulation, energy flowing and speed up the settlement of nutrients from aquatic ecosystems;
水体底泥？(沉积物)是河流、湖泊等自然水体生态系统的重要组成部分，也是水体生态系统物质循环中的一个重要环节。
Water sediment (sediment) is an important part of the rivers, lakes and other natural water ecosystems, and it's also a significant integral link of material cycle in water ecosystem.
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