然后，雨水回到海洋，湖泊，河流和植物中，整个循环又重新开始。
The rain then falls back into the oceans, lakes, rivers and plants, and it starts all over again.
对邻近河流树木的采伐也会增加河流中的沉淀和污浊度，降低水质和退化河岸动植物栖息地。
Harvesting adjacent to streams can increase sedimentation and turbidity in streams, lowering water quality and degrading riparian habitat.
结果表明：1）含植物河流中的流速垂线分布呈三区，从下至上分别为冠层区、过渡区和冠层以上区；
Results show: 1) the vertical profiles of the flow velocities exhibit three zones, the within-canopy, the transitional and the above-canopy zones;
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