水库消落区又称涨落带或涨落区，是水库季节性水位涨落而使周边被淹没土地周期性地出露于水面的一段特殊区域。是水生生态系统和陆生生态系统交替控制的过渡地带，是一类特殊的湿地生态系统。
综合开发、利用消落区土地，必须服从水库运行的统一调度和管理。
The comprehensive development of the land must be subordinated to unified control and management of the reservoir operation.
三峡水库建成后，由于水库调度引起库水位周期性的涨落，在库区两岸形成周期性变化的水陆交错区域即消落区。
After the Three-Gorges reservoir was put into use, riparian zones have been formed on both sides of the reservoir where the water level changes periodically.
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