There are 9 changes of the water level of the Muneng nur lake totally during 1544-1960. We can divided the 416 years into 9 stages with higher 5 water levels of stages which represent larger flux and relative humid clamite periods of the blacj river.

• 在约公元1544到1960年间的这400多年中木能诺尔的水位共发生了9次较大的变化，由此可以把额济纳绿洲这416年来的环境演变分为9个阶段，其中有5个阶段的水位较高，代表了黑河径流较大，气候相对比较湿润；