根据降水变化可分为三个多雨期和三个少雨期。
With the change of precipitation, it divided three pluvial periods and three dry periods.
研究结果表明，沼泽湿地蒸发量在夏季少雨期高于农田，秋季多雨期低于农田；
The result shows that during rainless summer evaporation of wetland is higher than that of farmland, but during rainy autumn is lower than that of farmland.
北区年降水量变化较小。青藏高原降水量在1978年由少雨期转为多雨期，青藏高原夏季降水与孟加拉湾的水汽输送及副高的水汽输送关系密切。
And we find that the precipitation was catastrophe in 1978. The water vapor of the Bengal Gulf and subtropical high was related to the Plateau summer rainfall.
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