Plant’s sending out, evaporation from water surface and soil evaporation, these three components make up the ways of land surface evaporation. The overall average quantity of land surface evaporation is up to 378.4 mm, with a proportion of 74% of rainfall, which indeed accounts for a large percent. The total surface evaporation is between 300mm to 500mm, among them, North of Daxinganling Mountains reaches below 300mm as a low area while more than 400mm in Liaohe Plain as a high area.
Evaporation from water surface is considered to be the evaporation of large water bodies. According to different regions, average evaporation changes from 500mm to 1200mm. In the middle and low reaches of Wusuli River, as well as most mountains, which include Daxinganling Mountains, Xiaoxinganling Mountains, Zhangguangcai Mountain, Changbai Mountain, the amount of evaporation is less than 600mm averagely, Taiping station at the left banner of erguana, owns the minimum average measured data, only 429.7mm over many years. Plateau and plain areas as the rain-heavy regions, have the evaporation of over 1000mm, they are mainly located in the areas of the Karakqinqi, Yixian county, Asaoku, Faqu, the west of the Fudedian, and the south of Heilongjiang province, during which, Kailu station stands at 1222mm. as for the middle belt of 500mm to 1000mm, they are most of area of Liaohe Plain, Sonnen Plain and Sanjiang Plain and numerous of the hills.
Minimum amount of evaporation takes place in January and maximum in May, which makes up 14% to 19% of the whole year. Owing to the maximal evaporation month is at little rain season when crops are just growing, this will always bring in large range spring drought.
The information is provided from Disaster Risk Reduction Knowledge Service.
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