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本文根据蒸发与蒸发力、土壤储水量间的函数关系,提出一个利用蒸发力进行灌溉预报的方法.该方法是按蒸发第一阶段E=E_0和蒸发第二阶段W-W_0/W_H-W_0=e~(-b∑E_0)两方程拟订的. 利用上述方程,只要具有下述资料:(1)初始有效土壤储水量(W_H-W_0);(2)预报时期内蒸发力∑E_0;(3)经验系数b便可进行灌溉预报. 据实验资料,已求得华北地区经验系数b=0.00614,并得经验方程: W-W_0/W_H-W_0=e~(-0.00614∑E_0). 文中还确定华北地区暖季月分农田蒸发力经验值.
According to the relationship between evaporation and evaporation and soil water storage, a method of using irrigation force to predict irrigation is proposed in this paper, which is based on the first stage of evaporation E = E_0 and the second stage of evaporation W-W_0 / W_H-W_0 = e ~ (-bΣE_0). Using the above equation, as long as the following data are available: (1) Initial effective soil water storage (W_H-W_0); (2) Evaporation force ΣE_0 during the forecast period; ) Empirical coefficient b can be used for irrigation forecasting.According to the experimental data, the empirical coefficient of North China b = 0.00614 has been obtained and the empirical equation: W-W_0 / W_H-W_0 = e ~ (-0.00614ΣE_0) Experience of Farmland Evaporation in Warm Season in North China.