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在土壤剖面的水势梯度等于零时的深度为土壤水分零通量面,以此推求土壤蒸发量.利用负压计在田间测定土壤水势,利用中子水分探测仪可逐层测定土壤含水量.在山东禹城综试站小麦田进行实测,按θ=(0.867R/RW)-0.016式计算含水量;将土壤总水势绘成水势剖面图识别零通integral from i=1 to x=10〔(θ_i(t_1)-θ_i(t_2)〕换算求出蒸发量.初步证实用此法计算土壤蒸发量行之有效.
In the soil profile when the water potential gradient is equal to zero zero depth of soil moisture flux in order to infer the amount of soil evaporation using negative pressure gauge in the field to measure soil water potential, neutron moisture detector layer by layer can be measured soil moisture. Shandong Yucheng test station wheat field measured, according to θ = (0.867R / RW) -0.016 formula to calculate the water content; the total soil water potential is plotted as a water potential profile to identify zero-pass integral from i = 1 to x = 10 [( θ_i (t_1) -θ_i (t_2)] is calculated and the result shows that it is effective to calculate the soil evaporation by this method.