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本文应用Ｍｉｃｒｏｌｙｓｉｍｅｔｅｒ现场原位测定土面蒸发，以此为上边界条件，运用土壤动力学原理，提出了一种新的模拟根系吸水速率Ｓ（ｚ，ｔ）的方法，该方法与所选取的平均时段δｔ密切相关，研究表明：在冬小麦蒸腾速率较弱的前期及较强的后期，分别选取δｔ＝１０ｄ，５ｄ模拟Ｓ（ｚ，ｔ）可以获得较好的结果，分析冬小麦根系吸水速率的模拟结果可知：冬小麦根系吸水在灌浆－乳熟期达最高峰；若近地表水分充足，则吸水高峰出现在土壤上部，否则根系下扎，吸水高峰随之下移．
In this paper, the on-site determination of soil surface evaporation by Microlysimeter was used as the upper boundary condition, and a new method to simulate the root water uptake rate S (z, t) was proposed by using the soil dynamics principle. The method was compared with the selected average The results showed that δt = 10d and 5d simulated S (z, t), respectively, could obtain better results. The simulation of root water uptake rate of winter wheat The results showed that the root water uptake in winter wheat peaked at grain filling and milking stage. If the near surface water was sufficient, the peak of water absorption occurred in the upper part of the soil, otherwise the roots would plunge down and the peak of water absorption would decrease.