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根据额济纳荒漠河岸胡杨林的实际土壤层结构,建立了带有根系吸水项的垂向一维土壤水分非饱和运动基本方程,并采用有限差分法对蒸发条件下土壤水分运动方程进行离散化,编制了用于该模型数值模拟的计算程序。最后通过数值模拟对模型进行验证,结果表明,模拟值与实测值能够较好吻合,模拟精度在92%~98%之间,能较好地反映土壤水分的运动规律,为研究土壤-植被-大气连续体(SPAC)水分运移提供理论基础。
According to the actual soil layer structure of Populus euphratica forest in the Ejin Desert, the vertical one-dimensional soil moisture unsaturated movement basic equation with root water absorption is established and the equation of soil moisture movement under the evaporation condition is discretized by finite difference method. Calculation program for numerical simulation of the model. Finally, the model is validated by numerical simulation. The results show that the simulated values can be in good agreement with the measured values, the accuracy of the simulation is between 92% and 98%, which can well reflect the movement law of soil moisture. Atmospheric continuum (SPAC) provides a theoretical basis for water transport.