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作物根系吸水受多种因素影响,笔者在前人研究的基础上,从根系自身生物量变化的角度,依据土壤水动力学原理,构建以根重为因变量的根系吸水模型。采用均方根误差(RMSE)和平均绝对百分误差(MAPE)2个评价指标对模型进行检验和评价。结果表明,RMSE全年统计的变化范围0.477~1.231,MAPE全年统计的变化范围1.082%~4.052%,平均RMSE为0.810,平均MAPE为2.520%,模拟精度基本满足要求。说明建立的根系吸水数值模型及编写的程序具有较高的模拟精度,能够较好地模拟自然条件下作物生长期间的土壤水分动态变化。
Based on the previous studies, based on the changes of the biomass of the root system, the author constructed a root water absorption model with root weight as the dependent variable based on the principle of soil hydrodynamics. The model was tested and evaluated using two evaluation indexes: root mean square error (RMSE) and mean absolute percentage error (MAPE). The results show that RMSE annual statistics range from 0.477 to 1.231, MAPE annual range from 1.082% to 4.052%. The average RMSE is 0.810 and the average MAPE is 2.520%. The simulation accuracy basically meets the requirements. The results show that the established numerical model of root water uptake and the programmed program have higher simulation accuracy and can better simulate the dynamic changes of soil moisture during crop growth under natural conditions.