基于概念模型的麦田土壤水分动态模拟研究

农田土壤水分模拟是农业用水管理的重要依据。以根区土体水量平衡方程为依据,考虑根区下界面水分通量,构建了农田土壤水分变化模拟模型,该模型由作物蒸散量模型、根区下界面水分通量模型以及水量平衡方程等组成。采用山西水利职业技术学院试验基地2007年和2008年2个年度冬小麦试验资料,确定了模型参数。结果表明,土壤储水量模拟计算值与实测值有较好的一致性,其相关系数达到0.9555;F检验结果达到极显著水平,所建立的麦田土壤水分动态模型可用于作物蒸散量、根区下界面水分通量和田间土壤水分的模拟计算;计算精度平均达到3%～11%。表明该模型可较好地描述农田士壤水分转化过程。

Simulation of Dynamic Soil Moisture of Winter Wheat Based on Conceptual Model

Simulation of dynamic soil moisture in farmland is the important basis of agricultural water management. Based on the water balance equation of root zone, and taking the lower boundary water flux of root zone into account, a farmland soil moisture simulation model was set up, in cluding crop evapotranspiration model, lower boundary water flux model and water balance equation. The parameters of the model were fixed by the observation data of soil moisture through the winter wheat growing season in the irrigation experimental base of Shanxi Technical College of Water Conservancy in 2007 and 2008. The soil moisture simulated by the model agreed well with the measured ones, the multiple correlation coefficient reached 0.9555; and the F test reached extremely significance level. The established farmland soil moisture simulation model can be used to calculate crop evapotranspiration, lower boundary water flux in root zone and field soil moisture; and the mean calculation precision can reach 3%-11%.The result shows that the model deals well with the field soil water transform process.