土壤中水热运动耦合方程预报模型研究

在土壤中热运动耦合方程模拟模型的基础上，对作物根系吸水函数进行改进，提出一个仅与降水、作物发育期和叶面积有关的新的根吸水函数表达式，从而建立土壤水分的预报模型。模型只需输入气象变量、土壤温度、土壤水文学参量及作物发育期等常规资料，即可对冬小麦田土壤水分状况进行预报，预报值与实测值的平均最大相对误差在8％以内。

AN IMPROVED VERSION EQUATIONS COUPLING MODEL FOR WATER AND HEAT TRANSFER IN CROPPED SOIL

On the basis of the equations coupling model for water/hear transfer in cropped soil,improvement is made on the water-uptake-by-root function(WURF),leading to a version that is related only to precipitation,crop development period a nd leaf area index as the affecting factors whereby a new model of soil water prediction is established.Thus,only with conventional meteorological variables,soil temperature,soil hydrological parameters and crop growth stage fed into the model,can prediction be satisfactorily performed of soil water regime in winter wheatfields, with the maximum relative error averaging within 8%.