作物根系吸水率模型的试验研究

The Experimental Study of the Model for Water Uptake by Roots in Crop

以土壤水动力学理论为基础 ,通过取土水洗法测定了有效根量 ,考虑了目前大多用一维根系吸水率模型而忽视的一些因素 ,建立了有效根量密度分布函数。由理论分析和计算 ,得到了较为切合实际的二维根系吸水率模型。

Distribution of effective roots in soil in summer corn was measured with washing soil samples taken from root zone at different growth stages. Based on the experimental results and on theory of soil water dynamics, a root density distribution function, considering some factors which are neglected by most of existed one dimensional root water uptake models, was developed. Through theoretical analysis and numerical computation, a two dimensional root water uptake model then was developed. Results of case study shown that the two dimensional model are more suitable for practice.