小麦根系长度的估算方法与参数分析

构建小麦根系伸长过程的动态模型，并对模型参数进行定量分析，可为植株形态建成模拟和可视化显示提供关键技术。根据根系生长发育的基本结构单元，利用根系与地上部叶片生长之间的同伸关系，以生长度日为时间尺度，建立了小麦初生根、节根与分枝根发生过程的模型；通过计算不同类型根系的生理年龄，建立了不同类型根系发育阶段预测模型；以线性方程为基础，建立了不同类型根的伸长过程模型，并实现了对总根长变化过程的动态模拟。利用独立的试验资料对所建模型进行了检验，结果显示模型对小麦总根长和主轴数量的模拟值与观测值的均方根差分别为370.68 cm和1.27个，相对误差分别为0.27和0.16；对模型参数的灵敏性分析表明，模拟结果对参数变化的响应比较适中，可以较好地反映小麦根系长度和拓扑结构的动态变化过程。

Estimation method and parameter analysis on root length in wheat

Simulation model and parameter analysis on root elongation process in wheat would provide technical basis for quantifying morphological formation and visualization of crop plant. With growing degree-day as time scale, the generation processes of primary root system, nodal root system and root branches were simulated based on the basic root unit and the synchronous relationship between root and leaf growth. The model of root developmental stage was built by calculating physiological ages of different types of root. The elongation process and total length of root were modeled with linear equations. The models were tested with independent experimental data. The comparison between simulated and measured accumulated root length and root number showed that the values of root mean square error were 370.68 cm and 1.27, and the values of relative error were 0.27 and 0.16, respectively. Sensitivity analysis indicated that the parameter variations resulted in the modest changes in simulation results, and the model performed well in predicting the dynamic changes in total root length and topological of root structure in wheat.