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基于不同株型品种和不同密度处理的小麦田间试验,连续观察并记录各处理不同叶位叶鞘与主茎之间的夹角,进一步利用系统分析方法和动态建模技术,构建基于过程的小麦叶片茎鞘夹角的动态模拟模型.结果表明:小麦茎鞘夹角随叶片生育进程不断加大,并随密度的增大而减小;从第2叶开始,最大茎鞘夹角随叶位的增加而减小.所建模型利用Logistic方程描述叶片茎鞘夹角随生育进程的动态变化过程,使用分段函数描述最大茎鞘夹角随叶位的动态变化,引入品种参数(第2叶茎鞘夹角的最大值)量化了茎鞘夹角在不同品种之间的差异,并利用基本苗量化了密度对茎鞘夹角的影响.基于独立的田间试验资料对所建模型进行测试与检验,结果显示茎鞘夹角模拟值与观测值之间的均方根差为1.7°.表明模型对小麦主茎叶片茎鞘夹角的动态变化过程具有较好的预测性,为小麦生长过程的可视化表达奠定了技术基础.
Based on field experiments of wheat with different plant types and different densities, the angle between leaf sheaths and main stems at different leaf positions was continuously observed and recorded. By using systematic analysis and dynamic modeling techniques, the process-based wheat leaves The results showed that the angle between the stem and sheath of wheat increased with the growth of leaves and decreased with the increase of density. From the second leaf, And the logarithm of the maximum angle of the stems and sheaths with leaf position was described by the piecewise function.The Logistic equation was used to describe the dynamic process of the angle between the stems and sheaths of the leaves with the growth process, The maximum value of sheath angle) quantified the difference of the angle between stems and sheaths in different varieties, and used the basic seedlings to quantify the effect of density on the angle between stems and sheaths.The model was tested and tested based on independent field data The results showed that the root mean square error between simulated and observed values of the angle between the stems and sheaths was 1.7 °, indicating that the model had a good predictive value for the dynamics of the angle between the stems and sheaths of the main stems of wheat, Visualization technology laid the foundation.