关键词: 冬小麦, 有效积温, 叶片高度模型, 三维可视化

Abstract: Crop growth simulation model has important guiding roles in managing crop growth, forecasting crop yield and analyzing economic benefit. The morphological structure model can provide powerful technical support for screening ideal crop plant type, achieving high yield, and efficiently resisting lodging, etc.. Since wheat morphological structure is complex and wheat growth visualization is difficult to realize, this study took wheat varieties Hengguan 35, Jimai 22 and Heng 4399 as experimental materials, and carried out field experiments with different varieties and nitrogen levels in Wuqing district of Tianjin. The height morphological data of wheat leaf were collected, quantitative relationship between leaf height and effective accumulated temperature of various winter wheat varieties were analyzed. Then a simulation model of winter wheat leaf height at different locations was constructed using logistic equation. Simulation model was validated by independent experiment dataset. The results showed that the absolute error was between 0.01~2.82 cm, and RMSE was between 0.32~1.52 cm. It indicated that simulation model had high precision, and this model had better predicting ability for the growth of different winter wheat varieties. With the help of simulation model and existing research findings, this study constructed the plant morphology of different winter wheat varieties under different nitrogen levels, realized the combination of wheat growth simulation model and morphological structure model, and realistically simulated the dynamic growth process of winter wheat. Thus, the growth visualization of different winter wheat varieties under different nitrogen levels was realized.

Key words: winter wheat, effective accumulated temperature, leaf height model, 3D visualization