Study On Above Ground Plant Morphological Model And Visualization In Rice Based On Biomass

Virtual crop is the computer simulation of crop morphological structure and process of growth in three-dimensional space, which is an important tool for botanist to study. It is one aspect of the computer technology applications in agriculture, and also a new method in crop cultivation, crop physiology and ecology, and crop breeding. Virtual crop can promote people's understanding and perception of the process in crop growth, which can provide technical support for analyzing of the relationship between structure and function of crop, designing ideotype, and controlling and regulating the growth mode. On the basis of system analysis and experimentation, the objective of this study was to develop morphological model on organ based on biomass by coupling outputs of rice growth model, and to lay foundation for coupling the crop growth model and morphological model, and for setting up functional structure rice model.Based on the experiment observations, the change in leaf angle and the relationships between the tiller leaf blade length and its synchronously emerging leaf blade length on main stem, and between leaf blade length and its width, and changes in specific leaf weight (SLW) with leaf position (LP) were quantified, respectively. The results showed that the leaf angle changed in four stages with development of leaf age, and the relationship between leaf blade length and its width could be expressed in power function; the change of SLW with LP could be expressed in quadratic equation. Then, through coupling with simulation models of SLW, a general model for predicting geometrical parameters of rice leaf blade was developed, and the RMSE of leaf length and leaf width is 2.55cm,0.06cm, respectively.On the basis of the field experiment, the change characteristics of internodes length with internode position and the changes in the length of leaf sheath with leaf position on main stem were analyzed. The result showed that the relative internode length could be expressed in power function. Then, combined with outputs of biomass of growth model, the morphological models on leaf sheath and internode were developed based on biomass, and the model were validated with some independent experiment data, the RMSE of leaf sheath length and internode length is 1.82cm,3.35cm, respectively.Based on field experiments under different nitrogen rates and density with four cultivars, the quantitative characteristics of panicle architecture were analyzed. The results showed that the ratio of length of primary branch to that of panicle could be characterized by a quadratic equation in terms of nodal position of branch on panicle axis. The number of secondary branch changed linearly with the length of primary branch. Primary branch lied uniformly on panicle axis and internodal length of primary and secondary branch also had no significant change. In addition, the output of grain number per panicle of growth model and the number of primary branch were utilized to analyze the number of secondary branch.Finally, L-studio was introduced and exampled on plant architecture modeling with rice. Combining architecture characteristics of rice organs, the visualization of leaf blade was realized.