水稻主茎出叶动态模拟研究

 【目的】研究水稻主茎各叶片出伸与有效积温的关系，建立水稻主茎出叶与有效积温关系的动态模拟模型。【方法】选用16个水稻品种分别在云南丽江、江苏南京两个生态地区进行播期试验，观察主茎各叶片出伸与有效积温的定量关系。【结果】主茎叶片出伸所需有效积温与叶位的关系总体随叶位的上升而增加，且在整个叶龄进程中出现两个拐点，第一个拐点出现在第3叶龄期，第二个拐点出现在第N-n-2叶龄期。据此，对叶龄进程进行分段模拟，建立叶龄模型。利用不同环境下播期试验的出叶动态数据对模型进行检验，不同类型品种模拟叶龄与实测叶龄的根均方差（RMSE）都小于0.1。【结论】以各叶位叶片出伸与有效积温的关系建立的叶龄分段函数模型具有较好的预测性和实用性。

A Simulation Model of Leaf Appearance on Main Stem of Rice

【Objective】 This study was conducted to investigate the relationship between leaf position on the stem of rice cultivar and effective accumulated temperature and to describe the progress of leaf appearance on main stem of rice. 【Method】 Sixteen rice cultivars were used in this experiment. They were planted with different sowing dates in Nanjing, Jiangsu and Lijiang, Yunnan. The relationship between leaf position on the stem of cultivar and effective accumulated temperature was observed. 【Result】 The results indicated that the leaf within one stem appeared more later it would need more effective accumulated temperature. Moreover, there were two turning points during rice growth period. One appeared when leaf number was 3 and the other one emerged while leaf number equaled N-n-2. Therefore, the piecewise function was used to describe the progress of leaf appearance on main stem of rice. Data collected from two regions were used to validate the model. The RMSE between simulated values and measured values were less than 0.1. 【Conclusion】 This study suggested that the model had good forecast ability and practicability for leaf appearance.