摘要
通过对不同水分和氮素水平下不同类型水稻品种叶鞘和节间伸长过程的连续观测和定量分析,构建了水稻主茎和分蘖叶鞘与节间生长的模拟模型。采用Logistic方程描述了主茎和分蘖叶鞘及节间的动态伸长过程;基于同伸叶鞘间的关系用二次曲线描述了分蘖叶鞘长度的变化;基于节间长度与直径的线性关系描述了节间直径的变化。另外,用叶片含水量和含氮量描述了不同水分和氮素水平对叶鞘和节间生长的影响。利用独立的水稻田间试验资料对所建模型进行了测试和检验,结果显示,主茎和分蘖叶鞘(一级分蘖和二级分蘖)长度模拟值的根均方差(RMSE)分别为0.65、0.52和0.46 cm;节间长度和直径模拟值的RMSE分别为0.42、0.15 cm。本模型具有较好的预测性,能定量描述不同品种和环境条件下水稻叶鞘和节间的动态伸长过程。
This study was conducted to build a dynamic simulation model on growth processes of leaf sheath and internode by making time-course observation and quantitative analysis of leaf sheath and internode growth at different leaf positions with the experiments of different varieties, Water regimes and nitrogen rates. The growth dynamics of leaf sheath and internode on main stem and tiller could be described with Logistic equation： the changes in leaf sheath length of tiller was described with quadratic equation based on the relationship of synchronous leaf sheaths, and the changes in internode diameter was described with linear equation on the relationship of length and diameter of internode. The effects of nitrogen and water conditions on leaf sheath and internode growth were quantified by the effectiveness values of nitrogen concentration and water content in leaf sheath and internode. The models were validated with the independent field experiment data involving different nitrogen rates. The root mean square error （RMSE） of leaf sheath length on the main stem, the primary tiller and the second tiller were 0. 65 cm, 0. 52 cm and 0.46 cm, respectively, and the RMSE of length and diameter of intemode were 0.42 cm and 0. 15 cm, respectively. The results indicated that the present models had a good performance in predicting morphological growth of leaf sheath and internode on main stem and tiller in rice plant.
出处
《南京农业大学学报》
CAS
CSCD
北大核心
2008年第3期19-25,共7页
Journal of Nanjing Agricultural University
基金
国家863计划项目(2007AA10Z225
2006AA10Z202
2006AA10Z219)
关键词
水稻
叶鞘
节间
模拟模型
rice
leaf sheath
internode
simulation model
