水稻叶片伸长过程的模拟模型  

A Simulation Model of Leaf Elongation Process in Rice

作　　者：常丽英[1] 顾东祥[1] 张文宇[1] 杨杰[1] 曹卫星[1] 朱艳[1] 

机构地区：[1]南京农业大学/江苏省信息农业高技术研究重点实验室,江苏南京210095

出　　处：《作物学报》2008年第2期311-317,共7页Acta Agronomica Sinica

基　　金：国家高技术研究发展计划(863计划)项目(2003AA209030);江苏省高技术研究项目(BG2004320)

摘　　要：水稻叶片生长过程的动态模拟,对于实现水稻生长的数字化和可视化表达具有重要的理论意义和应用价值。本研究以4个不同株型的水稻品种为试验材料,通过对水分试验、氮素试验条件下不同叶位叶片的叶长、叶宽特征进行连续观测,综合分析了水稻叶片几何形态指标随生育进程和环境条件的变化规律,进而构建了水稻叶片生长过程的动态模拟模型。模型采用Logistic方程描述了水稻主茎及分蘖叶片随生长度日(GDD)的动态伸长过程;利用二次曲线描述了叶宽随GDD的动态变化过程;分别用幂函数和一元二次方程描述了叶形(不同叶长处的叶宽)的动态变化过程;另外,以叶片氮素和水分因子分别描述了不同水氮水平对叶片形态建成过程的定量影响。同时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,主茎和分蘖动态变化叶长、叶宽的均方根差(RMSE)分别为3.6cm、3.96cm以及3.15cm、3.56cm。表明本模型对水稻叶片的动态伸长过程具有较好的预测性和解释性。Modeling leaf growth dynamics in rice is of significant importance for realizing virtual and digital plant growth. Based on time-course observations on leaf morphological properties （leaf length and leaf width） on main stems and tillers under different nitrogen rates and water regimes with four rice cultivars, the change patterns of leaf morphology with growth progress and envi- ronmental factors were characterized, and a dynamic model was developed to simulate time-course growth characters of different leaves on rice plant. The growth dynamics of leaf length on stem and tiller could be described with a logistic model, leaf width with conic equation, and leaf shape with exponential function and quadratic equation. The effects of nitrogen and water conditions on leaf growth were quantified by the effective values of leaf nitrogen concentration and water content. The model was validated with independent field experiment data of different nitrogen rates, and the mean RMSEs of dynamic leaf length were 3.60 cm and 3.96 cm, those of leaf width were 3.15 cm and 3.56 cm on main stem and tillers, respectively. The results indicated that the present model had a good performance in predicting morphological growth of leaf on stem and tiller in rice plant.

关 键 词：水稻 叶长 叶宽 叶型 动态 模拟模型 

分 类 号：S511[农业科学—作物学] X16[环境科学与工程—环境科学]