基于过程的小麦茎鞘夹角动态模拟  

Dynamic simulation of wheat stem-sheath angle based on process

作　　者：张文宇[1] 汤亮[1] 朱相成[1] 杨月[1] 曹卫星[1] 朱艳[1] 

机构地区：[1]南京农业大学国家信息农业工程技术中心/江苏省信息农业高技术研究重点实验室,南京210095

出　　处：《应用生态学报》2011年第7期1765-1770,共6页Chinese Journal of Applied Ecology

基　　金：教育部新世纪优秀人才支持计划项目(NCET-08-0797);国家自然科学基金项目(30800664);江苏省自然科学基金项目(BK2009307)资助

摘　　要：基于不同株型品种和不同密度处理的小麦田间试验,连续观察并记录各处理不同叶位叶鞘与主茎之间的夹角,进一步利用系统分析方法和动态建模技术,构建基于过程的小麦叶片茎鞘夹角的动态模拟模型.结果表明:小麦茎鞘夹角随叶片生育进程不断加大,并随密度的增大而减小;从第2叶开始,最大茎鞘夹角随叶位的增加而减小.所建模型利用Logistic方程描述叶片茎鞘夹角随生育进程的动态变化过程,使用分段函数描述最大茎鞘夹角随叶位的动态变化,引入品种参数(第2叶茎鞘夹角的最大值)量化了茎鞘夹角在不同品种之间的差异,并利用基本苗量化了密度对茎鞘夹角的影响.基于独立的田间试验资料对所建模型进行测试与检验,结果显示茎鞘夹角模拟值与观测值之间的均方根差为1.7°.表明模型对小麦主茎叶片茎鞘夹角的动态变化过程具有较好的预测性,为小麦生长过程的可视化表达奠定了技术基础.Based on the field experiments with different plant-type wheat（Triticum aestivum） cultivars and varied population densities,the time-course changes in the angle between stem and sheath（stem-sheath angle） on main stem were observed,and a process-based model was developed for simulating the growth dynamics of stem-sheath angle on the main stem by using system analysis method and dynamic modeling technology.The stem-sheath angle increased with the growth of corresponding leaves,and decreased with increasing population density.The maximum stem-sheath angle decreased with increasing leaf position,except for the first leaf on main stem.The growth dynamics of stem-sheath angle could be described with Logistic equation,and the changes in the maximum stem-sheath angle with leaf position could be quantified with two different equations.The maximal value of stem-sheath angle at the second leaf position was considered as the cultivar parameter to reflect the genetic differences,and the plant number per unit area was used to quantify the effects of population density.The independent field experiment dataset of different wheat cultivars was used to test the model,and the average RMSE between estimated and observed values was 1.7°,suggesting that the present model had good performance and reliability on predicting the growth dynamics of wheat stem-sheath angle,and provided a key module for wheat plant-type simulation and visualization.

关 键 词：小麦 茎鞘夹角 模拟模型 

分 类 号：S512.1[农业科学—作物学]