紫花苜蓿株高和叶面积指数变化动态及模拟模型

Dynamic changes and simulation model of plant height and leaf area index of alfalfa

苜蓿的株高和叶面积是反映其产量高低的特征量。为推进虚拟草业的牧草模型技术发展,文中在田间试验的基础上,分别以播后天数和有效积温为自变量,通过对苜蓿的株高和叶片的生长数据进行定量分析,采用logistic函数对二者的变化动态进行建模,并对模型的稳定性和适应性进行了全面的验证。结果表明:模型的模拟值与实测值误差小,能够较好的反映常规栽培条件下苜蓿株高和叶片的生长发育状况。

Alfalfa＇s height and leaf area are the characteristic value to reflect its yield.For more intuitive virtual pratacultural development,this paper presents a modeling simulation based on days after sowing and accumulated temperature respectively for plant height and the leavef growth process of the alfalfa with the logistic function dynamic model,through the field experiment of alfalfa and growth data quantitative analysis.the model validation was carried out for the model stability and adaptability comprehensively.The results show that the model simulation values are harmony with the actual measured data,indicating that the model can lighly refcect the plant height,leaf area of the alfalfa under conventional culture condition.