不同氮素水平下辣椒叶面积指数动态模型  

Dynamic simulation of leaf area index of pepper under different nitrogen levels

作　　者：岳延滨[1] 黎瑞君[1] 冯恩英 李莉婕[1,2] 彭顺正 孙长青 YUE Yanbin;LI Ruijun;FENG Enying;LI Lijie;PENG Shunzheng;SUN Changqing(Guizhou Agricultural Science and Technology Information Institute,Guiyang 550006,China;College of Resources and Environment,Southwest University,Chongqing 400716,China)

机构地区：[1]贵州省农业科技信息研究所,贵阳550006 [2]西南大学资源环境学院,重庆400716

出　　处：《中国农业大学学报》2022年第5期157-168,共12页Journal of China Agricultural University

基　　金：贵州省科技支撑计划项目(黔科合支撑[2021]一般173);国家自然科学基金项目(31560338,31360290)。

摘　　要：为给辣椒生产中氮素优化管理提供理论依据,选用3个辣椒品种(‘黔辣10号’‘黔椒5号’‘中椒6号’)基于5个氮素水平(N0~N4:0.00、51.75、103.50、155.25和241.50kg/hm^(2))小区试验数据,定量分析了不同氮素水平下辣椒叶面积指数与生理发育时间的动态变化,构建了辣椒叶面积指数动态变化模型,并量化了模型参数与氮素水平间定量关系。结果表明:1)辣椒叶面积指数随生理发育时间呈单峰曲线变化,随氮素水平提高先上升后降低。辣椒叶面积指数变化速率随生理发育时间整体呈单峰曲线变化;2)采用分段函数模拟辣椒叶面积指数动态变化,检验结果显示:决定系数R^(2)均在0.95以上,相对根均方差(RRMSE)均<20%,模拟效果较好;3)模型参数PDT_(half)表征叶面积指数峰值出现的时间顺序,与氮素水平呈线性正相关,其余参数与氮素水平呈二次回归函数关系;4)辣椒最大叶面积指数和平均叶面积指数随氮素水平提高呈先上升后降低趋势。本研究构建的辣椒叶面积指数动态模型预测效果较好,具有更强的生物学意义和一定的实用性,可为辣椒优质高产栽培提供理论基础。To provide theoretical basis for the optimal management of nitrogen in pepper production,the dynamic changes in pepper LAI(leaf aera index)and PDT(physiological development time)under different nitrogen levels were quantitatively analyzed based on the plot experiments.Three varieties(‘Qianla10’‘Qianjiao 5’‘Zhongjiao 6’)were used and five nitrogen levels(N0-N4:0.00,51.75,103.50,155.25 and 241.50kg/hm^(2))were set.A dynamic change model for pepper LAI was constructed,and the relationship between the model parameters and nitrogen level was quantified.The results showed that:1)Pepper LAI showed a unimodal curve variation with PDT,and it increased first and then decreased with the rise of nitrogen level.The velocity of pepper LAI showed a unimodal curve as a whole with the accumulation of PDT.2)The dynamic change of pepper LAI was simulated by subsection function.The model test demonstrated that the determination coefficient R^(2) was all above 0.95 and RRMSE was all less than 20%,which indicated that the simulation effect was good.3)PDT_(half) showed the time sequence of LAI peak demonstrated linear positive correlation with nitrogen level,and the other parameters showed quadratic correlation regression function.4)The maximum and mean of pepper LAI increased first and then decreased with the increasing nitrogen level.In conclusion,the model constructed in this study has better prediction function,stronger biological significance and certain practicability.This model can provide a theoretical basis for high-quality and high-yield cultivation of pepper.

关 键 词：辣椒 叶面积指数 氮素水平 生理发育时间 模型 

分 类 号：S641.3[农业科学—蔬菜学]