[目的]植物功能-结构模型(functional-structural models,FSPM)是研究植物生理生态与形态结构相互反馈生长过程的有效工具。量化植株器官干质量与观赏植物外观品质的关系,不仅可以将生长模型和3D结构模型联系起来,而且使外观品质的预测更具机理性、普适性。[方法]以一品红‘中国红’(Euphorbia pulcherrima Willd‘Red China’)为试验材料,根据不同定植期(2007年7月12日、10月12日和10月30日)和不同摆放密度(16.00、11.10和8.16株？m-2)的温室盆栽试验,定量模拟分析一品红器官干质量与外观品质的关系,并用独立的试验数据进行检验。[结果]一品红冠幅、展叶数、株高、主茎粗、冠高比和花幅等外观品质指标的预测效果较好,预测值与实测值之间基于1:1线的决定系数(coefficient of determination,R2)分别为0.97、0.96、0.96、0.93、0.94和0.96,相对回归估计标准误(relative root mean squared error,rRMSE)分别为5.07%、9.16%、6.26%、5.62%、3.70%和10.60%。[结论]本研究为进一步建立温室盆栽一品红的功能-结构模型奠定了基础。[Objectives]Functional-structural models(FSPM)are models describing the development of the structure of plant as governed by physiological processes, which can be a valuable tool for examining how physiology and morphology interact in determining plant processes. However, the output of process-based crop growth model is organ dry weight, which cannot be used directly to simulate the change of the organ structure. The aim of this study was to quantify the relationship between organ dry weight and external quality traits of ornamental plants, so as to link the output of crop growth model to the input of structural model, which was an important step for developing a functional-structural model. [Methods]For this purpose, three experiments with different planting dates(July 12, 2007;October 12, 2007;October 30, 2007)and densities(16.00, 11.10 and 8.16 plant？m-2)were conducted in a multi-span Venlo type greenhouse of Nanjing(32°N, 118°E)from July 2007 to April 2008. The cultivar used in the experiments was Euphorbia pulcherrima Willd‘Red China’ which is one of the main greenhouse pot flowers in the world and the most popular festival flowers in China. The plot with 50 plants for each density treatment with three replicas was arranged in a randomized block design. In all experiments, 3 plants of each plot(9 plants per treatment)were randomly selected for non-destructive external quality measurements once every 7 days after planting. The non-destructive measurements include canopy diameter(Cd), leaf number(N), plant height(H), diameter of the main stem(Dst), ratio of canopy diameter to plant height(Rdh)and diameter of flower canopy(Cdf). One plant of each plot(3 plants per treatment)was randomly selected for destructive measurements once every development stage after planting. The destructive measurements include leaf dry weight(Wlv), stem dry weight(Wst)and bract dry weight per plant(Wbr). The relationship between organ dry weight and external quality of pot planted poinsettia was quantified based on
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